extendChi2: 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; \(\alpha\)
Value
cutp
list of cut-points for each variable
Disc.data
discretized data matrix
Details
In the extended Chi2 algorithm, inconsistency checking(\(InConCheck(data) < \delta\)) of the Chi2 algorithm is replaced by the lease upper bound \(\xi\)(Xi()) after each step of discretization (\(\xi_{discretized} < \xi_{original}\)).
It uses as the stopping criterion.
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.