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

Improving Code Quality: A Detailed Review of a C++-Style R Function for Rolling Window Calculation

Creating Subset of Data Table in R Based on Another Column Condition Using dplyr Library

Converting a Data.Frame to a Multidimensional Array in R Using reshape2 Package

Calculating Standardized Distance Measures on Subset of Data Without First Saving Subset as New DataFrame

Joining Two Time-Series in a Single Function Using R Programming Language