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Dear FreeSurfer experts,
After running the longitudinal pipeline with QDEC, I needed beta-values of the
associations between my main continuous variable and the significant cortical
cluster, as well as of all the nuisance factors/categorical variables. Since
the summary file doesn't list beta values, I attempted running this command to
find beta coefficients:
mri_segstats --i beta.mgh --annot fsaverage lh
lh-Avg-long.thickness-spc-Parietal_WMH-Cor/mc-z.abs.th20.sig.ocn.annot
--excludeid 0 --avgwf avgwf.dat
>From this, I got this output file listing beta values for 1 cluster
>(entorhinal cortex) that was related to my main continuous IV (parietal WMH).
>I'm struggling to understand how to still compute 1 beta-coefficient per
>variable from this list. I understand that this list, based on my fsgd file,
>can be split into 4 sets of numbers, but I'm not sure what do next.
avgwf.dat:
0.93879
-8.80748
0.38452
3.13252
-0.09493
-0.13107
-0.09960
-0.31087
-0.02291
0.03127
-0.02417
-0.07858
0.13087
1.80749
0.32535
0.64947
Below is how my fsgd file was structured:
GroupDescriptorFile 1
Title ParietalWMH_age_gender_APOe_EC_left
MeasurementName long.thickness-spc
Class APOE_statusNO-genderF
Class APOE_statusYES-genderF
Class APOE_statusNO-genderM
Class APOE_statusYES-genderM
Variables Parietal_WMH age_years Avg_ECthickness
Input W38284_base APOE_statusNO-genderF 0.732010 85.830000 3.125000
.. (only listing the 1st Input line here)
My contrast file (C.dat) looks like below:
0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0
So basically, I would like to get beta coefficients for the below variables:
* Parietal WMH
* Age
* Gender
* APOE status
* Average EC thickness (baseline values)
Thank you so much in advance for your help!
Batool
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