X.gini {RoughSets}

The gini-index measure

Description

An auxiliary function for the qualityF parameter in the FS.greedy.heuristic.reduct.RST, FS.DAAR.heuristic.RST and FS.greedy.heuristic.superreduct.RST functions. It is based on the gini index as a measure of information (Stoffel and Raileanu, 2000).

Usage

X.gini(decisionDistrib)

Arguments

decisionDistrib

an integer vector corresponding to a distribution of attribute values.

Value

a numeric value indicating the gini index of an attribute.

Author(s)

Andrzej Janusz

References

K. Stoffel and L. E. Raileanu, "Selecting Optimal Split-Functions with Linear Threshold Unit Trees and Madaline-Style Networks", in: Research and Development in Intelligent Systems XVII, BCS Conference Series (2000).