Date:         Sat, 8 Nov 1997 21:40:57 -0600
Reply-To:     mberger@STATS.GOVT.NZ
Sender:       "SAS(r) Discussion" <SAS-L@UGA.CC.UGA.EDU>
From:         mberger@STATS.GOVT.NZ
Subject:      Re: Random

Try this in SAS for selecting Simple Random Samples without Replacement
(SRSWOR).
 
You can use RANUNI as a function to get random numbers.  RANUNI(0) uses the
current clock/time as a seed.
 
So, if your population data is in POP, and you want to select 1,000
observations SRSWOR, do the following;
 
DATA POP;
     SET POP;
     X=RANUNI(0);
 
PROC SORT DATA=POP;
     BY RANUNI;
 
DATA SAMP;
     SET POP;
     BY RANUNI;
     N+1;   *** This is simply a sample counter;
     IF N LE 1000 THEN OUTPUT;
 
You could probably make this more efficient but this should give the general
idea.