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]