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<h1 class="title">Intro to <code>tidycensus</code></h1>
<p class="subtitle lead">A workshop for EcoDataScience, UCSB</p>
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<div class="quarto-title-meta-heading">Author</div>
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<p>Camila Vargas Poulsen </p>
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<div class="quarto-title-meta-heading">Published</div>
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<p class="date">January 17, 2024</p>
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<div class="callout callout-style-default callout-note callout-titled">
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<p>This lesson is based on <a href="https://walker-data.com/census-r/">Analyzing US Census Data: Methods, Maps, and Models in R</a>, by Kyle Walker. And Walker’s workshop “Analyzing 2020 Census Data with R and tidycensus” for University of Michigan (2022). GitHub repository <a href="https://github.com/walkerke/umich-workshop-2022">here</a>.</p>
</div>
</div>
<section id="introduction" class="level2">
<h2 class="anchored" data-anchor-id="introduction">Introduction</h2>
<p>When working with census data, the general workflow would be to go to <a href="https://data.census.gov/">data.census.gov</a>, filter data and queries based on variables and geographies, and then download the data into a spreadsheet. People that work with census data do this over and over again.</p>
<p>The <code>tidycensus</code> package (Walker and Matt (2021)) was developed to systematize this process and do this systematization using R. In 2012 the US Census Bureau released the Census Application Programming Interface (API) as a way to disseminate government data resources to the public. This interface now provides programmatic access to hundreds of data resources from the Census Bureau. The vision behind this package was to incorporate the API access into an R package to facilitate access to census data using R.</p>
</section>
<section id="set-up" class="level2">
<h2 class="anchored" data-anchor-id="set-up">Set up</h2>
<div class="cell">
<div class="sourceCode cell-code" id="cb1"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(tidycensus)</span>
<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(dplyr)</span>
<span id="cb1-3"><a href="#cb1-3" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(tidyr)</span>
<span id="cb1-4"><a href="#cb1-4" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(ggplot2)</span>
<span id="cb1-5"><a href="#cb1-5" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(mapview)</span>
<span id="cb1-6"><a href="#cb1-6" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(sf)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<p>If you haven’t set your key into your R Environment run the following function and then restart R.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb2"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="fu">census_api_key</span>(<span class="st">"YOUR KEY GOES HERE"</span>, <span class="at">install =</span> <span class="cn">TRUE</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</section>
<section id="quering-data-focus-on-2020-decennial-data" class="level2">
<h2 class="anchored" data-anchor-id="quering-data-focus-on-2020-decennial-data">Quering data (focus on 2020 decennial data)</h2>
<ul>
<li>Total population for 2020 by state</li>
</ul>
<div class="cell">
<div class="sourceCode cell-code" id="cb3"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a>pop_2020 <span class="ot"><-</span> <span class="fu">get_decennial</span>(</span>
<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a> <span class="at">geography =</span> <span class="st">"state"</span>,</span>
<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a> <span class="at">variable =</span> <span class="st">"P1_001N"</span>,</span>
<span id="cb3-4"><a href="#cb3-4" aria-hidden="true" tabindex="-1"></a> <span class="at">year =</span> <span class="dv">2020</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<ul>
<li>Total population data for the <strong>2010</strong> decennial census by state</li>
</ul>
<div class="cell">
<div class="sourceCode cell-code" id="cb4"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a>pop_2010 <span class="ot"><-</span> <span class="fu">get_decennial</span>(</span>
<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a> <span class="at">geography =</span> <span class="st">"state"</span>, </span>
<span id="cb4-3"><a href="#cb4-3" aria-hidden="true" tabindex="-1"></a> <span class="at">variables =</span> <span class="st">"P001001"</span>,</span>
<span id="cb4-4"><a href="#cb4-4" aria-hidden="true" tabindex="-1"></a> <span class="at">year =</span> <span class="dv">2010</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<p><strong>Note:</strong> To get total population data for the 2010 decennial census the variable code is different than the 2020 census (even though the arguments of the functions are the same).</p>
