Here is the course link.
As a data scientist, you will often find yourself working with non-numerical data, such as job titles, survey responses, or demographic information. This type of data is qualitative and can be ordinal, if they have an order to them, or categorical/nominal, if they don’t. R has a special way of representing them, called factors, and this course will help you master working with them using the tidyverse package forcats. We’ll also work with other tidyverse packages, including ggplot2, dplyr, stringr, and tidyr and use real world datasets, such as the fivethirtyeight flight dataset and Kaggle’s State of Data Science and ML Survey. Following this course, you’ll be able to identify and manipulate factor variables, quickly and efficiently visualize your data, and effectively communicate your results. Get ready to categorize!
Chapter 1: Introduction to Factor Variables (Free)
In this chapter, you’ll learn all about qualitative variables. You’ll discover the difference between categorical and ordinal variables, how R represents them, and how to inspect them to find the number and names of the levels. Finally, you’ll find how forcats, a tidyverse package, can improve your plots by letting you quickly reorder variables by their frequency.
Chapter 2: Manipulating Factor Variables
You’ll continue to dive into the forcats package, learning how to change the order and names of levels and even collapse them into one another.
Chapter 3: Creating Factor Variables
Having gotten a good grasp of forcats, you’ll expand out to the rest of the tidyverse, learning and reviewing functions from dplyr, tidyr, and stringr. You’ll refine graphs with ggplot2 by changing axes to percentage scales, editing the layout of the text, and more.
Chapter 4: Case Study on Flight Etiquette
In this final chapter, you’ll take all that you’ve learned and apply it in a case study. You’ll learn more about working with strings and summarizing data, then replicate a publication quality plot 538 plot.