Thank you for your answers, I tried this one but some errors appear: PROC SURVEYSELECT N=200 SEED=12345 OUT=sample_data METHOD=SRS NOPRINT; STRATA strateDiam3 (Min: 0.375, Mid: 0.375, Max: 0.25) ERROR 22-322: Syntax error, expecting one of the following: a name, ;, -, /, :, DESCENDING, NOTSORTED, _ALL_, _CHARACTER_, _CHAR_, _NUMERIC_. ERROR 76-322: Syntax error, statement will be ignored. FinalDiagnosis (Cancer: 0.3333, Benign: 0.6667); RUN;
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