问个PROC SURVEYSELECT的问题

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收藏 2010-06-17

请问如果有PROC SURVEYSELECT 的时候，如果不知道SAMPLESIZE,只知道每个GROUP要取出50%的，该如何处理呢？

PROC SURVEYSELECT DATA = A OUT =B SAMPSIZE =???? SEED = 12345;
STRATA CLASS; /*我需要每个CLASS中都取50%的SAMPLE*/
ID _ALL_;
RUN;

非常感谢！！

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bobguy

2010-6-17 06:32:46

rockfido 发表于 2010-6-17 00:51
请问如果有PROC SURVEYSELECT 的时候，如果不知道SAMPLESIZE,只知道每个GROUP要取出50%的，该如何处理呢？

PROC SURVEYSELECT DATA = A OUT =B SAMPSIZE =???? SEED = 12345;
STRATA CLASS; /*我需要每个CLASS中都取50%的SAMPLE*/
ID _ALL_;
RUN;

非常感谢！！

As long as you know the levels of class variable, you can specify the sample rate as,

SAMPRATE =(0.5 0.5 0.5 0.5 0.5)

in the example below.

data a;
do i = 1 to 500;
class=ceil(ranuni(123)*5);
output;
end;
run;

proc sort data=a; by class; run;

PROC SURVEYSELECT DATA = a OUT =b SAMPRATE =(0.5 0.5 0.5 0.5 0.5) SEED = 12345;
STRATA CLASS;
RUN;

proc print; run;

proc freq data=a;
table class;
run;

proc freq data=b;
table class;
run;