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slides_data_in_R.html
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<body class="quarto-light">
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<div class="slides">
<section id="title-slide" class="quarto-title-block center">
<h1 class="title">Data in R with RStudio</h1>
<div class="quarto-title-authors">
<div class="quarto-title-author">
<div class="quarto-title-author-name">
Abner Heredia Bustos, CSCAR
</div>
</div>
</div>
</section>
<section id="about-this-workshop" class="slide level2">
<h2>About this workshop</h2>
<p>For beginner <strong>R</strong> coders that want to understand how to manipulate different types of data. We will use RStudio to learn:</p>
<ul>
<li class="fragment">How R stores and handles different types of data.</li>
<li class="fragment">Basic ways to create, import, clean, summarize, and plot data.</li>
<li class="fragment">But <em>NOT</em> statistical modeling.</li>
</ul>
</section>
<section id="workshop-format" class="slide level2">
<h2>Workshop format</h2>
<ul>
<li class="fragment">From 2:30 to 4:45 pm.</li>
<li class="fragment">Breaks every 45 minutes.</li>
<li class="fragment">A few slides for context and extra information.</li>
<li class="fragment">A lot of hands-on coding and live demonstrations.</li>
<li class="fragment">All materials will be available after the workshop ends.</li>
</ul>
<aside class="notes">
<p>This workshop runs from 2:30 to 4:45 pm, with breaks every 45 minutes. Right now I will use a few slides for context and extra information. But this is a WORKshop, so there will be plenty of hands-on coding and live demonstrations. All materials will be available after the workshop ends, so don’t worry about copying these slides.</p>
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<section id="tips-for-this-workshop" class="slide level2">
<h2>Tips for this workshop</h2>
<ul>
<li class="fragment">Coding along with me is the best way to learn.</li>
<li class="fragment">Ask questions at any time.</li>
<li class="fragment">During exercises, interact with your peers.</li>
<li class="fragment">Make sure to type your code in an RStudio script.</li>
</ul>
<aside class="notes">
<p>Coding along with me is the best way to learn. If you just watch, you will not remember anything after you leave today. Feel free to ask questions at any time. Code can be confusing and mistakes are easy to make, but I’m here to help, so don’t be afraid to interrupt me. During exercises, interact with your peers. We all struggle with computers, but it’s easier if we can help each other.</p>
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</section>
<section id="what-is-cscar" class="slide level2">
<h2>What is CSCAR?</h2>
<ul>
<li class="fragment">Full name: Consulting for Statistics, Computing and Analytics Research.</li>
<li class="fragment">A unit of the Office of the Vice President of Research (OVPR).</li>
<li class="fragment">Guides and trains researchers in data collection, management, and analysis.</li>
<li class="fragment">Also helps researchers to use technical software and advanced computing.</li>
</ul>
<aside class="notes">
<p>Before we get to the coding part, let me tell you a little bit about the people behind this workshop: CSCAR.</p>
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<section id="cscar-is-here-to-help-you" class="slide level2">
<h2>CSCAR is here to help you</h2>
<ul>
<li class="fragment">Free, one-hour consultations with full-time statistical consultants.</li>
<li class="fragment">GSRAs are available for walk-in consultations Monday through Friday, between 9am and 5pm (we close on Tuesdays between noon and 1pm).</li>
<li class="fragment">All of our scheduled appointments can be either remote or in-person.</li>
</ul>
<aside class="notes">
<p>All of our scheduled appointments can be either remote or in-person. So, if you live out of town, work in a different campus or just don’t want to deal with bad weather, you can still ask CSCAR for help.</p>
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</section>
<section id="contact-cscar" class="slide level2">
<h2>Contact CSCAR</h2>
<ul>
<li class="fragment">To request a consultation: email <a href="mailto:[email protected]" class="email">[email protected]</a>, or fill <a href="https://docs.google.com/forms/d/e/1FAIpQLSei-twcjFkoobUrVwSQTmSxdKKEc1Ub8w5LHmeIZUmTV1wmIg/viewform?pli=1">this form</a>. Or visit <a href="cscar.research.umich.edu">cscar.research.umich.edu</a>.</li>
