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

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Emperor Zhark
August 28, 2014 10:58AM
The program doesn't "know" that you just masked the data with your 3dcalc expression. The author (me) assumed the worst, that you changed the values in some arbitrary way, so that they are no longer from well-known statistical distributions -- for example, if you took the cube root of a t-statistic, it would no longer be useful.

You can re-attach the codes that mark various sub-bricks as coming from known statistical distributions using the 3drefit program's "-substatpar" option, as in

3drefit -substatpar 2 fitt 49.0 dataset+orig.HEAD

which would tell the program to mark sub-brick #2 (recall that counting starts at #0) as a t-statistic with 49.0 degrees of freedom. See the output of 3drefit -help for more details: http://afni.nimh.nih.gov/pub/dist/doc/program_help/3drefit.html
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Subject Author Posted

Masking stats dataset destroys p-values

shanusmagnus August 28, 2014 02:47AM

Re: Masking stats dataset destroys p-values

Emperor Zhark August 28, 2014 10:58AM

Re: Masking stats dataset destroys p-values

shanusmagnus August 28, 2014 11:09AM