when to use post stratification weights in r? why should post-stratification weights be used in statistica do survey post stratification weights work when using post stratification weights why are weights used in r why should i use weights in post stratification when are post stratification weights used why use pre stratification weighting why does a random sample use probability weights when estimating variance? when is post stratification used what is post stratification for sample how do you use post stratification weighting for random sampling? why use post stratification weights in statistics when are weights used in r when to use post stratification weights when is the post stratification weight used which weight should i use for variance what are post stratification weights used for when should post stratification weigh why use post stratification weights as variance weighting