Summary of dplyr: A Comprehensive Guide to Summary Over Combinations of Factors

Efficient Data Analysis: A Function to Summarize Columns After Filtering

Using Dplyr to Summarize Ecological Survival Data: A Practical Guide to Complex Data Analysis in R

Summarize Variables in a data.table using Objects: Two Solutions for Efficient Data Manipulation

Grouping Multicode Question Responses by Month Using R with dplyr and tidyr