This repository contains the third lesson for the Data Wrangling in R seminar. This lesson covers the basics of using using dplyr's group_by and summarise functions to created grouped summaries.

By the end of this lesson, learners should be able to:

1. Create a basic grouped summary of the count of observations
2. Construct more complex grouped summaries using window functions
3. Integrated grouped summaries with other dplyr functions

• The SETUP.md file in the references/ directory contains a list of packages required for this lesson
• The notebook/ directory contains our primary teaching materials, included a completed version of the notebook we will be working on during the seminar.
• The lesson slides provide an overview of the DSS and data cleaning.
• The references/ directory also contains other notes on changes to the repository, key topics, terms, data sources, and software.

• R for Data Science, Chapter 5 - Data Transformation
• RStudio's dplyr Cheat Sheet

The packages we'll need for today can be installed using:

install.packages(c("tidyverse", "gapminder", "here", "knitr", "rmarkdown", "usethis"))

You can download this lesson to your Desktop easily using usethis:

usethis::use_course("https://github.com/slu-dss/wrangling-04/archive/master.zip")

By using usethis::use_course, all of the lesson materials will be downloaded to your computer, automatically extracted, and saved to your desktop. You can then open the .Rproj file to get started.

Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.

The SLU Data Science Seminar (DSS) is a collaborative, interdisciplinary group at Saint Louis University focused on building researchers’ data science skills using open source software. We currently host seminars focused on the programming language R. The SLU DSS is co-organized by Christina Gacia, Ph.D., Kelly Lovejoy, Ph.D., and Christopher Prener, Ph.D.. You can keep up with us here on GitHub, on our website, and on Twitter.

Founded in 1818, Saint Louis University is one of the nation’s oldest and most prestigious Catholic institutions. Rooted in Jesuit values and its pioneering history as the first university west of the Mississippi River, SLU offers nearly 13,000 students a rigorous, transformative education of the whole person. At the core of the University’s diverse community of scholars is SLU’s service-focused mission, which challenges and prepares students to make the world a better, more just place.