Understanding Long-Format Data and the Need for Reshaping Using Pivot_Wider in R Programming Language

Reshaping a Wide Dataframe to Long in R: A Step-by-Step Guide Using Pivot_longer and pivot_wider

Evaluating a Model on Test Data: A Creative Solution Without Group By

Using `mutate()` and `case_when()` to Simplify Complex Data Analysis in Tidy R

Pivoting Data in R Dataframe Using Tidyr, Base R, and data.table