Dear Melodic users,
I used group-ICA with concat approach on 10 fMRI acquisition of 240 TR.
I would like to report percent of explained variance extracted by the
second data reduction stage.
I found two different types of information:
- The “eigenvalues_percent” file which contains 10 * 26 values (26 =
model order estimated by Laplace approximation). I suppose it refers to
the second reduction step applied on concatenated first reduced data
([10*26]*voxels). This file indicates a proportion of explained variance
equal to 0.2635 (corresponding to column 26).
- The log file that indicates 66.6968 % of explained variance…
With a single subject ICA, this two values match.
Could anyone explain what I missed? Is one value is % of explained
variance extracted by the first reduction step?
Best regards,
Mikael
PS : here the command line used to compute gICA :
melodic -i input_files -o output_dir --nomask --approach=concat --report
--tr=2.000 --Ostats
(data sets are already masked)
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