sdcMicro (version 2.0.4)

freqCalc: Frequencies calculation for risk estimation

Description

Fast computation of frequencies (counts) with which is needed for risk estimation.

Usage

freqCalc(x, keyVars = 1:3, w = 4)

Arguments

x

data frame or matrix

keyVars

key variables

w

column index of the weight variable. Should be set to NULL if one deal with the whole population.

Value

• Object from class freqCalc.
• freqCalc
  data
• keyVars
  keyVars
• w
  index of weight vector. NULL if you do not a sample.
• indexG
• fk
  the frequency of equal observations in the key variables subset sample given for each observation.
• Fk
  estimated frequency in the population
• n1
  amount of observations with fk=1
• n2
  amount of observations with fk=2

Details

The function considers the case of missing values in the data. A missing value stands for any of the possible categories of the variables considered.

References

look e.g. in http://neon.vb.cbs.nl/casc/Deliv/12d1.pdf

See Also

indivRisk

Examples

data(francdat)
f <- freqCalc(francdat, keyVars=c(2,4,5,6),w=8)
f
f$freqCalc
f$fk
f$Fk
## with missings:
x <- francdat
x[3,5] <- NA
x[4,2] <- x[4,4] <- NA
x[5,6]  <- NA
x[6,2]  <- NA
f2 <- freqCalc(x,  keyVars=c(2,4,5,6),w=8)
f2$Fk