<ul>
<li>Retrieving table P2 from 2020.</li>
</ul>
<p>Table P2 is one of the tables of the 2020 census, which provides counts by Race with Hispanic origins.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb5"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a>table_p2_2020 <span class="ot"><-</span> <span class="fu">get_decennial</span>(</span>
<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a> <span class="at">geography =</span> <span class="st">"state"</span>,</span>
<span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a> <span class="at">table =</span> <span class="st">"P2"</span>,</span>
<span id="cb5-4"><a href="#cb5-4" aria-hidden="true" tabindex="-1"></a> <span class="at">year =</span> <span class="dv">2020</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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<p>Let’s check which variables we have in the P2 table.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb6"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="fu">unique</span>(table_p2_2020<span class="sc">$</span>variable)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</section>
<section id="census-files-tables-and-variables" class="level2">
<h2 class="anchored" data-anchor-id="census-files-tables-and-variables">Census files, tables, and variables</h2>
<p>Let’s take a look on how this works. Data is released in files. Each file is a data product from the Census Bureau (find details of the Census data products here), for example, PL 94-171 is one of the files for the 2020 Decennial Census. Each of these files contains many tables (P1, P2 .. P5). Each table covers a specific topic. For example, P2 provides counts by race by Hispanic origins. Then each table has multiple variables. The variable code seems to, for the most part, start with the table code. For example, the unique codes values we printed from table P2 all start with P2_.</p>
<p>How do we navigate all these codes? There is no straightforward way. In part, this dilemma is part of working with census data, which in itself is complicated. However, <code>tidycensus</code> provides some help with a function called <code>load_variables()</code>.</p>
<p>This function scrapes the variables’ names from the census website and gives you a data frame that you can interact with. This variable requires you to input a year and a file name.</p>
<ul>
<li>Variable codes and definitions for the <strong>PL 94-171</strong> redistricting file</li>
</ul>
<div class="cell">
<div class="sourceCode cell-code" id="cb7"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a>vars_pl_2020 <span class="ot"><-</span> <span class="fu">load_variables</span>(<span class="dv">2020</span>, <span class="st">"pl"</span>)</span>
<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb7-3"><a href="#cb7-3" aria-hidden="true" tabindex="-1"></a><span class="do">## for 20210</span></span>
<span id="cb7-4"><a href="#cb7-4" aria-hidden="true" tabindex="-1"></a>vars_pl_2010 <span class="ot"><-</span> <span class="fu">load_variables</span>(<span class="dv">2010</span>, <span class="st">"pl"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<p>Another important file in the Decennial Census is the <em>Demographic and Housing Characteristics File (DHC)</em>. Similar to the code above, we can get all the variables and tables from this file by running:</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb8"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a>vars_dhc_2020 <span class="ot"><-</span> <span class="fu">load_variables</span>(<span class="dv">2020</span>, <span class="st">"dhc"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<p>To access a variable from a specific file you can use the argument <code>sumfile =</code> and specify the file.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb9"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a><span class="do">## Note you have to specify the file with sumfile =</span></span>
<span id="cb9-2"><a href="#cb9-2" aria-hidden="true" tabindex="-1"></a>household_2020 <span class="ot"><-</span> <span class="fu">get_decennial</span>(</span>
<span id="cb9-3"><a href="#cb9-3" aria-hidden="true" tabindex="-1"></a> <span class="at">geography =</span> <span class="st">"state"</span>,</span>
<span id="cb9-4"><a href="#cb9-4" aria-hidden="true" tabindex="-1"></a> <span class="at">variable =</span> <span class="st">"H10_001N"</span>,</span>
<span id="cb9-5"><a href="#cb9-5" aria-hidden="true" tabindex="-1"></a> <span class="at">year =</span> <span class="dv">2020</span>,</span>
<span id="cb9-6"><a href="#cb9-6" aria-hidden="true" tabindex="-1"></a> <span class="at">sumfile =</span> <span class="st">"dhc"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<p>The idea behind <code>load_variables()</code> is for you to be able to search for the variable code for the variable you need.</p>
