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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July 31, 2017 12:58PM
Hi Ali,

Jumping in for more fun...

1) Gang's suggestion of 3dDeconvolve or 3dfim+ can get you p-values,
or you could run cdf yourself. For example, if a time series of length 100
yields a correlation of 0.3, then the p-value might be 0.002426, from:

cdf -t2p fico .3 100 1 1

That assumes only demeaning the data (as is done with 3dTcorr1D).
If quadratic detrending were done, the ort-dof would be 3, leading to
a p-value of 0.00269, from:

cdf -t2p fico .3 100 1 3

See the output of "cdf -help" for details.

2) 3dTcorr1D removes the mean, but does no trend removal.

- rick
Subject Author Posted

correlation of time series with 3D+time

Ali_Ghazizadeh July 28, 2017 12:43PM

Re: correlation of time series with 3D+time

gang July 31, 2017 11:53AM

Re: correlation of time series with 3D+time

Daniel Glen July 31, 2017 12:21PM

Re: correlation of time series with 3D+time

rick reynolds July 31, 2017 12:58PM

Re: correlation of time series with 3D+time

Ali_Ghazizadeh August 01, 2017 09:25AM

Re: correlation of time series with 3D+time

Ali_Ghazizadeh August 02, 2017 08:52AM