## Managing Multiple Tables with `Statistics`

Use `Statistics` to group tables:

```js
const stats = new Statistics();
stats.addTable("Sales").addColumn("Revenue", [100, 200, 300]);
stats.addTable("Costs").addColumn("Expenses", [50, 100, 150]);

stats.filterRows([1]); // Filters all tables
const statsMeans = stats.descriptive("mean");
console.log(statsMeans.columns["Sales"].values[0]); // 200
```

- **Methods:**
  - `filterRows(indexes)`: Applies to all tables.
  - `clearRowsFilters(indexes)`, `clearAllRowsFilters()`: Clears filters across tables.

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