Hi! I’m running regressions with a task - baseline contrast and scores from a behavioral assessment, When I plot the beta values from the significant clusters from the regression against the behavioral scores, the results are in opposite direction from what the analysis returns. For example, I find a positive cluster and the plotted betas agains the scores is negative.
I used 3dttest++ regression for the analysis. Then 3dBucket to extract the statistical data from the specific contrasts for each subject, 3dmaskave with the cluster-mask that I saved from the regression analysis. everything appears to run normally and without error. Then, the resulting individual average beta values from 3dmaskave plotted with the behavioral scores don’t match the polarity of the clusters from the regression. Do you have any guidance?
the resulting individual average beta values from 3dmaskave plotted with the behavioral scores don’t match the polarity of the clusters from the regression.
In what sense they don’t match? Could you show (1) the scatter plot of contrast vs behavioral score at one ROI, and (2) the regression coefficient from 3dttest++ at that ROI?