Using the `default` Argument in dplyr's Lag and Lead Functions

Understanding Lagging Data with Mutate Verb in R Tidyverse

Calculating Monthly Differences with SQL: Handling Duplicate Months and Applying the LAG Function

Creating New Columns in R: A Practical Guide to Populating Based on Prior Values

Counting Level Changes in Attributes Over Time: A Step-by-Step Guide Using R and dplyr