</section>
<section id="census-geographies" class="level2">
<h2 class="anchored" data-anchor-id="census-geographies">Census Geographies</h2>
<p>The parameter <code>geography =</code> in <code>get_acs()</code> and <code>get_decennial()</code> allows us to request data from common enumeration units. This mean we can name the specific geography we want data from. For example, let’s get data for Hispanic population for the tri-counties: San Luis Obispo, Santa Barbara and Ventura.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb10"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a>tricounty_hispanic <span class="ot"><-</span> <span class="fu">get_decennial</span>(</span>
<span id="cb10-2"><a href="#cb10-2" aria-hidden="true" tabindex="-1"></a> <span class="at">geography =</span> <span class="st">"county"</span>,</span>
<span id="cb10-3"><a href="#cb10-3" aria-hidden="true" tabindex="-1"></a> <span class="at">state =</span> <span class="st">"CA"</span>,</span>
<span id="cb10-4"><a href="#cb10-4" aria-hidden="true" tabindex="-1"></a> <span class="at">county =</span> <span class="fu">c</span>(<span class="st">"San Luis Obispo"</span>, <span class="st">"Santa Barbara"</span>, <span class="st">"Ventura"</span>),</span>
<span id="cb10-5"><a href="#cb10-5" aria-hidden="true" tabindex="-1"></a> <span class="at">variables =</span> <span class="st">"P2_002N"</span>,</span>
<span id="cb10-6"><a href="#cb10-6" aria-hidden="true" tabindex="-1"></a> <span class="at">year =</span> <span class="dv">2020</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<p>We can also get the same information aggregated by Census Tracts by specifying the <code>geography = "tract"</code>.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb11"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a>tricounty_hispanic_tract <span class="ot"><-</span> <span class="fu">get_decennial</span>(</span>
<span id="cb11-2"><a href="#cb11-2" aria-hidden="true" tabindex="-1"></a> <span class="at">geography =</span> <span class="st">"tract"</span>,</span>
<span id="cb11-3"><a href="#cb11-3" aria-hidden="true" tabindex="-1"></a> <span class="at">state =</span> <span class="st">"CA"</span>,</span>
<span id="cb11-4"><a href="#cb11-4" aria-hidden="true" tabindex="-1"></a> <span class="at">county =</span> <span class="fu">c</span>(<span class="st">"San Luis Obispo"</span>, <span class="st">"Santa Barbara"</span>, <span class="st">"Ventura"</span>),</span>
<span id="cb11-5"><a href="#cb11-5" aria-hidden="true" tabindex="-1"></a> <span class="at">variables =</span> <span class="st">"P2_002N"</span>,</span>
<span id="cb11-6"><a href="#cb11-6" aria-hidden="true" tabindex="-1"></a> <span class="at">year =</span> <span class="dv">2020</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</section>
<section id="quering-for-multiple-variables" class="level2">
<h2 class="anchored" data-anchor-id="quering-for-multiple-variables">Quering for multiple variables</h2>
<p>The <code>varaible</code> argument can take a vector of variables as an input, allowing to query for more than one variable at the time. We can create a vector and then call that vector as the input of the <code>variable</code> argument, or we can use the concatenate function <code>c()</code> and request data from multiple variables.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb12"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb12-1"><a href="#cb12-1" aria-hidden="true" tabindex="-1"></a><span class="do">## Vector with race variables codes</span></span>
<span id="cb12-2"><a href="#cb12-2" aria-hidden="true" tabindex="-1"></a>race_vars <span class="ot"><-</span> <span class="fu">c</span>(</span>
<span id="cb12-3"><a href="#cb12-3" aria-hidden="true" tabindex="-1"></a> <span class="at">Hispanic =</span> <span class="st">"P2_002N"</span>,</span>
<span id="cb12-4"><a href="#cb12-4" aria-hidden="true" tabindex="-1"></a> <span class="at">White =</span> <span class="st">"P2_005N"</span>,</span>
<span id="cb12-5"><a href="#cb12-5" aria-hidden="true" tabindex="-1"></a> <span class="at">Black =</span> <span class="st">"P2_006N"</span>,</span>
<span id="cb12-6"><a href="#cb12-6" aria-hidden="true" tabindex="-1"></a> <span class="at">Native =</span> <span class="st">"P2_007N"</span>,</span>
<span id="cb12-7"><a href="#cb12-7" aria-hidden="true" tabindex="-1"></a> <span class="at">Asian =</span> <span class="st">"P2_008N"</span>,</span>
<span id="cb12-8"><a href="#cb12-8" aria-hidden="true" tabindex="-1"></a> <span class="at">HIPI =</span> <span class="st">"P2_009N"</span>) <span class="do">## Native Hawaiian and other Pacific Islander</span></span>
<span id="cb12-9"><a href="#cb12-9" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb12-10"><a href="#cb12-10" aria-hidden="true" tabindex="-1"></a>tricounty_race <span class="ot"><-</span> <span class="fu">get_decennial</span>(</span>
