States with Largest Difference Between Highest and Lowest Costing 4-Year Colleges 2018-2019

Converting Data Frames into Time Series: A Step-by-Step Guide Using lubridate in R

Selecting Rows by Criteria Connected with Two Tables

Using the Extract Function from the tidyr Package to Separate Text in R

Adding Conditional Columns with Letters in R Based on Hierarchical Conditions Using dplyr Library