rmd-intro.Rmd

---
title: "Markdown lesson"
author: "Peter"
date: "11/13/2020"
output:
  pdf_document: default
  html_document: default
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```

```{r}
library(readr)
```


# Introduction

This is a short training segment in which we will be calculating the Redfield ratio for a small estuary in Alaska based on oceanographic data collected in 2008.

```{r message=FALSE, warning=FALSE}
bg_chem <- read_csv("BGchem2008data.csv")

```

# Analysis
* calculate summary statistics 
```{r}
nitrate <- mean(bg_chem$NO3)
nitrite <- mean(bg_chem$NO2)
amm <- mean(bg_chem$NH4)
phos <- mean(bg_chem$P)
```

* calculate mean Redfield ratio
```{r}
ratio <- (nitrate + nitrite + amm)/phos
```

The Redfield ratio for this dataset is approximately `r round(ratio)`.

* plot Redfield ratio
```{r, echo = FALSE}
plot(bg_chem$P, bg_chem$NO2 + bg_chem$NO3 + bg_chem$NH4)
```


Data downloaded from [Arctic Data Center](https://arcticdata.io/catalog/view/doi:10.18739/A25T3FZ8X)