<span id="cb12-11"><a href="#cb12-11" aria-hidden="true" tabindex="-1"></a> <span class="at">geography =</span> <span class="st">"county"</span>,</span>
<span id="cb12-12"><a href="#cb12-12" aria-hidden="true" tabindex="-1"></a> <span class="at">state =</span> <span class="st">"CA"</span>,</span>
<span id="cb12-13"><a href="#cb12-13" aria-hidden="true" tabindex="-1"></a> <span class="at">county =</span> <span class="fu">c</span>(<span class="st">"San Luis Obispo"</span>, <span class="st">"Santa Barbara"</span>, <span class="st">"Ventura"</span>),</span>
<span id="cb12-14"><a href="#cb12-14" aria-hidden="true" tabindex="-1"></a> <span class="at">variables =</span> race_vars,</span>
<span id="cb12-15"><a href="#cb12-15" aria-hidden="true" tabindex="-1"></a> <span class="at">summary_var =</span> <span class="st">"P2_001N"</span>,</span>
<span id="cb12-16"><a href="#cb12-16" aria-hidden="true" tabindex="-1"></a> <span class="at">year =</span> <span class="dv">2020</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<p>Note how this data frame returns the variable name we assigned in the vector above instead of the variable code! This is a handy option, given that the codes can be hard to remember what is what.</p>
<p>Also, note that we added one more argument to our request <code>summary_var = "P2_001N</code>. This adds a column to our output data frame, with a summary variable value.</p>
<p>In every table you can generally find a variable that is an appropriate denominators for a group of variables. Following the example above, the P2 table, which provides population by race with Hispanic origin, the variable “P2001N” represents the total population. Because this variable is an an appropriate denominator for the other variables in the table, it helps to have it in a different column to make it easier to calculate proportions or percentage.</p>
</section>
<section id="getting-census-data-ready-for-analysis" class="level2">
<h2 class="anchored" data-anchor-id="getting-census-data-ready-for-analysis">Getting Census Data ready for analysis</h2>
<p>Once we access the data we want, we can apply our data wrangling skills to get the data in the format that we want.</p>
<p>Let’s demonstrate this with an example. Let’s compare the distribution of percentage White population and percentage Hispanic population by census track vary among the Tri-Counties.</p>
<p>The first step is to get the data.</p>
<section id="exercise" class="level3">
<h3 class="anchored" data-anchor-id="exercise">Exercise</h3>
<p>Make a query to get White and Hispanic population data for Tri-counties by tracks from the 2020 Decennial Census. Include the total population summary variable (summary_var = “P2_001N”).</p>
<p>Hint: variable codes are:</p>
<ul>
<li>Total Hispanic population = P2_002N</li>
<li>Total White population = P2_005N</li>
</ul>
<div class="cell">
<div class="sourceCode cell-code" id="cb13"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb13-1"><a href="#cb13-1" aria-hidden="true" tabindex="-1"></a>tricounty_track_hw <span class="ot"><-</span> <span class="fu">get_decennial</span>(</span>
<span id="cb13-2"><a href="#cb13-2" aria-hidden="true" tabindex="-1"></a> <span class="at">geography =</span> <span class="st">"tract"</span>,</span>
<span id="cb13-3"><a href="#cb13-3" aria-hidden="true" tabindex="-1"></a> <span class="at">variables =</span> <span class="fu">c</span>(<span class="at">hispanic =</span> <span class="st">"P2_002N"</span>,</span>
<span id="cb13-4"><a href="#cb13-4" aria-hidden="true" tabindex="-1"></a> <span class="at">white =</span> <span class="st">"P2_005N"</span>),</span>
<span id="cb13-5"><a href="#cb13-5" aria-hidden="true" tabindex="-1"></a> <span class="at">summary_var =</span> <span class="st">"P2_001N"</span>,</span>
<span id="cb13-6"><a href="#cb13-6" aria-hidden="true" tabindex="-1"></a> <span class="at">state =</span> <span class="st">"CA"</span>,</span>
<span id="cb13-7"><a href="#cb13-7" aria-hidden="true" tabindex="-1"></a> <span class="at">county =</span> <span class="fu">c</span>(<span class="st">"San Luis Obispo"</span>, <span class="st">"Santa Barbara"</span>, <span class="st">"Ventura"</span>),</span>
<span id="cb13-8"><a href="#cb13-8" aria-hidden="true" tabindex="-1"></a> <span class="at">year =</span> <span class="dv">2020</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<p>We can check our data by calling the <code>View(tricounty_track_hw)</code> function in the console.</p>
</section>
<section id="calculating-the-percentage-of-white-and-hispanic-population-in-each-track" class="level3">
<h3 class="anchored" data-anchor-id="calculating-the-percentage-of-white-and-hispanic-population-in-each-track">Calculating the percentage of White and Hispanic population in each track</h3>
