AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

History of AFNI updates  

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February 06, 2008 04:37PM
Vinny,

You have to be very careful when interpreting those path coefficients. First of all, they are not correlation coefficients. Suppose we have a network with a path connecting from region A to region B. The meaning of the path coefficient theta (e.g., 0.81) is this: if region A increases by one standard deviation from its mean, region B would be expected to increase by 0.81 its own standard deviations from its own mean while holding all other relevant regional connections constant. With a path coefficient of -0.16, when region A increases by one standard deviation from its mean, region B would be expected to decrease by 0.16 its own standard deviations from its own mean while holding all other relevant regional connections constant.

So theoretically speaking the range of the path coefficients can be anything, but most of the time they are from -1 to 1. To save running time, the default values for -limits are set with -1 and 1, but if the result hits the boundary, increase them and re-run the analysis.

Gang
Subject Author Posted

setting -limits value in 1dSEM

Vincent Costa February 06, 2008 04:24PM

Re: setting -limits value in 1dSEM

Gang Chen February 06, 2008 04:37PM

Re: setting -limits value in 1dSEM

Vincent Costa February 06, 2008 05:06PM