Group By Column A, Find Max of Columns B and C, Then Populate with Value in Column D Using Pandas in Python

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Detecting Non-Stationarity in Time Series Data with R: A Practical Approach to Identifying Time-Invariant Variables

Retrieving the Highest Value for Each Group by Checking Two Columns' Values Using Correlated Subqueries and Aggregation Functions

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Mastering SQL Joins and Grouping: A Comprehensive Guide

Mastering Pandas GroupBy: A Comprehensive Guide to Data Summarization and Analysis