Rolling Time Window with Distinct Count in Big SQL using DENSE_RANK() Function

Sampling from a Known Distribution Under a Rejection Criterion: A Geometric Distribution Approach

Counting Unique Values in a Categorical Column by Group: A Deep Dive into R and Data Analysis

Creating a New Column with Variable Names Based on Presence in Data Frame: A Comparative Analysis of Regular Expressions and Apply Functions

Mastering SQL Count then Sum Operations: A Step-by-Step Guide to Analyzing Data with Aggregate Functions

Counting Frequencies of Values in Two Columns Using R