Merging DataFrames with Different Frequencies: Retaining Values on Different Index DataFrames

Grouping by Date and Counting Unique Groups with Pandas: A Comprehensive Approach

Finding the Maximum Value in a Specific Column While Returning Another Column in Pandas Using Groupby Method

Aggregating a Pandas DataFrame Horizontally: Methods and Techniques

GroupBy Transformation with Pandas in Python: Efficient Data Aggregation Techniques