Sorry, we are not supporting qdec anymore. You will need to use the
command-line stream
On 3/23/2022 8:02 AM, David wrote:
External Email - Use Caution
Hello FreeSurfer Developers,
I have a problem. Can you help me
freesurfer version : 6.0.0
Load qdec when I run qdec.table.dat, the
External Email - Use Caution
Hello FreeSurfer Developers,
I have a problem. Can you help me
freesurfer version : 6.0.0
Load qdec when I run qdec.table.dat, the data is loaded correctly, but when I
design, I choose discrete and continuous factors for analysis
The error log is as
They are the same thing underneath.
On 10/18/18 11:12 AM, Azeez, Azeezat wrote:
External Email - Use Caution
Thank you for the response.
Which smoothing option would you recommend, there is one in mris_preproc, but
there is also mris_smooth.
Thanks You
On Wed, Oct 17, 2018 at 1:56 PM G
External Email - Use Caution
Thank you for the response.
Which smoothing option would you recommend, there is one in mris_preproc,
but there is also mris_smooth.
Thanks You
On Wed, Oct 17, 2018 at 1:56 PM Greve, Douglas N.,Ph.D. <
dgr...@mgh.harvard.edu> wrote:
> You cannot use Q
You cannot use QDEC for this. You must use the "command line" stream,
ie, create your FSGD file, run mris_preproc, smooth, run mri_glmfit,
then mri_glmfit-sim. See the tutorial on the wiki.
On 10/17/2018 01:30 PM, Azeez, Azeezat wrote:
>
> External Email - Use Caution
>
> Hello,
>
> I wo
External Email - Use Caution
Hello,
I would like to know how I can run statistical analysis in QDEC on a data
set where there are 3 fixed factors each with 2 contrast levels.
(DEVELOPMENT : old vs young, SEX: male vs female, DIAGNOSE: Control Vs
disease )
Any help would be much a
That looks like the terminal output for qdec. You cannot use qdec with
your design. If you have questions about the FSGD, I'll be happy to
answer them.
On 10/16/2018 11:00 AM, vittal korann wrote:
>
> External Email - Use Caution
>
> Hi Doug,
>
> Thank you for your response.
> I tried th
External Email - Use Caution
Hi Doug,
Thank you for your response.
I tried the link which you sent yesterday. But got stuck while creating
qdec.fsgd file.
Below i have pasted the terminal output after loading the data.
1 Left-Lateral-Ventricle continuous 0
2 Left-Inf-Lat-Vent
You cannot use QDEC. For this case you'll need to use the "command line"
stream. You'll need to start by creating an FSGD file
https://surfer.nmr.mgh.harvard.edu/fswiki/FsgdExamples
On 10/15/18 10:15 AM, vittal korann wrote:
External Email - Use Caution
Hi Doug,
Recently I started work
External Email - Use Caution
Hi Doug,
Recently I started working on freesurfer for volume based analysis. For
QDEC, I need to include more than 2 variables. For example if I include
patients who hail from different places like statutory town, census town
and rural. In present scen
Dear FreeSurfer experts,
I am trying to analyze some single time points of my longitudinal data in QDEC.
I have 3 groups and created a file for the discrete factor "group" with three
levels (1,2 and 3). I have done the same for gender (with 2 levels). The
analysis with gender works just fine bu
rom: freesurfer-boun...@nmr.mgh.harvard.edu
[mailto:freesurfer-boun...@nmr.mgh.harvard.edu] On Behalf Of O'Shea,Andrew
Sent: Friday, November 13, 2015 4:07 PM
To: Freesurfer support list
Subject: Re: [Freesurfer] qdec analysis with ICV
I believe your issue is you are trying to do a between gr
quot;Hirsch, Gabriella"
mailto:gabriella_hir...@meei.harvard.edu>>
Reply-To: Freesurfer support list
mailto:freesurfer@nmr.mgh.harvard.edu>>
Date: Friday, November 13, 2015 at 1:58 PM
To: Freesurfer support list
mailto:freesurfer@nmr.mgh.harvard.edu>>
Subject: Re: [Free
rom: freesurfer-boun...@nmr.mgh.harvard.edu
[mailto:freesurfer-boun...@nmr.mgh.harvard.edu] On Behalf Of O'Shea,Andrew
Sent: Friday, November 13, 2015 1:55 PM
To: freesurfer@nmr.mgh.harvard.edu; David Vazquez
Subject: Re: [Freesurfer] qdec analysis with ICV
Try mean centering your ICV values (I.e. Sub
mailto:freesurfer@nmr.mgh.harvard.edu>"
mailto:freesurfer@nmr.mgh.harvard.edu>>
Subject: Re: [Freesurfer] qdec analysis with ICV
Thanks for the suggestion David. I tried it but I still got the same error :/
Gabriella
From: David Vazquez [mailto:dvazq...@ucr.edu]
Sent: Friday, November 13, 201
Thanks for the suggestion David. I tried it but I still got the same error :/
Gabriella
From: David Vazquez [mailto:dvazq...@ucr.edu]
Sent: Friday, November 13, 2015 12:36 PM
To: Hirsch, Gabriella
Subject: Re: [Freesurfer] qdec analysis with ICV
Hi Gabriella.
