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# Internal Classes

## Introduction

The following summarizes classes and functions that are not intended to be directly used, but of interest only for internal use or for a developer who wants to extend on existing model classes.

## Module Reference

### Model and Result Classes

These are the base classes for both the estimation models and the results. They are not directly useful, but layout the structure of the subclasses and define some common methods.

`Model`(endog[, exog]) | A (predictive) statistical model.
`LikelihoodModel`(endog[, exog]) | Likelihood model is a subclass of Model.
`Results`(model, params, **kwd) | Class to contain model results ..
`LikelihoodModelResults`(model, params[, ...]) | Class to contain results from likelihood models ..

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