E1. To be completed after lesson 10

Exercise 1.1

What is split-apply-combine and why is it important that a data set is tidy when doing split-apply-combine operations?

What is the difference between joining and concatenating data frames?

Describe the difference between categorical and quantitative variables. How are they fundamentally different in the way we plot them?

Give pros and cons for using a histogram for display of repeated measurements. Then give pros and cons for using an ECDF.

Write down any questions or points of confusion that you have.