# fitted(to:validateOn:eventHandler:) Fits a linear regressor model to a sequence of examples. ``` func fitted(to input: Input, validateOn validation: Validation, eventHandler: EventHandler? = nil) async throws -> LinearRegressorModel where Input : Sequence, Validation : Sequence, Input.Element == AnnotatedFeature, Scalar>, Validation.Element == AnnotatedFeature, Scalar> ``` ## Parameters `input` A sequence of examples used for fitting the regressor. `validation` A sequence of examples used for validating the fitted regressor. `eventHandler` An event handler. This method reports maximum error and root-mean-square error metrics. ## Return Value The fitted linear regressor model. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)