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

1 | ```
wtdvar(x,w)
``` |

`x` |
data vector |

`w` |
vector of survey weights; must be same length as |

`wtdvar`

is also used by `BW3stagePPSe`

in estimating relvariance components.

numeric estimate of population unit variance

Richard Valliant, Jill A. Dever, Frauke Kreuter

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

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