<p>And clean the NAMES column and separate track, county and state into it’s own column using <code>tidyr::separate()</code>.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb14"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb14-1"><a href="#cb14-1" aria-hidden="true" tabindex="-1"></a>tricounty_track_clean <span class="ot"><-</span> tricounty_track_hw <span class="sc">%>%</span> </span>
<span id="cb14-2"><a href="#cb14-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">mutate</span>(<span class="at">percent =</span> <span class="dv">100</span> <span class="sc">*</span> (value <span class="sc">/</span> summary_value)) <span class="sc">%>%</span> </span>
<span id="cb14-3"><a href="#cb14-3" aria-hidden="true" tabindex="-1"></a> <span class="fu">separate</span>(NAME, <span class="at">into =</span> <span class="fu">c</span>(<span class="st">"tract"</span>, <span class="st">"county"</span>, <span class="st">"state"</span>),</span>
<span id="cb14-4"><a href="#cb14-4" aria-hidden="true" tabindex="-1"></a> <span class="at">sep =</span> <span class="st">", "</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</section>
<section id="plotting-the-data" class="level3">
<h3 class="anchored" data-anchor-id="plotting-the-data">Plotting the data</h3>
<p>Let’s create a plot to compare the distribution of percentage White population and percentage Hispanic population by census track vary among the Tri-Counties.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb15"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb15-1"><a href="#cb15-1" aria-hidden="true" tabindex="-1"></a><span class="fu">ggplot</span>(tricounty_track_clean, </span>
<span id="cb15-2"><a href="#cb15-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">aes</span>(<span class="at">x =</span> percent, <span class="at">fill =</span> county)) <span class="sc">+</span> </span>
<span id="cb15-3"><a href="#cb15-3" aria-hidden="true" tabindex="-1"></a> <span class="fu">geom_density</span>(<span class="at">alpha =</span> <span class="fl">0.5</span>)<span class="sc">+</span></span>
<span id="cb15-4"><a href="#cb15-4" aria-hidden="true" tabindex="-1"></a> <span class="fu">facet_wrap</span>(<span class="sc">~</span>variable)<span class="sc">+</span></span>
<span id="cb15-5"><a href="#cb15-5" aria-hidden="true" tabindex="-1"></a> <span class="fu">theme_light</span>()</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</section>
</section>
<section id="get_acs" class="level2">
<h2 class="anchored" data-anchor-id="get_acs"><code>get_acs()</code></h2>
<ul>
<li>The functions operates very similar to get_decennial().</li>
<li>The main differences is that is access a different survey so the options for each argument change.</li>
<li>The two required arguments are geography and variables. The function defaults to the 2017-2021 5-year ACS.</li>
<li>1-year ACS data are more current, but are only available for geographies of population 65,000 and greater.</li>
<li>Access 1-year ACS data with the argument survey = “acs1”; defaults to “acs5”.</li>
<li>Example code to get median income for California by county.</li>
</ul>
<div class="cell">
<div class="sourceCode cell-code" id="cb16"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb16-1"><a href="#cb16-1" aria-hidden="true" tabindex="-1"></a><span class="do">## 1-year survey</span></span>
<span id="cb16-2"><a href="#cb16-2" aria-hidden="true" tabindex="-1"></a>median_income_1yr <span class="ot"><-</span> <span class="fu">get_acs</span>(</span>
<span id="cb16-3"><a href="#cb16-3" aria-hidden="true" tabindex="-1"></a> <span class="at">geography =</span> <span class="st">"county"</span>,</span>
<span id="cb16-4"><a href="#cb16-4" aria-hidden="true" tabindex="-1"></a> <span class="at">variables =</span> <span class="st">"B19013_001"</span>,</span>
<span id="cb16-5"><a href="#cb16-5" aria-hidden="true" tabindex="-1"></a> <span class="at">state =</span> <span class="st">"CA"</span>,</span>
<span id="cb16-6"><a href="#cb16-6" aria-hidden="true" tabindex="-1"></a> <span class="at">year =</span> <span class="dv">2021</span>,</span>
<span id="cb16-7"><a href="#cb16-7" aria-hidden="true" tabindex="-1"></a> <span class="at">survey =</span> <span class="st">"acs1"</span>)</span>
<span id="cb16-8"><a href="#cb16-8" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb16-9"><a href="#cb16-9" aria-hidden="true" tabindex="-1"></a><span class="do">## 5-year survey. Defaults to the 2017-2021 5-year ACS</span></span>
<span id="cb16-10"><a href="#cb16-10" aria-hidden="true" tabindex="-1"></a>median_income_5yr <span class="ot"><-</span> <span class="fu">get_acs</span>(</span>
<span id="cb16-11"><a href="#cb16-11" aria-hidden="true" tabindex="-1"></a> <span class="at">geography =</span> <span class="st">"county"</span>,</span>
<span id="cb16-12"><a href="#cb16-12" aria-hidden="true" tabindex="-1"></a> <span class="at">variables =</span> <span class="st">"B19013_001"</span>,</span>
<span id="cb16-13"><a href="#cb16-13" aria-hidden="true" tabindex="-1"></a> <span class="at">state =</span> <span class="st">"CA"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<ul>