I'm not an expert, but I&#
Hi Freesurfer Experts,
I am hoping someone can help me solve this error I'm experiencing while
conducting a simple qdec analysis. I have 4 subjects (3 vs 1) that I am trying
to analyze for volume differences using a demeaned ICV as a nuisance factor
(see attached fsgd file - note I changed the
Dear Freesurfer experts,
I would like to study the cortical thickness difference between two
groups (two different genotypes) and include age and years of
education as covariates. I processed my data with Freesurfer 5.3.0 und
I am now running analysis in Qdec.
I don't know how to set the design
Try setting the age to be a nuisance variable.
doug
On 4/8/14 7:06 PM, Walton, Matt wrote:
Hello Freesurfer experts.
I am trying to run a QDEC analysis on some MRI data I have. I want to
see if thickness is correlated with language scores I have for each
subject, while accounting for differ
Hello Freesurfer experts.
I am trying to run a QDEC analysis on some MRI data I have. I want to see if
thickness is correlated with language scores I have for each subject, while
accounting for differences in age, and gender.
I would like to select the gender as a fixed variable, and both the a
ery insignificant. Am I missing
> somthing?
> Jon
>
> - Original Message -
> From: "Douglas N Greve"
> To: "Jon Wieser"
> Cc: "freesurfer"
> Sent: Tuesday, December 17, 2013 10:46:36 AM
> Subject: Re: [Freesurfer] qdec analysis with
I would think that a p-value of 0.8013 is very insignificant. Am I missing
somthing?
Jon
- Original Message -
From: "Douglas N Greve"
To: "Jon Wieser"
Cc: "freesurfer"
Sent: Tuesday, December 17, 2013 10:46:36 AM
Subject: Re: [Freesurfer] qdec analysis w
3.247 90900134.66-37.1 -33.2 -24.5 0.80130 0.79620
> 0.80640 267 fusiform
>
>
> - Original Message -
> From: "Douglas N Greve"
> To: "Jon Wieser"
> Cc: "freesurfer"
> Sent: Monday, December 16, 2013 4
-
From: "Douglas N Greve"
To: "Jon Wieser"
Cc: "freesurfer"
Sent: Monday, December 16, 2013 4:28:30 PM
Subject: Re: [Freesurfer] qdec analysis with 2 covariates
look at the CWP column
doug
On 12/16/2013 05:14 PM, Jon Wieser wrote:
> Hi Doug
>
> I ran
er-wise p-value?
>
> Jon
>
> - Original Message -
> From: "Douglas N Greve"
> To: "Jon Wieser" , Freesurfer@nmr.mgh.harvard.edu
> Sent: Friday, December 13, 2013 12:12:01 PM
> Subject: Re: [Freesurfer] qdec analysis with 2 covariates
>
>
r" , Freesurfer@nmr.mgh.harvard.edu
Sent: Friday, December 13, 2013 12:12:01 PM
Subject: Re: [Freesurfer] qdec analysis with 2 covariates
I would have thought that it would have gotten all of them. You can try
something like --cwp .9
On 12/13/2013 01:03 PM, Jon Wieser wrote:
> HI doug
n the GUI.
> perhaps theses are the most significant clusters?
> Jon
>
> - Original Message -
> From: "Douglas N Greve"
> To: "Jon Wieser"
> Cc: "freesurfer"
> Sent: Friday, December 13, 2013 11:43:29 AM
> Subject: Re: [Freesurfer] qdec
--glmdir MTA_ADHD_MJ --cwp .99 --sim
> ERROR: flag --sim requires four arguments
>
>
> what args do I give the --sim!
