# API reference: features & chemometrics

Feature extractors and chemometrics models power FoodSpec workflows. For examples, see the Oil authentication and Mixture tutorials.

## Features
::: foodspec.features.peaks
::: foodspec.features.bands
::: foodspec.features.ratios
::: foodspec.features.fingerprint

## Chemometrics
::: foodspec.chemometrics.pca
::: foodspec.chemometrics.models
::: foodspec.chemometrics.validation
::: foodspec.chemometrics.mixture
::: foodspec.chemometrics.deep
> **Status:** Archived  
> This page has been superseded by the unified API reference. See [api_reference.md](api_reference.md#features-and-ratios) and [api_reference.md](api_reference.md#chemometrics-and-models) for current feature and chemometrics APIs.
