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David Sturman
August 06, 2003 04:39PM
Hi,
I'm trying to run a 2 x 2 ANOVA using 3dANOVA3. I am trying to set up the ANOVA using the -type 4 option in which the first two factors are fixed factors and the last factor, which is the subjects, is the random factor. There are 13 subjects in this analysis.

I will paste the command I am using right here. I know it looks messy but it's highly repetitive (I will paste the error message below it).

3dANOVA3 -type 4 -alevels 2 -blevels 2 -clevels 13 \
-dset 1 1 1 /data27/luiz/switching2/anna/afni/AA_coef_switch_C+tlrc \
-dset 1 2 1 /data27/luiz/switching2/anna/afni/AA_coef_switch_P+tlrc \
-dset 2 1 1 /data27/luiz/switching2/anna/afni/AA_coef_nonswitch_C+tlrc \
-dset 2 2 1 /data27/luiz/switching2/anna/afni/AA_coef_nonswitch_P+tlrc \
-dset 1 1 2 /data27/luiz/switching2/charles/afni/CM_coef_switch_C+tlrc \
-dset 1 2 2 /data27/luiz/switching2/charles/afni/CM_coef_switch_P+tlrc \
-dset 2 1 2 /data27/luiz/switching2/charles/afni/CM_coef_nonswitch_C+tlrc \
-dset 2 2 2 /data27/luiz/switching2/charles/afni/CM_coef_nonswitch_P+tlrc \
-dset 1 1 3 /data27/luiz/switching2/jason/afni/JB_coef_switch_C+tlrc \
-dset 1 2 3 /data27/luiz/switching2/jason/afni/JB_coef_switch_P+tlrc \
-dset 2 1 3 /data27/luiz/switching2/jason/afni/JB_coef_nonswitch_C+tlrc \
-dset 2 2 3 /data27/luiz/switching2/jason/afni/JB_coef_nonswitch_P+tlrc \
-dset 1 1 4 /data27/luiz/switching2/jeff/afni/JR_coef_switch_C+tlrc \
-dset 1 2 4 /data27/luiz/switching2/jeff/afni/JR_coef_switch_P+tlrc \
-dset 2 1 4 /data27/luiz/switching2/jeff/afni/JR_coef_nonswitch_C+tlrc \
-dset 2 2 4 /data27/luiz/switching2/jeff/afni/JR_coef_nonswitch_P+tlrc \
-dset 1 1 5 /data27/luiz/switching2/laura/afni/LR_coef_switch_C+tlrc \
-dset 1 2 5 /data27/luiz/switching2/laura/afni/LR_coef_switch_P+tlrc \
-dset 2 1 5 /data27/luiz/switching2/laura/afni/LR_coef_nonswitch_C+tlrc \
-dset 2 2 5 /data27/luiz/switching2/laura/afni/LR_coef_nonswitch_P+tlrc \
-dset 1 1 6 /data27/luiz/switching2/luisa/afni/LM_coef_switch_C+tlrc \
-dset 1 2 6 /data27/luiz/switching2/luisa/afni/LM_coef_switch_P+tlrc \
-dset 2 1 6 /data27/luiz/switching2/luisa/afni/LM_coef_nonswitch_C+tlrc \
-dset 2 2 6 /data27/luiz/switching2/luisa/afni/LM_coef_nonswitch_P+tlrc \
-dset 1 1 7 /data27/luiz/switching2/matthew/afni/MD_coef_switch_C+tlrc \
-dset 1 2 7 /data27/luiz/switching2/matthew/afni/MD_coef_switch_P+tlrc \
-dset 2 1 7 /data27/luiz/switching2/matthew/afni/MD_coef_nonswitch_C+tlrc \
-dset 2 2 7 /data27/luiz/switching2/matthew/afni/MD_coef_nonswitch_P+tlrc \
-dset 1 1 8 /data27/luiz/switching2/michael/afni/MT_coef_switch_C+tlrc \
-dset 1 2 8 /data27/luiz/switching2/michael/afni/MT_coef_switch_P+tlrc \
-dset 2 1 8 /data27/luiz/switching2/michael/afni/MT_coef_nonswitch_C+tlrc \
-dset 2 2 8 /data27/luiz/switching2/michael/afni/MT_coef_nonswitch_P+tlrc \
-dset 1 1 9 /data27/luiz/switching2/peter/afni/PC_coef_switch_C+tlrc \
-dset 1 2 9 /data27/luiz/switching2/peter/afni/PC_coef_switch_P+tlrc \
-dset 2 1 9 /data27/luiz/switching2/peter/afni/PC_coef_nonswitch_C+tlrc \
-dset 2 2 9 /data27/luiz/switching2/peter/afni/PC_coef_nonswitch_P+tlrc \
-dset 1 1 10 /data27/luiz/switching2/roshanak/afni/RS_coef_switch_C+tlrc \
-dset 1 2 10 /data27/luiz/switching2/roshanak/afni/RS_coef_switch_P+tlrc \
-dset 2 1 10 /data27/luiz/switching2/roshanak/afni/RS_coef_nonswitch_C+tlrc \
-dset 2 2 10 /data27/luiz/switching2/roshanak/afni/RS_coef_nonswitch_P+tlrc \
-dset 1 1 11 /data27/luiz/switching2/stacy/afni/SW_coef_switch_C+tlrc \
-dset 1 2 11 /data27/luiz/switching2/stacy/afni/SW_coef_switch_P+tlrc \
-dset 2 1 11 /data27/luiz/switching2/stacy/afni/SW_coef_nonswitch_C+tlrc \
-dset 2 2 11 /data27/luiz/switching2/stacy/afni/SW_coef_nonswitch_P+tlrc \
-dset 1 1 12 /data27/luiz/switching2/su/afni/SK_coef_switch_C+tlrc \
-dset 1 2 12 /data27/luiz/switching2/su/afni/SK_coef_switch_P+tlrc \
-dset 2 1 12 /data27/luiz/switching2/su/afni/SK_coef_nonswitch_C+tlrc \
-dset 2 2 12 /data27/luiz/switching2/su/afni/SK_coef_nonswitch_P+tlrc \
-dset 1 1 13 /data27/luiz/switching2/yugal/afni/YS_coef_switch_C+tlrc \
-dset 1 2 13 /data27/luiz/switching2/yugal/afni/YS_coef_switch_P+tlrc \
-dset 2 1 13 /data27/luiz/switching2/yugal/afni/YS_coef_nonswitch_C+tlrc \
-dset 2 2 13 /data27/luiz/switching2/yugal/afni/YS_coef_nonswitch_P+tlrc -fab RE_interaction

the error is this:

3dANOVA3 Error: must have equal sample sizes for 3dANOVA3.

My impression is that the error means that each subject does not have each factor associated with it. I have checked this several times and I think they're all there.

So I tried to run the 3dANOVA3 using just the first 4 subjects. And it worked. Then I tried adding another 4 to the command and it complained. I found out that it would work as long as I used 6 subjects or less. It didn't matter which subjects I used. As long as I used 6 or fewer subjects it was fine.

Does anyone have any suggestions of what's going wrong here?

Thank you very much.

David Sturman
LBC

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Subject Author Posted

Using 3dANOVA3 to run a 2x2 repeated measures ANOVA

David Sturman August 06, 2003 04:39PM

Re: Using 3dANOVA3 to run a 2x2 repeated measures ANOVA

B. Douglas Ward August 06, 2003 06:24PM