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The SURVEYSELECT Procedure |
When you specify the ALLOC=NEYMAN option, PROC SURVEYSELECT allocates the total sample size among the strata in proportion to stratum sizes and stratum variances. Neyman allocation is a special case of optimal allocation, where the costs per unit are the same for all strata. For Neyman allocation, the proportion of the total sample size for stratum is computed as
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The target sample size for stratum is
. The
are converted to integer sample sizes
by using a rounding algorithm that requires the sum of the stratum sizes to equal
. The final sample sizes
are required to be at least 1, and the final sample sizes must not exceed the stratum sizes for without-replacement selection methods.
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