help
help > RE: Second level results?
Feb 23, 2012 06:02 AM | Alfonso Nieto-Castanon - Boston University
RE: Second level results?
Hi Sheeba,
Yes, exactly, the FDR-corrected method depends on the distribution of T-statistics on each volume so different analyses will use different T- and k- thresholds in order to implement the same FDR-p threshold. (as a side note, it is not recommended to 'compare' the results from different groups by visually or otherwise comparing the individual within-group effects, rather it is preferred to perform this sort of 'comparisons' by defining the corresponding between-group second-level model -e.g. select both groups and enter a [1,-1] between-subjects contrast in order to compare the effects between the two groups)
Best
Alfonso
Originally posted by Sheeba Arnold:
Yes, exactly, the FDR-corrected method depends on the distribution of T-statistics on each volume so different analyses will use different T- and k- thresholds in order to implement the same FDR-p threshold. (as a side note, it is not recommended to 'compare' the results from different groups by visually or otherwise comparing the individual within-group effects, rather it is preferred to perform this sort of 'comparisons' by defining the corresponding between-group second-level model -e.g. select both groups and enter a [1,-1] between-subjects contrast in order to compare the effects between the two groups)
Best
Alfonso
Originally posted by Sheeba Arnold:
Hi Alfonso,
When I look at within group effects separately on the two groups I am interested in comparing and set a height threshold of p<0.05 FDR-corrected; I get different k values for the corresponding extent-thresholds for FDR-corrected p-values<.05 in each group.Is it driven by the corresponding T-cut off?
Thanks!
Sheeba
When I look at within group effects separately on the two groups I am interested in comparing and set a height threshold of p<0.05 FDR-corrected; I get different k values for the corresponding extent-thresholds for FDR-corrected p-values<.05 in each group.Is it driven by the corresponding T-cut off?
Thanks!
Sheeba
Threaded View
| Title | Author | Date |
|---|---|---|
| Johnson H | Oct 18, 2011 | |
| Alfonso Nieto-Castanon | Oct 18, 2011 | |
| Kaitlin Cassady | Feb 25, 2015 | |
| Kaitlin Cassady | Apr 8, 2015 | |
| Alfonso Nieto-Castanon | Apr 9, 2015 | |
| Sheeba Arnold | Feb 21, 2012 | |
| Alfonso Nieto-Castanon | Feb 23, 2012 | |
| Johnson H | Oct 19, 2011 | |
| Mary Newsome | Dec 14, 2011 | |