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samples are drawn from each stratum. Neyman allocation determines the sample size n_h for each stratum h that minimizes the variance of the estimated population mean or total.The Neyman allocation formula is:
:where:
* n_h is the sample size for stratum h
* n is the total sample size
* N_h is the population size for stratum h
* S_h is the standard deviation of the variable of interest in stratum h
* ? represents the sum over all strata

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