Repeating Observations by Group in data.table: An Efficient Approach

Creating Random Columns with Tidyr in R: A More Efficient Approach

Generating the Same Random Sample Each Time in a Loop Using Sample_frac

Replacing Inner Joins with Semi Joins in Dplyr: A More Efficient Approach to Data Manipulation

Understanding Floating Point Precision Problems in R: A Deeper Dive

Here is the complete code:

Splitting a Data Frame into Several Columns by Row Value in R Using dplyr and tidyr Libraries

Calculating Group-Level Statistics Excluding a Given Sub-Group in R Using dplyr and purrr Libraries

Understanding Pairwise Complete Observations in Covariance Calculations: A Guide to Correct Handling of Incompatible Dimensions

Creating a Single DataFrame by Aggregating Multiple DataFrames in R Using Nested sapply Functions