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Implement one hot coding #79

@strohne

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@strohne

By now, categorical item associations can be evaluated by Cramer's V or NPMI. NPMI requires focusing one value. In addition, add one hot encoding support to unfold values to columns.

  • Implement data_onehot() for unfolding the values.
  • Implement onehot parameter in effect_counts_items_grouped_items().
  • Implement onehot parameter in all other relevant functions.
  • Test

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