<li class="fragment">Self-schedule a consultation with a GSRA using <a href="https://calendar.google.com/calendar/u/0/appointments/AcZssZ1DT776EMK1EGFFmBRyW-FrQrzo35QnU2nIv1E=">this link</a>.</li>
<li class="fragment">Address: The University of Michigan, 3560 Rackham, 915 E. Washington St., Ann Arbor, MI 48109-1070.</li>
</ul>
<aside class="notes">
<p>There are several ways to contact CSCAR. You can request a consultation by email or by filling this form. You can also self-schedule a consultation with a GSRA using this link. Our office is at 3560 Rackham, 915 E. Washington St., Ann Arbor, Michigan.</p>
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</section>
<section id="who-am-i" class="slide level2">
<h2>Who am I?</h2>
<ul>
<li class="fragment">Abner Heredia Bustos, a data science consultant at CSCAR.</li>
<li class="fragment">I want to make coding as simple and effortless as possible…</li>
<li class="fragment">…which means learning it well from the beginning.</li>
</ul>
<aside class="notes">
<p>My name is Abner Heredia Bustos. I am a data science consultant at CSCAR. Apart from this, all you need to know is that, for me, coding is just a means to an end. So, I will try hard to make coding as simple and effortless as possible for you; but to achieve this you will need to put some effort in learning the basics.</p>
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</section>
<section id="why-are-you-trying-to-learn-r" class="title-slide slide level1 center">
<h1>Why are you trying to learn R?</h1>
</section>
<section>
<section id="lets-start-coding" class="title-slide slide level1 center">
<h1>Let’s start coding</h1>
</section>
<section id="coercion" class="slide level2">
<h2>Coercion</h2>
<p>When adding different data types to the same atomic vector, <strong>R</strong> follows specific rules to coerce everything to be of the same type.</p>
<ul>
<li class="fragment">If a character string is present in an atomic vector, <strong>R</strong> will convert all other values to character strings.</li>
<li class="fragment">If a vector only contains logicals and numbers, <strong>R</strong> will convert the logicals to numbers; every <code>TRUE</code> becomes a <code>1</code>, and every <code>FALSE</code> becomes a <code>0</code>.</li>
<li class="fragment"><code>NA</code>s are never coerced automatically.</li>
</ul>
</section>
<section id="make-a-histogram" class="slide level2">
<h2>Make a histogram</h2>
<p>Use the example I showed to you to make a histogram for variable <code>height</code>. Bonus: can you color the bars?</p>
<p>Your histogram result should resemble this one:</p>
<img data-src="slides_data_in_R_files/figure-revealjs/histogram%20of%20height-1.png" class="quarto-figure quarto-figure-center r-stretch" width="624"></section>
<section class="slide level2">
<p>Here is the code for the histogram:</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb1"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb1-1"><a href=""></a><span class="fu">hist</span>(</span>
<span id="cb1-2"><a href=""></a> flower_df<span class="sc">$</span>height,</span>
<span id="cb1-3"><a href=""></a> <span class="at">breaks =</span> <span class="dv">12</span>,</span>
<span id="cb1-4"><a href=""></a> <span class="at">xlim =</span> <span class="fu">c</span>(<span class="dv">0</span>, <span class="dv">20</span>),</span>
<span id="cb1-5"><a href=""></a> <span class="at">xlab =</span> <span class="st">"Height"</span>,</span>
<span id="cb1-6"><a href=""></a> <span class="at">main =</span> <span class="st">"Few weights are above 20"</span>,</span>
<span id="cb1-7"><a href=""></a> <span class="at">col =</span> <span class="st">"green"</span></span>
<span id="cb1-8"><a href=""></a>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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</section>
<section id="make-a-boxplot" class="slide level2">
<h2>Make a boxplot</h2>
<p>Use the example I showed to you to make a histogram for variable <code>leaf_area</code>. Bonus: can you color the box?</p>
<img data-src="slides_data_in_R_files/figure-revealjs/boxplot%20for%20leaf_area-1.png" class="quarto-figure quarto-figure-center r-stretch" width="384"></section>
<section class="slide level2">
<p>Here is the code for the boxplot.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb2"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb2-1"><a href=""></a><span class="fu">boxplot</span>(</span>
