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Py-formulaic

Jul 20, 2023

Implementation of Wilkinson formulas

Formulaic is a high-performance implementation of Wilkinson formulas for Python.

It provides

  • high-performance dataframe to model-matrix conversions.
  • support for reusing the encoding choices made during conversion of one data-set on other datasets.
  • extensible formula parsing.
  • extensible data input/output plugins, with implementations for
    • input
      • pandas.DataFrame
      • pyarrow.Table
    • output
      • pandas.DataFrame
      • numpy.ndarray
      • scipy.sparse.CSCMatrix
  • support for symbolic differentiation of formulas and hence model matrices.
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