Melanie, If you have access to www.dejanews.com, you can search the newsgroup (forum) comp.soft-sys.sas and find several excellent examples of SAS programs for rough and exact samples with and without replacement.

> ---------- > From: Melanie Barish[SMTP:MelliJ@AOL.COM] > Reply To: MelliJ@AOL.COM > Sent: Thursday, October 01, 1998 4:06 PM > To: SAS-L@UGA.CC.UGA.EDU > Subject: random sample selection > > Hello everyone! Can anyone give me some suggestions as to the proper code > for > a random sample selection. Thus far, at the recommendation of a > co-worker, I > have used a ranuni command, followed by a data step with a retain > statement. > However, when attempting to select a 20% random sample, I am not getting > exactly 20%. For instance, when I select 20% of a data set that contains > 36 > observations, I get 9 observations. Thanks for the help... > > Melanie Barish > Sr. Data Analyst > IPRO > Lake Success, NY > MelliJ@aol.com >