How to select 10% of 'M' and 50% of 'F' from the dataset sashelp.class?
If random number is < than 10 then output, else remove:
http://blogs.sas.com/content/iml/2011/08/24/how-to-generate-random-numbers-in-sas.html
check
data class;
set sashelp.class;
run;
proc sort data=class;by sex;run;
proc surveyselect data=class samprate=(0.1 0.5) out=want;
strata sex;
run;
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