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4.25

This release adds formulaic as the formula parser and fixes some minor bugs.

* Added formulaic as the preferred formula parser
* Clarified the null in the F-statistic
* Improved the error message when dependent and exog have different numbers of observations
* Fixed a bug in `ACCovariance` estimator where the number of observations was incorrectly overwritten
* Fixed a bug in `PanelResults.corr_squared_between`, `lPanelResults.corr_squared_overall`, and `PanelResults.corr_squared_within` where the correlation was not squared.

4.24

This is a feature release. There are two new features:

- `SystemResults.breusch_pagan` implements the Breusch-Pagan test of 0 correlation (and so a diagonal covariance)
- `SystemResults.likelihood_ratio` implements a likelihood ratio test of a diagonal covariance (and so 0 correlation)

4.23

This release fixes a bug that can affect standard error estimation in `SUR` and related models.

4.22

This is a packaging-only release that fixes an issue with Windows wheels.

4.21

This release fixes a technical issue the prevented wheels from being built. There are no other changes.

4.20

This release fixes a single bug that affected the computation of the first-stage F-statistic.

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