var_Hajek {UPSvarApprox} | R Documentation |
Hájek Approximate Variance Estimator
Description
Compute an approximate variance estimate using the approximation of joint-inclusion probabilities proposed by Hájek (1964). Estimator of class 2, it requires only first-order inclusion probabilities and only for sample units.
Usage
var_Hajek(y, pik)
Arguments
y |
numeric vector of sample observations |
pik |
numeric vector of first-order inclusion probabilities for sample units |
Value
a scalar, the estimated variance
[Package UPSvarApprox version 0.1.4 Index]