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docs: Add example for aggregating percentage changes in DataTable #3274

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19 changes: 19 additions & 0 deletions sites/docs/pages/components/data/data-table/index.md
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Expand Up @@ -368,6 +368,25 @@ limit 5
```
</DocTab>

#### Aggregating Percentage Changes

When aggregating percentage changes (e.g., year-over-year growth rates) in a total row, a simple average can be misleading. Instead, use `totalAgg=weightedMean` with a `weightCol` to calculate a properly weighted average.

For example, to aggregate growth rates weighted by the size of each entity (e.g., GDP):

```svelte
<DataTable data={sales_data} totalRow=true>
<Column id=region/>
<Column id=revenue fmt=usd/>
<Column id=growth_rate
title="Y/Y Growth"
fmt=pct2
totalAgg=weightedMean
weightCol=revenue/>
</DataTable>
```

In this example, regions with higher revenue contribute more to the overall growth rate calculation, giving you an accurate weighted average.


#### Custom Aggregations Values
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