This is the repo for an introduction to R using the tidyverse developed for BC Stats.
The repo currently reflects a 1.5 day version delivered July 2018. If you are looking for an older version, try:
Solutions to "Your Turns" available at r_intro_bc_stats_solutions.
Introduction to data science with the tidyverse by Charlotte Wickham is licensed under a Creative Commons Attribution 4.0 International License. Based on a work at https://github.com/rstudio/master-the-tidyverse.
This course will give you a feel for the complete data analysis process in R - from importing and manipulating data through visualization. You'll see how using code to capture the analysis pipeline leads to deliverables that are documented, easily reproduced and easily automated.
We'll focus on tools in the tidyverse a core set of R packages that are designed to be easy to learn, easy to use, and solve the most frequent data analysis problems.
During the course, we'll alternate between me introducing a new concept with some examples, and you applying that concept on your own. You should expect to spend at least 50% of your time writing code in RStudio on your own laptop.
The first half day is specifically for those who are new to R. Take a look at the prerequisites to see if you might be able to skip it.
| Session | Date/Time | Topic |
|---|---|---|
| Day 1: afternoon | Tue Jul 24th 1pm-4:30pm | Getting Started with R and RStudio |
| Day 2: morning | Wed Jul 25th 8:30am-12pm |
Data Visualization with ggplot2
|
| Day 2: afternoon | Wed Jul 25th 1pm-4:30pm |
Data Manipulation with dplyr and tidyr
|
On your first afternoon you'll focus on getting comfortable writing code and executing it in RStudio. We'll take things slow as you learn to navigate RStudio, learn some syntax rules, and how to get help when you get stuck. Along the way you'll meet R's most ubiquitous objects for holding data and learn to import data whether it is a CSV, SPSS or Excel data file.
By the end of the day you will be able to:
- Open a notebook in RStudio and execute the code chunks in it
- Install and load an R package
- Open the help page for a function or built-in dataset
- Identify the components of an R function: the function name and arguments
- Assign the results of a function to a new variable
- Get an overview of a dataset that is in a data frame or tibble
- Import CSV, SPSS and SAS data files
We'll start the day with visualization of data in R using the package ggplot2. You'll see how ggplot2 provides a framework for thinking about plots, which means you only need to learn one template to make almost any plot you can imagine. To practice, you'll make some of the most common kinds of data visualizations: histograms, scatterplots and time series plots, and continue building your skills as we continue through data manipulation.
In the afternoon we'll focus of the most common types of data manipulation: extracting subsets from data, adding new variables and creating grouped summaries. You'll find that doing this is quite intuitive using the dplyr package which boils down manipulation into a set of verbs like: filter(), mutate() and summarise(). Occasionally, data won't come in quite the right shape for manipulation or visualization you want to do, so we'll also talk about the key parts of the tidyr package that help to reshape not not-so-tidy data.
By the end of the day you will be able to:
-
Create plots in
ggplot2to explore data - Select variables and filter observations to subset data
- Add new variables, and transform variables
- Create grouped summaries of data
- Reshape data for use with tidy tools
The first half-day is specifically for people that are new to R. You can safely join us starting on day 2 if you already:
- know how to define variables in R
-
have called a few basic functions (e.g.
mean()), and - know how to open .R script files, and run code in the console
Although I'll assume on the first half-day you haven't used R, you might like to get a little experience before we meet. Some options are:
- Work through the non-interactive Chapter 1 of Hands on Programming with R, which introduces RStudio as well as basic R syntax.
- Work through the interactive chapters at Try R
- Try the free “Introduction to R” course at DataCamp
You'll need to bring a laptop with R and RStudio installed. In addition, you'll want to install the following packages:
install.packages(c("tidyverse", "rmarkdown", "gapminder", "usethis"))
If you've installed the tidyverse before, re-installing it may not update all the component packages, in which case run,
tidyverse::tidyverse_update()
to identify any out-of-date packages, and follow the instructions to update them.
Don't forget to bring your power cable!
I'll also be providing some additional materials (slides, code and data) prior to our meeting, keep your eyes out for an email about soon.
To download the materials, open RStudio and on the Console run:
usethis::use_course("bit.ly/rintro-bc")
After a pause, you'll be asked a few questions about the download process. The materials will be downloaded, unzipped and a new RStudio session will open.
You only need to do this once. If you close RStudio, and want to pick it up again later (i.e. on the day of the training):
-
Navigate to where the folder was downloaded (this should be a folder called
r\_intro\_bc\_stats-masteron your Desktop) -
Double-click the file
r\_intro\_bc\_stats.Rprojto open up RStudio
Charlotte Wickham