Programming the statistical procedures from SAS

sas proc surveyfreq for unbiased estimate for two stage cluster sampling

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sas proc surveyfreq for unbiased estimate for two stage cluster sampling

hi every one,

i want to ask a question which is about the unbiased estimate for two stage cluster sampling.

for my personal knowledge, the unbiased estimate for two stage cluster sampling can be attained by adding the total element in the population.

however, in sas  proc surveyfreq, when we specify a cluster statement, the total statement is for the total sampling units.

therefore, based on my knowledge that i cannot get a unbiased estimate for the estimate.

the tau of cases now is approaching by the expected sample size in each cluster and multiply the number of cluster.

i want to ask that am I correct?

and is there any possible way to  get the unbiased estimate for two stage cluster sampling.

thx.

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