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Date:         Thu, 24 Oct 2002 14:25:39 -0400
Reply-To:     David Greenberg <dg4@nyu.edu>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         David Greenberg <dg4@nyu.edu>
Subject:      Re: regression models
Comments: To: "kalanda@liverpool.ac.uk" <bkalanda@yahoo.com>
Content-Type: text/plain; charset=windows-1252

Merge the two data stes. Crete a dummy variable that is 0 for those in the first data set, and 1 for those in the second. Regress y on x, the dummy variable, and the product of the dummy with x. Significance tests for the dummy and for the interaction term will answer the question for whether a is significantly different from c, and whether b is significantly different from d. David Greenberg, Sociology Department, New York University.

----- Original Message ----- From: "kalanda@liverpool.ac.uk" <bkalanda@yahoo.com> Date: Thursday, October 24, 2002 4:38 am Subject: regression models

> Dear all, > I have two regression models: > y= a + bx > y= c+ dx > How do i test the hypotheses that > a is equal to c AND > b is equal to d > I would like to do that either through code or menus. > > Boniface Kalanda > Liverpool School of Tropical Medicine > > > Raynald Levesque <rlevesque@videotron.ca> wrote:Hi > > Is this what you are looking for? > > > DATA LIST LIST /persnr Spellnr spelltyp. > BEGIN DATA > 101 1 4 > 101 2 3 > 101 3 1 > 102 1 4 > 102 2 1 > 102 3 3 > 102 4 1 > 103 1 4 > 103 2 1 > END DATA. > LIST. > > SORT CASES BY persnr spellnr. > COMPUTE spell3=(spelltyp=3). > > DO IF $CASENUM=1. > - COMPUTE flag=spell3. > ELSE IF persnr=LAG(persnr). > - COMPUTE flag= MAX(LAG(flag),spell3). > END IF. > EXECUTE. > SELECT IF flag=1. > > Raynald Levesque rlevesque@videotron.ca > Visit my SPSS Pages http://pages.infinit.net/rlevesqu/index.htm > > > > -----Original Message----- > From: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU]On > Behalf Of > Andrea Schaefer > Sent: October 23, 2002 1:02 PM > To: SPSSX-L@LISTSERV.UGA.EDU > Subject: Questions about setting up a data set > > > Hi everyone! > > I have a questions regarding the shape of my data set. > I have a data file which contains serveral spells per person. It looks > like that: > > persnr Spellnr spelltyp > > 101 1 4 > 101 2 3 > 101 3 1 > 102 1 4 > 102 2 1 > 102 3 3 > 102 4 1 > 103 1 4 > 103 2 1 > > > Now my question: I like to extract all the persons how experienced at > least one spell of spelltyp 3 and I want to keep the following > spell(typ)-(after spelltyp 3). > > Thank you in advance. I greatly appreciate any advice! > > Andrea Schäfer > > > --------------------------------- > Do you Yahoo!? > Y! Web Hosting - Let the expert host your web site >


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