"table nsize [aw=weight]"中的[aw=weight]是什么意思

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请教各位前辈命令：“table nsize [aw=weight] , c(mean educ mean isei mean nctot mean pcinc ///   freq”中的[aw=weight]是什么意思，有什么作用。

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关键词：Weight weigh Eight 是什么意思 Table

help weight里有详细说明

aweights, or analytic weights, are weights that are inversely proportional to the variance of an observation;
        that is, the variance of the jth observation is assumed to be sigma^2/w_j, where w_j are the weights.
        Typically, the observations represent averages and the weights are the number of elements that gave rise to
        the average.  For most Stata commands, the recorded scale of aweights is irrelevant; Stata internally rescales
        them to sum to N, the number of observations in your data, when it uses them.

aw是什么意思？