```Date: Tue, 6 Nov 2007 09:45:24 -0800 Reply-To: King Douglas Sender: "SPSSX(r) Discussion" From: King Douglas Subject: Re: Randomization into 3 groups Comments: To: "Parise, Carol A." In-Reply-To: <5E0F889A8147254F83D0250D0E7CE6C66C130D@DCSH15VX.root.sutterhealth.org> Content-Type: text/plain; charset=iso-8859-1 Carol, Here are two nifty solutions, one provided by Jan Spousta, the other by Raynald Levesque and both posted to this list just a few weeks ago. I'm sure that either will prove useful, given slight modifications. Regards, King Douglas American Airlines Customer Research http://www.kingdouglas.com/SPSS.HTM JAN SPOUSTA: Run the following syntax from a Syntax window (Run -> All) ; suppose you have opened a datafile with 96 rows: COMPUTE aux_id = \$casenum /*to be able to restore the original order of rows*/. COMPUTE random_number = uniform(1) . SORT CASES BY random_number (A) . compute random_number = \$casenum /*to convert the random numbers from <0,1> into 1, 2, 3..., N */. compute random_group = mod(random_number, 3) + 1 /* create 3 groups */. SORT CASES BY aux_id (A) . formats random_group aux_id random_number (f6). var lab random_group "Random group". Results are in the variable random_group. Hope this helps Jan RAYNALD LEVESQUE: Here is one method: * Create a sample file for illustration purspoes. INPUT PROGRAM. LOOP id=1 TO 96 . - END CASE. END LOOP . END FILE. END INPUT PROGRAM. * Do the job. COMPUTE draw=UNIFORM(1). SORT CASES BY draw. RANK VARIABLES=draw /NTILES(3) INTO group . Regards -- Raynald Levesque www.spsstools.net "Parise, Carol A." wrote: Hi all, Does anyone have some nifty code to tell SPSS to do the following: 1. Create a variable called ID and assign ID numbers 1-315. 2. Create a variable called Group and randomly assign a 1, 2, or 3 to each of the 315 IDs so that 105 cases get a 1, 105, get a 2 and 105 get a 3. I've used UNIFORM to randomly assign a list to either a 1 or 0 and i could easily create these variables and mannually do this. However, seeing the syntax to do this would be valuable for some other tasks like this. Thanks Carol ===================== To manage your subscription to SPSSX-L, send a message to LISTSERV@LISTSERV.UGA.EDU (not to SPSSX-L), with no body text except the command. To leave the list, send the command SIGNOFF SPSSX-L For a list of commands to manage subscriptions, send the command INFO REFCARD ===================== To manage your subscription to SPSSX-L, send a message to LISTSERV@LISTSERV.UGA.EDU (not to SPSSX-L), with no body text except the command. To leave the list, send the command SIGNOFF SPSSX-L For a list of commands to manage subscriptions, send the command INFO REFCARD ```

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