See how to join two data sets by one or more common columns using base R’s merge function, dplyr join functions, and the speedy data.table package.

We often want to “subset” our data. That is, we only want to look at data for a certain year, or from a certain class products or customers. We generally call this process “filtering” in Excel or ...

Lesson 4 Filtering Data We often want to “subset” our data. That is, we only want to look at data for a certain year, or from a certain class products or customers. We generally call this process ...