Compute weighted variance

Description

Compute an estimate of a population unit variance from a complex sample with survey weights.

Usage

1
wtdvar(x,w)

Arguments

x

data vector

w

vector of survey weights; must be same length as x

Details

wtdvar is also used by BW3stagePPSe in estimating relvariance components.

Value

numeric estimate of population unit variance

Author(s)

Richard Valliant, Jill A. Dever, Frauke Kreuter

References

Valliant, R., Dever, J., Kreuter, F. (2013, chap. 9). Practical Tools for Designing and Weighting Survey Samples. Springer.

Examples

1
2
3
x <- c(1:3)
wts <- c(4, 6, 8)
wtdvar(x=x, w=wts)

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