| Date: | Wed, 10 Apr 2002 16:05:56 +0100 |
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| Reply-To: | Jeremy Miles <jnvm1@york.ac.uk> |
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| Sender: | "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU> |
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| From: | Jeremy Miles <jnvm1@york.ac.uk> |
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| Subject: | Re: Gender codes |
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| In-Reply-To: | <4FF126AF9EE8D4118D720003470BE9E103BA46E1@exmc4.urmc.roches
ter.edu> |
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| Content-Type: | text/plain; charset="us-ascii"; format=flowed |
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At 15:41 10/04/02, Beckman, Anthony wrote:
>Greetings All
>
>I am looking at some code that was given to me for help in learning SPSS. I
>see within it a few lines of syntax that transforms gender values from 1=
>female and 2 = male to -1 = female and 1 = male.
>
>Any specific reasons why someone might do this? Does it help in running
>regressions?
Yes, using -1 and +1 is a type of coding for using categorical variables in
regression analysis - this is usually referred to as effect coding. Using
this method, the intercept becomes the mean of the DV.
Have a look at a book on regression for more info (or do a web search, that
would probably do the trick).
JM
Jeremy Miles
mailto:jnvm1@york.ac.uk http://www-users.york.ac.uk/~jnvm1/
Department of Health Sciences, University of York, Heslington, York, YO10 5DD
*** New phone number: 01904 321375, *** Mobile: 07941 228018
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