Modifying Values in a DataFrame Based on Another Column

Using Logical Expressions with the memisc Package: Best Practices and Alternatives

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

Pandas Efficiently Selecting Rows Based on Multiple Conditions

Data Filtering with a Moving Window in R Using the zoo Package

Matching Cells in DataFrames: A Step-by-Step Guide for Efficient Data Manipulation

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

Looping Through Pandas DataFrames: Understanding the `iterrows` Method and Its Limitations