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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