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

# fitted(to:validateOn:eventHandler:)

Fits a transformer to a data frame

## Declaration

```swift
func fitted(to input: DataFrame, validateOn validation: DataFrame?, eventHandler: EventHandler?) async throws -> Self.Transformer
```

## Parameters

- `input`: A data frame containing examples used for fitting the transformer.
- `validation`: A data frame containing examples used for validating the fitted transformer.
- `eventHandler`: An event handler.

## Return Value

Return Value The fitted transformer.

## See Also

### Fitting

- [fitted(to:validateOn:)](createmlcomponents/supervisedtabularestimator/fitted(to:validateon:).md)