sas随机函数

data chance;
input num @@;
code='A01';
cards;
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
;
proc print noobs;
run;

proc surveyselect data=chance method=srs n=5
out=Sample;
run;
data Sample;
set Sample;
random='Sample';
proc sort data=chance; by num; run;
proc sort data=Sample; by num; run;
data final;
merge chance Sample;
by num;
proc print noobs;
run;

---

　　proc surveyselect data=final out=result method = sys samprate=0.9
samprate=(0.1,0.1) outall;/**加一个outall**/
strata=age;
run;
data train valid;
set result;
if selected then output train;
else output valid;
run;