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help > RE: BOLD variance became zero after denoising
Nov 21, 2021 04:11 PM | Alfonso Nieto-Castanon - Boston University
RE: BOLD variance became zero after denoising
Dear Meishan,
Yes, exactly, if the reported degrees of freedom after denoising are zero or close to zero that means that all or most of the signal has been removed so there is no sufficient residual variance to meaningfully compute connectivity measures. If that occurs only for a few subjects or sessions one possibility would be simply removing those subjects/sessions from your analyses.
Best
Alfonso
Originally posted by Meishan Ai:
Yes, exactly, if the reported degrees of freedom after denoising are zero or close to zero that means that all or most of the signal has been removed so there is no sufficient residual variance to meaningfully compute connectivity measures. If that occurs only for a few subjects or sessions one possibility would be simply removing those subjects/sessions from your analyses.
Best
Alfonso
Originally posted by Meishan Ai:
Dear CONN users,
In the denoising tab, I found that a couple of participants' data will become % zero variance after denoising. I attached a screenshot on this post. Is this possible if the participant had a lot of movement (the invalid scan has a n=200+) so all the signal has been removed? Or is there something wrong with the dataset itself?
Thank you!
Meishan
In the denoising tab, I found that a couple of participants' data will become % zero variance after denoising. I attached a screenshot on this post. Is this possible if the participant had a lot of movement (the invalid scan has a n=200+) so all the signal has been removed? Or is there something wrong with the dataset itself?
Thank you!
Meishan
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| Title | Author | Date |
|---|---|---|
| Meishan Ai | Nov 20, 2021 | |
| Alfonso Nieto-Castanon | Nov 21, 2021 | |
| Meishan AI | Nov 22, 2021 | |