Hi,

do you happen to use Freesurfer version 5.3 or maybe earlier?

It seems to me that in the 5.3 version empty lines in the qdec-long
file (sub_long.dat in your case) were not skipped by the mris_preproc
script, hence the 'nsubjects = 80' message although there are only 79
"subjects" (time-points, to be precise) in your sub_long.dat file.

This does not occur anymore in the 6.0 version.

I suppose the problem can be solved by removing the trailing empty line
in your sub_long.dat file.

Please let us know if you are using a newer version than 5.3, since
then we need to look for something else.

Best regards,

Kersten

-----Original Message-----
From: lanbo Wang <drrambow@gmail.com>
Reply-to: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>
To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>
Subject: [Freesurfer] Linear Mixed Effect Modle
Date: Sat, 20 Jan 2018 21:00:44 +0100

Hi, all experts.

When I try to use LME model. There is a code "mris_preproc --qdec-long
qdec.table.dat --target fsaverage --hemi lh --meas thickness --out
lh.thickness.mgh" in LME tutorials website under "b)Mass-univariate".
When I ran it, error happened:
"""
[mtobia@localhost PD]$ mris_preproc --qdec-long
$SUBJECTS_DIR/sub_long.dat --target fsaverage --hemi lh --meas
thickness --out lh.thickness.long.mgh
nsubjects = 80
ERROR: cannot find /HD4/PD/Patients_Symptom//.long.
"""
And I already check the file name, The folder name match
<fsid>.long.<fsid_base>.
What should I do now?
Thanks for your help.

Best,
Lanbo

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