docs: Add example for aggregating percentage changes in DataTable #3274
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Adds a new documentation section explaining how to properly aggregate percentage changes (e.g., growth rates) using weightedMean with a custom weightCol, rather than a simple average which can be misleading. Fixes #2592
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Description
This PR adds documentation explaining how to properly aggregate percentage changes (e.g., year-over-year growth rates) in DataTable total rows.
Problem
Users needed guidance on how to correctly aggregate percentage changes. A simple average can be misleading when aggregating growth rates across entities of different sizes.
Solution
Added a new "Aggregating Percentage Changes" section to the DataTable documentation that:
Changes
Fixes #2592