Hi Amit
You cannot do 3 way interactions (i.e., 4 factors including the subject factor) with flexible factorial designs in SPM. The interaction factors in SPM only allow you to list 2 and not 3 numbers.
I have a hack that allows 3-way interactions, but it is an incomplete hack in that some of the displays are wrong although the stats seem correct. I will send it to you off list.
darren
> -----Original Message-----
> From: SPM (Statistical Parametric Mapping)
> [mailto:[log in to unmask]] On Behalf Of Amit Etkin
> Sent: Thursday, July 10, 2008 1:35 AM
> To: [log in to unmask]
> Subject: Re: [SPM] setting up an ANOVA
>
> Hi again,
>
> Thanks for the PDF. I've looked through it, but am
> unfortunately still somewhat confused. For the design matrix
> I previously attached, I have listed the individual column
> designations at the bottom of this email. I'm interested in
> generating, for example, F and T tests for the side x region
> and group x side x region interactions. Could someone suggest
> how to construct the contrast vectors to accomplish this?
>
> many thanks (again)!
>
> Amit
>
>
> 1 'Group_{1}'
> 2 'Group_{2}'
> 3 'Region_{1}'
> 4 'Region_{2}'
> 5 'Side_{1}'
> 6 'Side_{2}'
> 7 'Subject_{1}'
> 8 'Subject_{2}'
> 9 'Subject_{3}'
> 10 'Subject_{4}'
> 11 'Subject_{5}'
> 12 'Subject_{6}'
> 13 'Subject_{7}'
> 14 'Subject_{8}'
> 15 'Subject_{9}'
> 16 'Subject_{10}'
> 17 'Subject_{11}'
> 18 'Subject_{12}'
> 19 'Subject_{13}'
> 20 'Subject_{14}'
> 21 'Subject_{15}'
> 22 'Subject_{16}'
> 23 'Subject_{17}'
> 24 'Subject_{18}'
> 25 'Subject_{19}'
> 26 'Subject_{20}'
> 27 'Subject_{21}'
> 28 'Subject_{22}'
> 29 'Subject_{23}'
> 30 'Subject_{24}'
> 31 'Subject_{25}'
> 32 'Subject_{26}'
> 33 'Subject_{27}'
> 34 'Subject_{28}'
> 35 'Subject_{29}'
> 36 'Subject_{30}'
> 37 'Subject_{31}'
> 38 'Subject_{32}'
> 39 'Subject_{33}'
> 40 'Subject_{34}'
> 41 'Subject_{35}'
> 42 'Subject_{36}'
> 43 'Subject_{37}'
> 44 'Subject_{38}'
> 45 'Subject_{39}'
> 46 'Subject_{40}'
> 47 'Subject_{41}'
> 48 'Subject_{42}'
> 49 'Subject_{43}'
> 50 'Subject_{44}'
> 51 'Subject_{45}'
> 52 'Group*Region_{1,1}'
> 53 'Group*Region_{1,2}'
> 54 'Group*Region_{2,1}'
> 55 'Group*Region_{2,2}'
> 56 'Group*Side_{1,1}'
> 57 'Group*Side_{1,2}'
> 58 'Group*Side_{2,1}'
> 59 'Group*Side_{2,2}'
> 60 'Region*Side_{1,1}'
> 61 'Region*Side_{1,2}'
> 62 'Region*Side_{2,1}'
> 63 'Region*Side_{2,2}'
>
