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help > Multiple covariates and scanner-correction
Nov 3, 2016 02:11 PM | Jiri van Bergen - UZH Zurich
Multiple covariates and scanner-correction
Dear CONN users,
I am a bit confused how to enter my between-subjects contrasts.
I have 2 linear measures (Iron and Amyloid) but not all subjects were acquired on the same MRI system (8 channel vs 32 channel coil) so I should correct for that. Therefore I created a covariate ScannerType with '1' or '2' depending on which system they were scanned on.
1) How do I investigate if there is an effect of Iron*Amyloid while correcting for ScannerType?
2) Some subjects are special (very high age), how would I do separate analyses for this group?
Do I need to create separate IronOld and AmyloidOld covariates?
I am a bit confused how to enter my between-subjects contrasts.
I have 2 linear measures (Iron and Amyloid) but not all subjects were acquired on the same MRI system (8 channel vs 32 channel coil) so I should correct for that. Therefore I created a covariate ScannerType with '1' or '2' depending on which system they were scanned on.
1) How do I investigate if there is an effect of Iron*Amyloid while correcting for ScannerType?
2) Some subjects are special (very high age), how would I do separate analyses for this group?
Do I need to create separate IronOld and AmyloidOld covariates?
Threaded View
| Title | Author | Date |
|---|---|---|
| Jiri van Bergen | Nov 3, 2016 | |
| Alfonso Nieto-Castanon | Nov 4, 2016 | |
| Dilip Kumar | Jun 25, 2021 | |
| Himanshu Joshi | Jan 12, 2017 | |
| Alfonso Nieto-Castanon | Jan 27, 2017 | |
| Himanshu Joshi | Jan 25, 2017 | |
| Jiri van Bergen | Nov 7, 2016 | |