sampling (version 2.1)

rhg: Response homogeneity groups

Description

Computes the response homogeneity groups and the response probability for each unit in these groups.

Usage

rhg(X,selection)

Arguments

X

X is the sample data frame; it should contain the columns 'ID_unit' and 'status'; 'ID_unit' denotes the unit identifier (a number); 'status' is a 1/0 variable denoting the response/non-response of a unit.

selection

vector of variable names used to construct the groups.

Value

• The initial sample data frame and also the following components:
• rhgroup
  the response homogeneity group for each unit.
• prob_response
  the response probability for each unit; for the units with status=0, this probability is 0.

Details

Into a response homogeneity group, the reponse probability is the same for all units. Data are missing at random within groups, conditionally on the selected sample.

References

S�rndal, C.-E., Swensson, B. and Wretman, J. (1992). Model Assisted Survey Sampling. Springer

See Also

rhg_strata, calib

Examples

# defines the inclusion probabilities for the population
pik=c(0.2,0.7,0.8,0.5,0.4,0.4)
# X is the population data frame
X=cbind.data.frame(pik,c("A","B","A","A","C","B"))
names(X)=c("Prob","town")
# selects a sample using systematic sampling
s=UPsystematic(pik)
# Xs is the sample data frame
Xs=getdata(X,s)
# adds the status column to Xs (1 - sample respondent, 0 otherwise)
Xs=cbind.data.frame(Xs,status=c(1,0,1))
# creates the response homogeneity groups using the 'town' variable
rhg(Xs,selection="town")