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4.15.2

This release fixes a small number of bugs, adds new measure of model fit, and provides some essential maintenance:

* Blackened the code.
* Added McElroy's and Berndt's measures of system fit.
* Removed support for Python 3.5 inline with NEP-29.
* Fixed a packing error in 4.15.1

4.15.1

This release fixes a small number of bugs, adds new measure of model fit, and provides some essential maintenance:

* Blackened the code.
* Added McElroy's and Berndt's measures of system fit.
* Removed support for Python 3.5 inline with NEP-29.
* Fixed a packing error in 4.15

4.15

This release fixes a small number of bugs, adds new measure of model fit, and provides some essential maintenance:

* Blackened the code.
* Added McElroy's and Berndt's measures of system fit.
* Removed support for Python 3.5 inline with NEP-29.

4.14

This release fixes a small number of bugs and provides some essential maintenance:

* Fixed issue where datasets were not installed with wheels.
* Switched to property-cached to inherit cached property from property.
* Removed all use pandas.Panel.

4.13

This is a feature and bug release.

* Added `AbsorbingLS` which allows a large number of variables to be absorbed. This model can handle very high-dimensional dummy variables and has been tested using up to 1,000,000 categories in a data set
with 5,000,000 observations.
* Fixed a bug when estimating weighted panel models that have repeated observations (i.e., more than one observation per entity and time id).
* Added ``drop_absorbed`` option to `PanelOLS` which automatically drops variables that are absorbed by fixed effects.
* Added optional Cythonized node selection for dropping singletons
* Added preconditioning to the dummy variable matrix when ``use_lsmr=True`` in `fit`. In models with many effects, this can reduce run time by a factor of 4 or more.

4.12

Highlights of this release include:

* Dropping singleton observations in PanelOLS models
* Support for LSMR as an option to estimate parameters. LSMR can be much faster in very sparse unbalanced panels.
* Added wald_test to panel model results class.
* Added a low-memory option to limit memory usage when estimating models with 2 effects.

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