<span id="cb2-2"><a href=""></a> flower_df<span class="sc">$</span>leaf_area, </span>
<span id="cb2-3"><a href=""></a> <span class="at">ylab =</span> <span class="st">"Leaf area"</span>, </span>
<span id="cb2-4"><a href=""></a> <span class="at">col =</span> <span class="st">"blue"</span>,</span>
<span id="cb2-5"><a href=""></a> <span class="at">main =</span> <span class="st">"Most leaf areas are between 11 and 18"</span></span>
<span id="cb2-6"><a href=""></a>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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</section>
<section id="make-a-scatterplot" class="slide level2">
<h2>Make a scatterplot</h2>
<p>Use the example I showed to you to make a scatter plot with <code>height</code> and <code>weight</code>, coloring by nitrogen level. Remember to add a legend to the plot. Your scatter plot should resemble this one:</p>
</section>
<section class="slide level2">
<img data-src="slides_data_in_R_files/figure-revealjs/unnamed-chunk-4-1.png" class="quarto-figure quarto-figure-center r-stretch" width="576"></section>
<section class="slide level2">
<p>Here is the code for the scatter plot.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb3"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb3-1"><a href=""></a><span class="fu">plot</span>(</span>
<span id="cb3-2"><a href=""></a> <span class="at">x =</span> flower_df<span class="sc">$</span>weight,</span>
<span id="cb3-3"><a href=""></a> <span class="at">y =</span> flower_df<span class="sc">$</span>height, </span>
<span id="cb3-4"><a href=""></a> <span class="at">col =</span> flower_df<span class="sc">$</span>nitrogen,</span>
<span id="cb3-5"><a href=""></a> <span class="at">main =</span> <span class="st">"No clear association between height and weight"</span>,</span>
<span id="cb3-6"><a href=""></a> <span class="at">xlab =</span> <span class="st">"Weight"</span>,</span>
<span id="cb3-7"><a href=""></a> <span class="at">ylab =</span> <span class="st">"Height"</span></span>
<span id="cb3-8"><a href=""></a>)</span>
<span id="cb3-9"><a href=""></a><span class="co"># Add a legend to the plot</span></span>
<span id="cb3-10"><a href=""></a><span class="fu">legend</span>(</span>
<span id="cb3-11"><a href=""></a> <span class="at">x =</span> <span class="st">"bottomright"</span>, </span>
<span id="cb3-12"><a href=""></a> <span class="at">legend =</span> <span class="fu">levels</span>(flower_df<span class="sc">$</span>nitrogen), </span>
<span id="cb3-13"><a href=""></a> <span class="at">col =</span> <span class="dv">1</span><span class="sc">:</span><span class="fu">length</span>(<span class="fu">levels</span>(flower_df<span class="sc">$</span>nitrogen)), </span>
<span id="cb3-14"><a href=""></a> <span class="at">pch =</span> <span class="dv">16</span></span>
<span id="cb3-15"><a href=""></a>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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</section>
<section id="make-a-mosaic-plot" class="slide level2">
<h2>Make a mosaic plot</h2>
<p>Use the example I showed to you to make a mosaic plot to visualize how frequently the values of nitrogen and treat combine with each other, but only for flowers with a weight below 10. Your plot should resemble this:</p>
</section>
<section class="slide level2">
<img data-src="slides_data_in_R_files/figure-revealjs/mosaic%20plot%20for%20nitrogen%20vs%20treat-1.png" class="quarto-figure quarto-figure-center r-stretch" width="480"></section>
<section class="slide level2">
<p>Here is the code for the mosaic plot</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb4"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb4-1"><a href=""></a>nitrogen_by_treat_table <span class="ot">=</span> <span class="fu">xtabs</span>(</span>
<span id="cb4-2"><a href=""></a> <span class="at">formula =</span> <span class="sc">~</span> nitrogen <span class="sc">+</span> treat,</span>
<span id="cb4-3"><a href=""></a> <span class="at">data =</span> flower_df[<span class="fu">which</span>(flower_df<span class="sc">$</span>weight <span class="sc"><</span> <span class="dv">10</span>),]</span>
<span id="cb4-4"><a href=""></a>)</span>
<span id="cb4-5"><a href=""></a><span class="fu">mosaicplot</span>(nitrogen_by_treat_table, <span class="at">main =</span> <span class="st">"Nitrogen by treat, weight below 10"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
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