Local Suppression

Description

A simple method to perfom local suppression.

Usage

localSupp(obj, threshold = 0.15, keyVar)

Arguments

Details

Values of high risk (above the threshold) of a certain variable (parameter keyVar) are suppressed.

Value

an updated object of class freqCalc or the sdcMicroObj-class object with manipulated data.

Author(s)

Matthias Templ and Bernhard Meindl

References

Templ, M. Statistical Disclosure Control for Microdata Using the R-Package sdcMicro, Transactions on Data Privacy, vol. 1, number 2, pp. 67-85, 2008. http://www.tdp.cat/issues/abs.a004a08.php

Templ, M. Statistical Disclosure Control for Microdata: Methods and Applications in R. Springer International Publishing, 287 pages, 2017. ISBN 978-3-319-50272-4. doi: 10.1007/978-3-319-50272-4 doi: 10.1007/978-3-319-50272-4

See Also

freqCalc, indivRisk

Examples

## example from Capobianchi, Polettini and Lucarelli:
data(francdat)
keyVars <- paste0("Key",1:4)
## Not run: 
# dontrun because Examples with CPU time > 2.5 times elapsed time
f <- freqCalc(francdat, keyVars=keyVars,w=8)
f
f$fk
f$Fk
## individual risk calculation:
indivf <- indivRisk(f)
indivf$rk
## Local Suppression
localS <- localSupp(f, keyVar="Key4", threshold=0.15)
f2 <- freqCalc(localS$freqCalc, keyVars=keyVars, w=8)
indivf2 <- indivRisk(f2)
indivf2$rk
identical(indivf$rk, indivf2$rk)

## select another keyVar and run localSupp once again,
# if you think the table is not fully protected

## for objects of class sdcMicro:
data(testdata)
sdc <- createSdcObj(testdata,
  keyVars=c('urbrur','roof','walls','water','electcon','relat','sex'),
  numVars=c('expend','income','savings'), w='sampling_weight')
sdc <- localSupp(sdc, keyVar='urbrur', threshold=0.045)
print(sdc, type="ls")

## End(Not run)