History of AFNI updates  

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November 09, 2022 11:16AM
Hi, Dante-

Ooook, I think this can happen when the time series is not already demeaned before entering it into 3dNetCorr. If a residual time series is entered, which should have a mean of zero, then this large change would not happen. If you have a time series with a mean far away from zero, and then apply a weight that is zero in some places, that will look like a giant spike in the time series, which will drive high correlation. Thanks for pointing that out.

I could probably add another option, say "-weight_corr ..." to perform weighting of the Pearson correlation coefficient, such as described here:
[en.wikipedia.org]
That might be more in line with your use case?

--pt
Subject Author Posted

3dNetCorr -weight_ts

dante.picchioni October 06, 2022 10:05AM

Re: 3dNetCorr -weight_ts

dante.picchioni October 12, 2022 10:55AM

Re: 3dNetCorr -weight_ts

ptaylor October 13, 2022 10:20AM

Re: 3dNetCorr -weight_ts

dante.picchioni November 05, 2022 11:47AM

Re: 3dNetCorr -weight_ts

ptaylor November 07, 2022 04:30PM

Re: 3dNetCorr -weight_ts

dante.picchioni November 09, 2022 10:01AM

Re: 3dNetCorr -weight_ts

ptaylor November 09, 2022 11:16AM

Re: 3dNetCorr -weight_ts

dante.picchioni November 09, 2022 01:39PM

Re: 3dNetCorr -weight_ts

ptaylor November 09, 2022 01:54PM

Re: 3dNetCorr -weight_ts

ptaylor November 10, 2022 07:48AM

Re: 3dNetCorr -weight_ts

dante.picchioni November 19, 2022 01:06PM

Re: 3dNetCorr -weight_ts

ptaylor November 20, 2022 11:20AM

Re: 3dNetCorr -weight_ts

dante.picchioni November 21, 2022 11:42AM

Re: 3dNetCorr -weight_ts

ptaylor November 21, 2022 06:32PM

Re: 3dNetCorr -weight_ts

ptaylor November 23, 2022 10:53AM

Re: 3dNetCorr -weight_ts

dante.picchioni November 26, 2022 08:38AM