RE: ROI.mat - Difference between "y" average and "h:

[color=#000000] Hi Tiago,[/color]

[color=#000000]The "results.h" values in those ROI.mat files represent the contrast values (between-subjects contrast linear combination of regression coefficients from GLM analysis of the data) while the "results.y" values represent the original/input data to the same GLM (e.g. Fisher-transformed correlation coefficients for each subject). Only in cases where your second-level analyses implement a one-sample t-test (e.g. selecting only the 'AllSubjects' effect), the results.h values will be equal to the average of the results.y values across subjects.[/color]

Hope this clarifies
Alfonso
[i]Originally posted by Tiago Guardia:[/i][quote]Hi all,

As far as I understand, for the ROI.mat file, the y column has the correlation values between ROIs, and the h column has the average of the y values for the particular pair of ROIs. However if I average the y column for a particular pair of ROIs, I'm finding a different value than shown in the h column.

Does anybody know why is that happening?

Thanks[/quote]