<li>You can access to different variables in a survey with the load_variables() function.</li>
</ul>
<div class="cell">
<div class="sourceCode cell-code" id="cb17"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb17-1"><a href="#cb17-1" aria-hidden="true" tabindex="-1"></a><span class="do">## variables for 5-year 2017-2021 ACS</span></span>
<span id="cb17-2"><a href="#cb17-2" aria-hidden="true" tabindex="-1"></a>vars <span class="ot"><-</span> <span class="fu">load_variables</span>(<span class="dv">2021</span>, <span class="st">"acs5"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</section>
<section id="spatial-census-data-in-tidycensus" class="level2">
<h2 class="anchored" data-anchor-id="spatial-census-data-in-tidycensus">Spatial Census Data in <code>tidycensus</code></h2>
<p>To work with “spatial” Census data you would generally have to go and find shapefiles on the Census website, download a CSV with the data, clean and format the data, load the geometries and data to your spatial data software of choice, then align the key fields and join your data with the geometries.</p>
<p>Again, <code>tidycensus</code> to the rescue! This packages combines all these steps and makes it very easy to get census data nd its geometries ready for analysis. Let’s see how this work.</p>
<p>So now, if we want to retrieve data for income estimates by county for California with it’s associated geometries we need to know the variable for income estimates (“B19013_001”), call <code>get_acs()</code> with all the necessary information and add the argument <code>geometry = TRUE</code> to get the spatial data for each geography.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb18"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb18-1"><a href="#cb18-1" aria-hidden="true" tabindex="-1"></a><span class="do">## defaults to most recent 5year estimates (2017-2021 5-year ACS)</span></span>
<span id="cb18-2"><a href="#cb18-2" aria-hidden="true" tabindex="-1"></a>ca_income <span class="ot"><-</span> <span class="fu">get_acs</span>(</span>
<span id="cb18-3"><a href="#cb18-3" aria-hidden="true" tabindex="-1"></a> <span class="at">geography =</span> <span class="st">"county"</span>,</span>
<span id="cb18-4"><a href="#cb18-4" aria-hidden="true" tabindex="-1"></a> <span class="at">variables =</span> <span class="st">"B19013_001"</span>,</span>
<span id="cb18-5"><a href="#cb18-5" aria-hidden="true" tabindex="-1"></a> <span class="at">state =</span> <span class="st">"CA"</span>,</span>
<span id="cb18-6"><a href="#cb18-6" aria-hidden="true" tabindex="-1"></a> <span class="at">year =</span> <span class="dv">2021</span>,</span>
<span id="cb18-7"><a href="#cb18-7" aria-hidden="true" tabindex="-1"></a> <span class="at">geometry =</span> <span class="cn">TRUE</span>) <span class="do">## This argument does all of the steps mentioned above.</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<p>Now we have the corresponding spatial data bind to our variable of interest. We can plot this data using the base r <code>plot()</code> function.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb19"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb19-1"><a href="#cb19-1" aria-hidden="true" tabindex="-1"></a><span class="fu">plot</span>(ca_income[<span class="st">"estimate"</span>])</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</section>
<section id="interactive-maps" class="level2">
<h2 class="anchored" data-anchor-id="interactive-maps">Interactive maps</h2>
<div class="cell">
<div class="sourceCode cell-code" id="cb20"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb20-1"><a href="#cb20-1" aria-hidden="true" tabindex="-1"></a><span class="fu">mapview</span>(ca_income, <span class="at">zcol =</span> <span class="st">"estimate"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</section>
<section id="mapping-acs-data-with-ggplot2" class="level2">
<h2 class="anchored" data-anchor-id="mapping-acs-data-with-ggplot2">Mapping ACS data with <code>ggplot2</code></h2>
<ol type="1">
<li>Get <em>race</em> data fro Santa Barbara County</li>
</ol>
<div class="cell">
<div class="sourceCode cell-code" id="cb21"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb21-1"><a href="#cb21-1" aria-hidden="true" tabindex="-1"></a>race_var <span class="ot"><-</span> <span class="fu">c</span>(</span>
<span id="cb21-2"><a href="#cb21-2" aria-hidden="true" tabindex="-1"></a> <span class="at">Hispanic =</span> <span class="st">"DP05_0071P"</span>,</span>
<span id="cb21-3"><a href="#cb21-3" aria-hidden="true" tabindex="-1"></a> <span class="at">White =</span> <span class="st">"DP05_0077P"</span>,</span>
<span id="cb21-4"><a href="#cb21-4" aria-hidden="true" tabindex="-1"></a> <span class="at">Black =</span> <span class="st">"DP05_0078P"</span>,</span>
