---
title: "fitted(to:eventHandler:)"
framework: createmlcomponents
role: symbol
role_heading: Instance Method
path: "createmlcomponents/columnselector/fitted(to:eventhandler:)"
---

# fitted(to:eventHandler:)

Fits a transformer to a data frame

## Declaration

```swift
func fitted(to input: DataFrame, eventHandler: EventHandler? = nil) async throws -> ColumnSelector<Estimator, UnwrappedInput>.Transformer
```

## Parameters

- `input`: A data frame.
- `eventHandler`: An event handler.

## Return Value

Return Value The fitted transformer.

## See Also

### Fitting a transformer

- [ColumnSelector.Input](createmlcomponents/columnselector/input.md)
- [ColumnSelector.Output](createmlcomponents/columnselector/output.md)
- [Transformer](createmlcomponents/transformer.md)