sampiling studetns from K out of N schools by 3 stratum leves? Options Thursday I would be very happy to help. First, note that my DATA is registered to every student in a classroom within a school. My goal is to randomly sample K out of N schools in distict school And in each out of the K school, I want to sample to each level of the sample stratum1, a different number of students When at 2 levels of the stratum1 we will randomly sample 4 students and at the third level we will sample 5 students. I think to split the sample so that: 1- Samples K distinct schools from N schools: proc sort data=my_data ; by school;run; data my_data ;set my_data ; by school; /*Placing a random number for school and for students*/ retain uSchool 0; if first.school then uschool=ranuni(12222154); ustudent=ranuni(8744); run; proc sql; ctreate table distinct_schools as select distinict school,uschool,stratum1, stratum2 , stratum3, stratum4 from my_data; quit; proc sort data=distinct_schools ; by uschool;run; proc surveyselect data=distinct_schools out=K_schools outsorting=k_schools_sort method=srs sampsize=60 seed=1234; control stratum2 stratum3 stratum4; run; 2- and perform another sample, sample 4 students from the 2 levels of stratum1 and at the third level we will sample 5 students. of 4 ostudents from the K schools for the two tiers separately. proc sql; create table Students_frame as select a.school,b.* from distinct_schools as a left join my_data as b on a.school=b.school; quit; proc sort data=Students_frame; by uSchool ustudent stratum1;run; proc surveyselect data=Students_frameout=Students_sample outsorting=sort_Students_sample method=srs sampsize=( 4 4 5) seed=323161; strata uschool stratum1; control stratum2 stratum3 stratum4; run; Do you have another suggestion that you do the sampling in one stroke and not split in two?
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