From a model based perspective, we are interested in estimating the variance of the weighted mean when the different are not i.i.d random variables. An alternative perspective for this problem is that of some arbitrary sampling design of the data in which units are selected with unequal probabilities (with replacement).
From a model based perspective, we are interested: in estimating the varian.ce of the weighted mean when the different a:re not i.i.d random variables. An alternative perspective for this problem is that of some arbitrary sampling design of the data in which? units are selected with unequal probabilities (with replacement).