R: The gini-index measure

X.gini {RoughSets} | R Documentation

## 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).

[Package RoughSets version 1.3-7 Index]