sdcMicro (version 4.6.0)

groupVars: Join levels of a keyVariable in an object of class sdcMicroObj-class

Description

Transforms the factor variable into a factors with less levels and recomputes risk.

Usage

groupVars(obj, var, before, after)

Arguments

obj

object of class sdcMicroObj-class

var

name of the keyVariable to change

before

vector of levels before recoding

after

vector of levels after recoding

Value

the modified sdcMicroObj-class

Methods

list("signature(obj = \"sdcMicroObj\")")

This method transform a factor variable with some levels into a new factor variable with less levels. The user must make sure that all levels of the original variable are listed in argument 'before' and that the number of elements in argument 'after' (the new levels) have the same length. This means that there should be a one to one mapping from any level of the original factor to a level in the recoded variable.

Examples

## for objects of class sdcMicro:
data(testdata2)
testdata2$urbrur <- as.factor(testdata2$urbrur)
sdc <- createSdcObj(testdata2,
  keyVars=c('urbrur','roof','walls','water','electcon','relat','sex'),
  numVars=c('expend','income','savings'), w='sampling_weight')
sdc <- groupVars(sdc, var="urbrur", before=c("1","2"), after=c("1","1"))