Data Manipulation and Filtering in R: A Case Study on Multiplying Column Values within a Date Range While Replacing Old Values

Counting Columns Using R Based on Two Different Conditions: A Beginner's Guide

Reordering a Factor in R Based on Values Corresponding to a Specific Level of a Subfactor of the Original Factor

Manipulating Pandas DataFrames with Conditions and GroupBy

Solving the Issue with `str_replace_all` and `as.character` in the `mutate` Function in R.

Data Manipulation in R: Merging Data from Two DataFrames with Multiple Conditions Using dplyr and Base R

Creating a New Dummy Variable Based on Existing Dummy Variable Values in R using dplyr Package

Selecting Rows with Given Conditions and Applying Transformations in Pandas Dataframes

Conditional Ratio with Group By in Pandas: A Step-by-Step Solution

Conditional Panels in Shiny: Understanding the Behavior of `.Platform$OS.type`