General
Appendix of Videos in Course Textbook
These are the instructional videos that appear throughout the course textbook. Title Link What is Between Group vs Within Group Variation? Transcript https://player.vimeo.com/video/379060892 How to Tell if One Variable "Explains Variation" in ...
Printing Pages of the Book
If you need to print pages of the book, you may find that printing them from Chrome results in oddly-formatted pages. You will get better-formatted pages if you print using either Safari or Firefox as your browser. If using Safari, go the the Safari ...
What are the boxes and whiskers in a boxplot?
What are the boxes and whiskers in a boxplot? We use boxplots to show the distribution of data mainly through four quartiles (Q1, Q2, Q3, Q4). The boxplot has two whiskers (Q1, Q4), two smaller boxes (Q2, Q3) and a larger central box (Q2, Median, Q3) ...
Try Again Button
A great way to study information is to test yourself on it. Research on testing has shown that testing can help solidify already learned information as well as prepare the brain for learning new information. To help you with this, CourseKata has a ...
Statement on Sex and Gender
Many people use sex and gender interchangeably, but in truth, they’re distinct concepts. Sex is a classification based on biological characteristics, including DNA and anatomy. Gender refers to the socially constructed roles, behaviors, ...
Support Tickets
Support Tickets This book includes an online Help Desk you can use to ask questions, report technical issues, and share your feedback. How to Submit a Ticket You can submit a ticket from within the online textbook or by email. Submit a Ticket from ...
Using the R Sandbox
The R Sandbox The R Sandbox is a separate R window you can use to experiment with R code and play around with ideas from the course. It comes pre-loaded with the base R packages and all of the packages and datasets we reference in the textbook. ...
Popular Articles
tally()
The tally() function will count, or tally, the number of cases that are observed in each category of a variable. Example 1: Use tally() to count the number of observations in each category of a categorical variable. # Use tally() to count the number ...
desc()
The desc() function can be used with the arrange() function to arrange a variable in a data frame in descending order. Example 1: For instance, when we use the arrange() function to sort the Fingers data frame by Thumb, it will sort the values for ...
favstats()
The favstats() function will compute a set of common summary statistics ("favorite stats") for a given variable, including the five-number summary (minimum, Q1, median/Q2, Q3, maximum), the mean, the standard deviation, the sample size (n), and the ...
arrange()
The arrange() function will arrange a data frame by a specific variable, in ascending order. You can use the desc() argument with the arrange() function to arrange the data frame in descending order. NOTE: The arrange() function is similar to the ...
Statement on Sex and Gender
Many people use sex and gender interchangeably, but in truth, they’re distinct concepts. Sex is a classification based on biological characteristics, including DNA and anatomy. Gender refers to the socially constructed roles, behaviors, ...