ce.mimp {dprep}R Documentation

Mean or median imputation

Description

A function that detects the location of missing values by class, then imputes the missing values that occur in the features, using mean or median imputation, as selected by the user. If the feature is nominal then imputation is done using the mode.

Usage

ce.mimp(w.cl, method = c("mean", "median"), atr, nomatr = 0)

Arguments

w.cl dataset with missing values.
method either "mean" or "median"
atr list of relevant features
nomatr list of nominal features, imputation is done using mode

Value

w.cl the original matrix with values imputed

Note

A description of all the imputations carried out may be stored in a report that is later saved to the current workspace. To produce the report, lines at the end of the code must be uncommented. The report objects name starts with Imput.rep.

Author(s)

Caroline Rodriguez and Edgar Acuna

References

Acuna, E. and Rodriguez, C. (2004). The treatment of missing values and its effect in the classifier accuracy. In D. Banks, L. House, F.R. McMorris, P. Arabie, W. Gaul (Eds). Classification, Clustering and Data Mining Applications. Springer-Verlag Berlin-Heidelberg, 639-648.

Examples

data(hepatitis)
#--------Mean Imputation---------- 
hepa.mean.imp=ce.impute(hepatitis,"mean",1:19)

[Package dprep version 2.0 Index]