Detecting Missing String Values for Specific Groups in a Long-Format Dataset Using R

Understanding Missing Values in R: Techniques for Handling and Classifying Variables

Why replace_na Won't Actually Replace Missing Values Using Dplyr and Piping

Detecting Patterns in Data Frames and Converting to NA Using R with Regular Expressions

Handling Missing Values in DataFrames: A Comprehensive Guide to Boolean Operations and Beyond

How to Insert Rows for Missing Time (Format HH:MM:SS) in R Datasets