The ratio estimator
Computes the ratio estimator of the population total.
ratioest(y,x,Tx,pik)
y |
vector of the variable of interest; its length is equal to n, the sample size. |
x |
vector of auxiliary information; its length is equal to n, the sample size. |
Tx |
population total of x. |
pik |
vector of the first-order inclusion probabilities; its length is equal to n, the sample size. |
The function returns the value of the ratio estimator.
data(MU284) # there are 3 outliers which are deleted from the population MU281=MU284[MU284$RMT85<=3000,] attach(MU281) # computes the inclusion probabilities using the variable P85; sample size 120 pik=inclusionprobabilities(P85,120) # defines the variable of interest y=RMT85 # defines the auxiliary information x=CS82 # draws a systematic sample of size 120 s=UPsystematic(pik) # computes the ratio estimator ratioest(y[s==1],x[s==1],sum(x),pik[s==1])
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