<span id="cb21-5"><a href="#cb21-5" aria-hidden="true" tabindex="-1"></a> <span class="at">Asian =</span> <span class="st">"DP05_0080P"</span>)</span>
<span id="cb21-6"><a href="#cb21-6" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb21-7"><a href="#cb21-7" aria-hidden="true" tabindex="-1"></a><span class="do">## Default long</span></span>
<span id="cb21-8"><a href="#cb21-8" aria-hidden="true" tabindex="-1"></a>sb_race <span class="ot"><-</span> <span class="fu">get_acs</span>(</span>
<span id="cb21-9"><a href="#cb21-9" aria-hidden="true" tabindex="-1"></a> <span class="at">geography =</span> <span class="st">"tract"</span>,</span>
<span id="cb21-10"><a href="#cb21-10" aria-hidden="true" tabindex="-1"></a> <span class="at">variables =</span> race_var,</span>
<span id="cb21-11"><a href="#cb21-11" aria-hidden="true" tabindex="-1"></a> <span class="at">state =</span> <span class="st">"CA"</span>,</span>
<span id="cb21-12"><a href="#cb21-12" aria-hidden="true" tabindex="-1"></a> <span class="at">county =</span> <span class="st">"Santa Barbara"</span>,</span>
<span id="cb21-13"><a href="#cb21-13" aria-hidden="true" tabindex="-1"></a> <span class="at">geometry =</span> <span class="cn">TRUE</span>) <span class="sc">%>%</span> </span>
<span id="cb21-14"><a href="#cb21-14" aria-hidden="true" tabindex="-1"></a> <span class="fu">filter</span>(GEOID <span class="sc">!=</span> <span class="st">"06083980100"</span>) <span class="do">## filtering out channel island polygons (census tract 9801 in 2020 census)</span></span>
<span id="cb21-15"><a href="#cb21-15" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb21-16"><a href="#cb21-16" aria-hidden="true" tabindex="-1"></a><span class="fu">head</span>(sb_race)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<ol start="2" type="1">
<li>Filter for Hispanic population</li>
</ol>
<div class="cell">
<div class="sourceCode cell-code" id="cb22"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb22-1"><a href="#cb22-1" aria-hidden="true" tabindex="-1"></a>sb_hispanic <span class="ot"><-</span> <span class="fu">filter</span>(sb_race,</span>
<span id="cb22-2"><a href="#cb22-2" aria-hidden="true" tabindex="-1"></a> variable <span class="sc">==</span> <span class="st">"Hispanic"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<ol start="3" type="1">
<li>Plot!</li>
</ol>
<div class="cell">
<div class="sourceCode cell-code" id="cb23"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb23-1"><a href="#cb23-1" aria-hidden="true" tabindex="-1"></a><span class="fu">ggplot</span>(sb_hispanic,</span>
<span id="cb23-2"><a href="#cb23-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">aes</span>(<span class="at">fill =</span> estimate))<span class="sc">+</span></span>
<span id="cb23-3"><a href="#cb23-3" aria-hidden="true" tabindex="-1"></a> <span class="fu">geom_sf</span>() <span class="do">## plots polygons!</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<p>Now we can make out plot look nicer..</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb24"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb24-1"><a href="#cb24-1" aria-hidden="true" tabindex="-1"></a><span class="fu">ggplot</span>(sb_hispanic, <span class="fu">aes</span>(<span class="at">fill =</span> estimate)) <span class="sc">+</span> </span>
<span id="cb24-2"><a href="#cb24-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">geom_sf</span>() <span class="sc">+</span> </span>
<span id="cb24-3"><a href="#cb24-3" aria-hidden="true" tabindex="-1"></a> <span class="fu">theme_void</span>() <span class="sc">+</span> </span>
<span id="cb24-4"><a href="#cb24-4" aria-hidden="true" tabindex="-1"></a> <span class="fu">scale_fill_viridis_c</span>(<span class="at">option =</span> <span class="st">"rocket"</span>) <span class="sc">+</span> </span>
<span id="cb24-5"><a href="#cb24-5" aria-hidden="true" tabindex="-1"></a> <span class="fu">labs</span>(<span class="at">title =</span> <span class="st">"Percent Hispanic by Census tract"</span>,</span>
<span id="cb24-6"><a href="#cb24-6" aria-hidden="true" tabindex="-1"></a> <span class="at">subtitle =</span> <span class="st">"Santa Barbara County, California"</span>,</span>
<span id="cb24-7"><a href="#cb24-7" aria-hidden="true" tabindex="-1"></a> <span class="at">fill =</span> <span class="st">"ACS estimate"</span>,</span>
<span id="cb24-8"><a href="#cb24-8" aria-hidden="true" tabindex="-1"></a> <span class="at">caption =</span> <span class="st">"2017-2021 ACS | tidycensus R package"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<p>You can also plot you data in bins instead of a continuous scale.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb25"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb25-1"><a href="#cb25-1" aria-hidden="true" tabindex="-1"></a><span class="fu">ggplot</span>(sb_hispanic, <span class="fu">aes</span>(<span class="at">fill =</span> estimate)) <span class="sc">+</span> </span>
