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Date:   Thu, 9 Mar 2000 16:44:23 -0500
Reply-To:   "Thomas J. Sullivan" <toms@RAND.ORG>
Sender:   "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:   "Thomas J. Sullivan" <toms@RAND.ORG>
Organization:   RAND
Subject:   Re: Select A Group of Random Records
Content-Type:   text/plain; charset=us-ascii

*assume you want to randomly select 10 or less (in the event that there are less than 10 in any group) from each group;

data nelson; set nelson; rand_num=ranuni(-5); run;

proc sort data=nelson; by area type; run;

proc rank data=nelson out=ranknels; by area type; rank myrank; run;

data subset; set ranknels; if myrank le 10; *substitute the target number of obs from each group; run;

Nelson Harrison wrote:

> I have a dataset that contains service orders for all of Ontario. > Ontario is broken up into zones and there is 5 different types of > service orders. > > What I need to do is select randomly 10-20 records for each type of > service order for each area. For example, 10-20 > 'vvvv','wwww','xxxx','yyyy','zzzz' records for every area (approx 30 > areas). > > Dataset looks like the following > > Service > Order # Type Area > 123456 xxxx 1 > 234567 yyyy 2 > 345678 vvvv 2 > 456789 zzzz 3 > 567890 wwww 4 > > etc. approx 3-4,000 records > > Thanks > > Nelson

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