Merging Dataframes without Duplicating Columns: A Guide with Left and Outer Joins

Updating Missing Values in Pandas DataFrames: A Step-by-Step Guide

Iterating Over Multiple DataFrame Rows in Pandas: Efficient Methods for Data Manipulation and Analysis

Replacing Missing Country Values with the Most Frequent Country in a Group Using dplyr, data.table and Base R

Grouping Consecutive Rows in Time Series Data Using R

Calculating the Average of Multiple Entries with Identical Names Using R.

Merging and Updating Multiple Columns in a Pandas DataFrame During Merges When Matched on a Condition

Calculating Years Before First Blackout Occurrence in R

Unlisting an Arbitrary Level in R Nested List

Multiplying Data Frame Cells with Weights Using Dplyr