# 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 |

### 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 |