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formulae
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Formulas for mixed-effects models in Python
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formulae
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<img src="docs/logo/formulae_large.png" width=250></img> [](https://badge.fury.io/py/formulae) [](https://codecov.io/gh/bambinos/formulae) [](https://github.com/ambv/black) # formulae formulae is a Python library that implements Wilkinson's formulas for mixed-effects models. The main difference with other implementations like [Patsy](https://github.com/pydata/patsy) or [formulaic](https://github.com/matthewwardrop/formulaic) is that formulae can work with formulas describing a model with both common and group specific effects (a.k.a. fixed and random effects, respectively). This package has been written to make it easier to specify models with group effects in [Bambi](https://github.com/bambinos/bambi), a package that makes it easy to work with Bayesian GLMMs in Python, but it could be used independently as a backend for another library. The approach in this library is to extend classical statistical formulas in a similar way than in R package [lme4](https://CRAN.R-project.org/package=lme4). ## Installation formulae requires a working Python interpreter (3.8+) and the libraries NumPy, SciPy and Pandas with versions specified in the [pyproject.toml](https://github.com/bambinos/formulae/blob/master/pyproject.toml) file. Assuming a standard Python environment is installed on your machine (including pip), the latest release of formulae can be installed in one line using pip: `pip install formulae` Alternatively, if you want the development version of the package you can install from GitHub: `pip install git+https://github.com/bambinos/formulae.git` ## Documentation The official documentation can be found [here](https://bambinos.github.io/formulae) ## Notes - The `data` argument only accepts objects of class `pandas.DataFrame`. - `y ~ .` is not implemented and won't be implemented in a first version. However, it is planned to be included in the future.