<span id="cb25-2"><a href="#cb25-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">geom_sf</span>() <span class="sc">+</span> </span>
<span id="cb25-3"><a href="#cb25-3" aria-hidden="true" tabindex="-1"></a> <span class="fu">theme_void</span>() <span class="sc">+</span> </span>
<span id="cb25-4"><a href="#cb25-4" aria-hidden="true" tabindex="-1"></a> <span class="fu">scale_fill_viridis_b</span>(<span class="at">option =</span> <span class="st">"rocket"</span>, <span class="at">n.breaks =</span> <span class="dv">6</span>) <span class="sc">+</span> </span>
<span id="cb25-5"><a href="#cb25-5" aria-hidden="true" tabindex="-1"></a> <span class="fu">labs</span>(<span class="at">title =</span> <span class="st">"Percent Hispanic by Census tract"</span>,</span>
<span id="cb25-6"><a href="#cb25-6" aria-hidden="true" tabindex="-1"></a> <span class="at">subtitle =</span> <span class="st">"Santa Barbara County, California"</span>,</span>
<span id="cb25-7"><a href="#cb25-7" aria-hidden="true" tabindex="-1"></a> <span class="at">fill =</span> <span class="st">"ACS estimate"</span>,</span>
<span id="cb25-8"><a href="#cb25-8" aria-hidden="true" tabindex="-1"></a> <span class="at">caption =</span> <span class="st">"2017-2021 ACS | tidycensus R package"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<p>Which style to use will depends on what you want to achieve. We can see that in the plot with bins we loose some resolution. On the other hand the continuous scale can provide a little of a color over load.</p>
<p>We can keep leveraging on ggplot2 power and plot more variables of our data. For example create a map for each of the difference races on our data.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb26"><pre class="sourceCode r code-with-copy"><code class="sourceCode r"><span id="cb26-1"><a href="#cb26-1" aria-hidden="true" tabindex="-1"></a><span class="fu">ggplot</span>(sb_race, <span class="fu">aes</span>(<span class="at">fill =</span> estimate)) <span class="sc">+</span> </span>
<span id="cb26-2"><a href="#cb26-2" aria-hidden="true" tabindex="-1"></a> <span class="fu">geom_sf</span>(<span class="at">color =</span> <span class="cn">NA</span>) <span class="sc">+</span> <span class="do">## removes delimitation of each tract</span></span>
<span id="cb26-3"><a href="#cb26-3" aria-hidden="true" tabindex="-1"></a> <span class="fu">theme_void</span>() <span class="sc">+</span> </span>
<span id="cb26-4"><a href="#cb26-4" aria-hidden="true" tabindex="-1"></a> <span class="fu">scale_fill_viridis_c</span>(<span class="at">option =</span> <span class="st">"rocket"</span>) <span class="sc">+</span> </span>
<span id="cb26-5"><a href="#cb26-5" aria-hidden="true" tabindex="-1"></a> <span class="fu">facet_wrap</span>(<span class="sc">~</span>variable) <span class="sc">+</span></span>
<span id="cb26-6"><a href="#cb26-6" aria-hidden="true" tabindex="-1"></a> <span class="fu">labs</span>(<span class="at">title =</span> <span class="st">"Race / ethnicity by Census tract"</span>,</span>
<span id="cb26-7"><a href="#cb26-7" aria-hidden="true" tabindex="-1"></a> <span class="at">subtitle =</span> <span class="st">"Santa Barbara County, California"</span>,</span>
<span id="cb26-8"><a href="#cb26-8" aria-hidden="true" tabindex="-1"></a> <span class="at">fill =</span> <span class="st">"ACS estimate (%)"</span>,</span>
<span id="cb26-9"><a href="#cb26-9" aria-hidden="true" tabindex="-1"></a> <span class="at">caption =</span> <span class="st">"2017-2021 ACS | tidycensus R package"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</section>
<section id="more-on-maps" class="level2">
<h2 class="anchored" data-anchor-id="more-on-maps">More on maps</h2>
<p>Check out the following resources to learn more about mapping census data and spatial analysis.</p>
<ul>
<li>The <code>tmap</code> package (<a href="https://www.jstatsoft.org/article/view/v084i06">Tennekes 2018</a>) is an alternative to <code>ggplot2</code> for creating custom maps. T stands for “Thematic”, refering to the phenomena that is shown or plotted, for example demographical, social, cultural, or economic phenomena. This package includes a wide range of functionality for custom cartography. Example of <code>tmap</code> and <code>tidycensus</code> in <a href="https://walker-data.com/census-r/mapping-census-data-with-r.html#map-making-with-tmap">Walker 2023, Chapter 6</a>.</li>
<li><a href="https://walker-data.com/census-r/mapping-census-data-with-r.html#reactive-mapping-with-shiny">Reactive mapping with <code>Shiny</code></a></li>
<li>Spatial Analysis with Census Data, <a href="https://walker-data.com/census-r/spatial-analysis-with-us-census-data.html">Walker 2023, Chapter 7</a></li>
<li>Modeling Census Data, <a href="https://walker-data.com/census-r/modeling-us-census-data.html#modeling-us-census-data">Walker 2023 Chapter 8</a>. Indices for segregation and diversity are addresed in this chapter.</li>
</ul>
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