Ignoring Missing Values in mapply: A Step-by-Step Guide to Handling NA Values

Filling Missing Values with Repeated Values in R Using dplyr and tidyr

Understanding the Correct Use of the `factor()` Function in R: A Tale of Levels and Labels

Replacing Missing Values in Multiple Columns with NA Using dplyr Package in R

Using R to Recode Numeric Variables: Resolving Unreplaced Values Treated as NA with Package Compatibility