The following PROC SURVEYSELECT statements select a probability sample of customers from the Customers data set according to the stratified sample design. title1 'Customer Satisfaction Survey'; title2 ...

Ideally, when developing stratified medicines ... based on retrospective subset analyses of trial data showing this lack of treatment benefit. The challenge that Amgen and ImClone Systems faced ...

To analyze this stratified sample from a finite population, you need to provide the population totals for each stratum to PROC SURVEYMEANS. The SAS data set named StudentTotal contains the information ...