Date: Wed, 2 Dec 1998 10:09:59 -0600
Reply-To: "Nichols, David" <nichols@SPSS.COM>
Sender: "SPSSX(r) Discussion" <SPSSX-L@UGA.CC.UGA.EDU>
From: "Nichols, David" <nichols@SPSS.COM>
Subject: Re: Fractional Factorials
It's not clear to me whether or not the design will allow you to get what
you want. I think there's a pre-software issue here of what the design is
and what's available from it. I can tell you how to make SPSS produce a
particular analysis if I know what that analysis is (assuming that it can be
done), but you have to be able to specify that precisely. A matching
textbook example is always a good way to handle this, if it can be found.
David Nichols
Principal Support Statistician and
Manager of Statistical Support
SPSS Inc.
> -----Original Message-----
> From: Claudia Stanny [SMTP:cstanny@UWF.EDU]
> Sent: Monday, November 30, 1998 8:45 AM
> To: SPSSX-L@UGA.CC.UGA.EDU
> Subject: Fractional Factorials
>
> My problem is a bit more complicated than simple unpacking of the
> counterbalancing will take care of. I used two stimuli (counterbalanced)
> in
> each of two conditions. Both create an effect. When I arranged the data
> to treat order (Stimulus 1/Cond A-Stimulus 2/Cond B; Stimulus 2/ Cond
> A-Stimulus 1/Cond B) as a between-subjects factor, I got weird
> interactions
> that reflect the confounding of the effects of stimuli and conditions. I
> would like to be able to pull out the main effect of stimuli as well as
> the
> effect of condition, if this is possible. I suppose I could rearrange the
> data file so that the order effect reflects the contrast between stimuli
> rather than conditions and rerun it, just to satisfy myself about the
> effects of the stimuli. (The effects of conditions are, of course, my
> primary interest.)
> ___________________________________________________
> Claudia J. Stanny, Ph.D. e-mail: cstanny@uwf.edu
> Department of Psychology Phone: (850) 474 - 3163
> University of West Florida FAX: (850) 857 - 6060
> Pensacola, FL 32514 - 5751
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