Date: Wed, 1 Feb 2012 16:34:22 -0800 David Marso "SPSSX(r) Discussion" David Marso Re: 2x2 Latin square design analysis help <1328140953164-5449207.post@n5.nabble.com> text/plain; charset=us-ascii

Well, can you wrap your brain around the following? --- Diet YES Exer YES GROUP=3 Diet YES Exer NO GROUP=1 Diet NO Exer YES GROUP=2 Diet NO Exer NO GROUP=4

SPSS data structure Diet Exercise Dependent variables..... 1 1 ....... 1 0 0 1 0 0

Questions to ask yourself? Were subjects RANDOMLY ASSIGNED to the four groups? If yes then carry on... If NO then you have a big problem. ---- Were there any baseline measures of interest taken BEFORE the intervention? Are they the same variables you measured AFTER the intervention? Affirmative answers to these would suggest somewhat more complicated analyses than either a simple 2x2 ANOVA or regreesion I suggested in my previous reply (Possibly a MIXED model or an (M)ANCOVA).

If so then the question becomes a bit more interesting and more tricky to properly analyze.

Sur1605 wrote > > So, to be clear about the research design, i had four independent groups. > > Group 1: Diet grp > Group 2: Exercise grp > Group 3: Diet+Exercise grp > Group 4: Control grp > > All these are independent groups and i wanted to see the effect of these > treatments on continuous variables like body weight, body fat etc etc > after 12 week of intervention. I have the data, and i was planning on > performing a 2way anova. But i got stuck at the point where i am not > clear on how to put in the data in spss spreadsheet for this particular > test. I want to see if the effect on continuous variable is due to > exercise, deit or their is an interaction effect. > > Hope i explained it well this time. > Sb >

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