http://spssx-discussion.165.s1.nabble.com/REPEATED-MIXED-MODELS-post-hoc-tests-contrasts-tp5728007p5728292.html
Hello,
Yes, if I use the mixed menu command that would be the resulting output. Thatʹs the syntax I wrote directly, that‘s why there arentʹt any other specifications. With your syntax I did the analysis but with the unstructured covariance,
MIXED LSRT BY LISTLENGTH gender WITH anx
/CRITERIA=CIN(95) MXITER(100) MXSTEP(10) SCORING(1) SINGULAR(0.000000000001) HCONVERGE(0, ABSOLUTE) LCONVERGE(0, ABSOLUTE) PCONVERGE(0.000001, ABSOLUTE)
/FIXED=LISTLENGTH gender anx LISTLENGTH*anx | SSTYPE(3)
/METHOD=ML
/PRINT=SOLUTION TESTCOV
/RANDOM=INTERCEPT | SUBJECT(COD_subiect) COVTYPE(UN)
/EMMEANS=TABLES(LISTLENGTH) COMPARE ADJ(BONFERRONI)
/EMMEANS=TABLES(gender) COMPARE ADJ(BONFERRONI).
The resulting output shows only sign anxiety effect and interaction, and with list length as a fixed factor I obtain an unsignificant result. Which unfortunately undermines the effect of the interaction because without a sign list length effect there isn't an explanation why the interaction is sign (only with harder list lengths anxiety will have a detrimental effect). However only when I add anxiety the effect of list length becomes insign.
This is the output. Should I use a dummy variable for coding the three levels of list length (L1, L2,L3)? how should I interpret an interaction with three levels when LL3 x anx is set to zero?
Parameter b SE t Sig. Intercept -25,5 297,8 -,086 ,932
[LISTLENGTH=1] 473,5 306,6 1,5 ,124
[LISTLENGTH=2] 597,2 306,7 1,9 ,053
[LISTLENGTH=3] 0a 0 . .
[gender=1] 309.2 99.5 3.1 .002
[gender=2] 0a 0 . .
anx 44,9 8.5 5.2 0.00
[LISTLENGTH=1] * anx -28,2 8,8 -3,1 ,002
[LISTLENGTH=2] * anx -25,6 8,8 -2,8 ,004
[LISTLENGTH=3] * anx 0a 0 . . a. This parameter is set to zero because it is redundant.
b. Dependent Variable: LSRT.
Thanks a lot again for all your help!
Alexandra
On 12/2/14, Maguin, Eugene [via SPSSX Discussion] <
[hidden email]> wrote:
>
>
> You began with data in wide format (something like):
>
> id1 anxiety ls1 ls2 ls3.
>
> I know you are working on menus but the listing should show a varstocases
> command with these elements, although it may have others in addition.
>
> varstocases make ls from ls1 to ls3/index=listlength.
>
> The resulting file WILL have anxiety in it. Specifically the structure will
> be
>
> Id1 anxiety listlength ls
>
> Your basic mixed command will have these elements
>
> mixed ls by listlength with anxiety/fixed=listlength