Gang Wrote:
-------------------------------------------------------
> > I get the following error message:
>
> The test index should be added:
>
> -num_glt 1 \
> -gltLabel 1 LinearTrend -gltCode 1 'condition: '
> \
>
Gang, I included those lines and still get the same error message:
Error in `[.data.frame`(dataStr, , vars[ii]) : undefined columns selected
Calls: process.LME.opts ... gl_Constr -> glfConstr -> levels -> [ -> [.data.frame
Execution halted
> > how does setting up the 1 0 -1 in 3dLME differ
> from the approach of
> > using the -gltcode contrast method? Where, 1 0
> -1, is essentially a
> > pairwise comparison between the 1st and 3rd
> level?
>
> In the LME model, the linear trend is tested for
> the *quantitative* variable as a whole in which
> the middle condition is set as an intercept. In
> contrast, the contrast test through 3dMVM only
> focuses on the first and last condition with the
> middle condition ignored. You may try both and
> check out the difference between the two
> approaches.
I see. Thanks.
