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help > RE: gPPI conditions' effect sizes meaning?
Jul 5, 2022 10:07 AM | Alfonso Nieto-Castanon - Boston University
RE: gPPI conditions' effect sizes meaning?
Dear Panagiotis,
The effect-size plots y-scale displays the group-level GLM regressor coefficients for each individual condition and/or group, so the units of those measures depend on your specific analysis. For example, if your group-level analysis was a paired t-test of gPPI results (e.g. comparing two conditions in gPPI), then the units/scale of those effect-size plots will simply represent the gPPI interaction terms associated with each individual condition (e.g. 'repeats') and averaged across all subjects .
Hope this helps
Alfonso
ps. and just for reference the interaction terms in gPPI represent the relative connectivity between seed and target ROIs during each individual condition compared to the gPPI-model implicit baseline (so the measures are unit-less, as they represent percent BOLD signal change in the target ROI per unit change in BOLD signal in seed ROI), with positive values indicating increases in connectivity during one condition compared to baseline, and negative values indicating decreases in connectivity.
Originally posted by Panagiotis Iliopoulos:
The effect-size plots y-scale displays the group-level GLM regressor coefficients for each individual condition and/or group, so the units of those measures depend on your specific analysis. For example, if your group-level analysis was a paired t-test of gPPI results (e.g. comparing two conditions in gPPI), then the units/scale of those effect-size plots will simply represent the gPPI interaction terms associated with each individual condition (e.g. 'repeats') and averaged across all subjects .
Hope this helps
Alfonso
ps. and just for reference the interaction terms in gPPI represent the relative connectivity between seed and target ROIs during each individual condition compared to the gPPI-model implicit baseline (so the measures are unit-less, as they represent percent BOLD signal change in the target ROI per unit change in BOLD signal in seed ROI), with positive values indicating increases in connectivity during one condition compared to baseline, and negative values indicating decreases in connectivity.
Originally posted by Panagiotis Iliopoulos:
Dear Alfonso / CONN community,
I forward this question I made before:
What the effect sizes mean in the plot given from the results (see in my case ROI-to-ROI gPPI analysis).
The problem is that the Y axis has not a metric label, so it's unclear in which metric these effect sizes refer to?
***
-> please check the plot in my case (picture) to get it fast
(check the post above (May 12), it includes the picture)
Many thanks :)
I forward this question I made before:
What the effect sizes mean in the plot given from the results (see in my case ROI-to-ROI gPPI analysis).
The problem is that the Y axis has not a metric label, so it's unclear in which metric these effect sizes refer to?
***
-> please check the plot in my case (picture) to get it fast
(check the post above (May 12), it includes the picture)
Many thanks :)
Threaded View
| Title | Author | Date |
|---|---|---|
| Panagiotis Iliopoulos | May 12, 2022 | |
| Panagiotis Iliopoulos | Jul 3, 2022 | |
| Alfonso Nieto-Castanon | Jul 5, 2022 | |
| Panagiotis Iliopoulos | May 15, 2022 | |