help > RE: Problem with Contrast adjustment
Nov 4, 2021  01:11 AM | Donald McLaren
RE: Problem with Contrast adjustment
Hi Marcel,

Do you get the same error with the sample dataset? This would help determine if it is unique to the current dataset/model or the underlying code/software version.


Originally posted by Marcel Daamen:

I have problems with applying the default setting P.contrast={'Omnibus F-test for PPI analyses'}.

I want to analyze a simple emotional face matching paradigm with three task regressors (Instruction, Forms, Faces) and the classical six realignment parameters (which I want to control for). 

Analysis with P.contrast=0 runs flawlessly. Turning to the default setting, the following error message appears, no matter whether I create the effect of interest myself, or let gPPI build the contrast automatically:

Not enough input arguments.

Error in beta (line 19)
y = exp(betaln(z,w));
Error in timeseries_extract (line 370)
Error in PPPI (line 461)

Following the instructions from the manual, I do not see which input I miss to define.

Thanks in advance for your help,


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Marcel Daamen Nov 3, 2021
RE: Problem with Contrast adjustment
Donald McLaren Nov 4, 2021
Marcel Daamen Nov 4, 2021
Marcel Daamen Nov 9, 2021