extendChi2: Discretization of Numeric Attributes using the Extended Chi2...

In discretization: Data Preprocessing, Discretization for Classification

Discretization of Numeric Attributes using the Extended Chi2 algorithm

Description

This function implements Extended Chi2 discretization algorithm.

Usage

extendChi2(data, alp = 0.5)

Arguments

data	data matrix to discretized dataset
alp	significance level; α

Details

In the extended Chi2 algorithm, inconsistency checking(InConCheck(data) < δ) of the Chi2 algorithm is replaced by the lease upper bound ξ(Xi()) after each step of discretization (ξ_{discretized} < ξ_{original}). It uses as the stopping criterion.

Value

cutp	list of cut-points for each variable
Disc.data	discretized data matrix

Author(s)

HyunJi Kim [e-mail]

References

Su, C. T. and Hsu, J. H. (2005). An Extended Chi2 Algorithm for Discretization of Real Value Attributes, IEEE transactions on knowledge and data engineering, 17, 437–441.

See Also

chiM, Xi

Examples

data(iris)
ext=extendChi2(iris,0.5)
ext$cutp
ext$Disc.data

discretization documentation built on June 9, 2022, 5:09 p.m.