>
> Jon
>
>
>
> - Original Message -
> From: "Douglas N Greve"
> To: "Jon Wieser"
> Cc: "freesurfer&
From: "Douglas N Greve"
To: "Jon Wieser"
Cc: "freesurfer"
Sent: Friday, December 13, 2013 11:18:49 AM
Subject: Re: [Freesurfer] qdec analysis with 2 covariates
sorry, it is --cwp
On 12/13/2013 12:12 PM, Jon Wieser wrote:
> HI Doug
> MRI_glmfit-sim didn't rec
;
>
> - Original Message -
> From: "Douglas N Greve"
> To: "Jon Wieser"
> Cc: "freesurfer"
> Sent: Friday, December 13, 2013 10:54:19 AM
> Subject: Re: [Freesurfer] qdec analysis with 2 covariates
>
>
> I'm sure that those clu
t;
Sent: Friday, December 13, 2013 10:54:19 AM
Subject: Re: [Freesurfer] qdec analysis with 2 covariates
I'm sure that those clusters are not very significant. Try running
mri_glmfit-sim with --cwd .99 to capture all clusters
doug
On 12/12/2013 03:27 PM, Jon Wieser wrote:
> HI Doug,
&
: "Douglas N Greve"
> To: "Jon Wieser"
> Cc: "freesurfer"
> Sent: Thursday, December 12, 2013 1:15:58 PM
> Subject: Re: [Freesurfer] qdec analysis with 2 covariates
>
>
> I'm not sure what is going on. Can you send a screen shot of the qdec
> w
"
Sent: Thursday, December 12, 2013 1:22:35 PM
Subject: Re: [Freesurfer] qdec analysis with 2 covariates
It is showing you scatter plots from individual vertices, not an average
over the cluster
doug
On 12/12/2013 12:27 PM, Jon Wieser wrote:
> Is it possible to get the individual subjec
output the data values
> used to make the graph?
> Jon
>
> - Original Message -
> From: "Jon Wieser"
> To: "Douglas N Greve"
> Cc: "freesurfer"
> Sent: Tuesday, December 10, 2013 4:32:10 PM
> Subject: Re: [Freesurfer] qdec analysis
der as covariates
> Jon
>
> Jon
> - Original Message -
> From: "Douglas N Greve"
> To: "Jon Wieser" , Freesurfer@nmr.mgh.harvard.edu
> Sent: Tuesday, December 10, 2013 4:20:30 PM
> Subject: Re: [Freesurfer] qdec analysis with 2 covariates
&g
ot;
Sent: Tuesday, December 10, 2013 4:32:10 PM
Subject: Re: [Freesurfer] qdec analysis with 2 covariates
Hi Doug
I'm looking at the effect of MJ usage, the effect of whetherthe subject has
AHDH, and the interaction between MJ usage and ADHD
our threshold is 1.3
i have attahced our qdec.ta
From: "Douglas N Greve"
To: "Jon Wieser" , Freesurfer@nmr.mgh.harvard.edu
Sent: Tuesday, December 10, 2013 4:20:30 PM
Subject: Re: [Freesurfer] qdec analysis with 2 covariates
which contrast are you looking at in QDEC? Also, what is the voxel-wise
threshold in QDEC? The va
> From: "Douglas N Greve"
> To: "Jon Wieser"
> Cc: "freesurfer"
> Sent: Tuesday, December 10, 2013 4:03:06 PM
> Subject: Re: [Freesurfer] qdec analysis with 2 covariates
>
>
> So one of the contrasts has 40 clusters in the summary file
;Douglas N Greve"
> To: "Jon Wieser"
> Cc: "freesurfer"
> Sent: Tuesday, December 10, 2013 3:44:50 PM
> Subject: Re: [Freesurfer] qdec analysis with 2 covariates
>
>
> There should be a column for each cluster in contrast. Is that what you
> w
yes, that is what we want, but the files contain only 1-3 columns
Jon
- Original Message -
From: "Douglas N Greve"
To: "Jon Wieser"
Cc: "freesurfer"
Sent: Tuesday, December 10, 2013 3:44:50 PM
Subject: Re: [Freesurfer] qdec analysis with 2 covariates
each cluster, for every subject
>
> we have 120 subjects, with about 40 clusters
> Jon
>
> - Original Message -
> From: "Douglas N Greve"
> To: "Jon Wieser"
> Cc: "freesurfer"
> Sent: Tuesday, December 10, 2013 2:30:31 PM
> Subject:
To: "Jon Wieser"
Cc: "freesurfer"
Sent: Tuesday, December 10, 2013 2:30:31 PM
Subject: Re: [Freesurfer] qdec analysis with 2 covariates
OK, sorry, I thought qdec was running a script called mri_glmfit-sim but
it appears to be running the correction internally. That me
day, December 10, 2013 1:42:37 PM
> Subject: Re: [Freesurfer] qdec analysis with 2 covariates
>
>
> Is there a cache.mri_glmfit-sim.log in the output folder? Can you send
> it to me? Also, please remember to post to the list. thanks!
> doug
>
>
> On 12/10/2013 02:30 PM, Jon Wieser wro
i have a mri_glmfit.log,(attached) but no cache.mri_glmfit-sim.log in the
qdec output directory
Jon
- Original Message -
From: "Douglas N Greve"
To: "Jon Wieser" , Freesurfer@nmr.mgh.harvard.edu
Sent: Tuesday, December 10, 2013 1:42:37 PM
Subject: Re: [Freesurfer
"Jon Wieser" , Freesurfer@nmr.mgh.harvard.edu
> Sent: Tuesday, December 10, 2013 1:05:26 PM
> Subject: Re: [Freesurfer] qdec analysis with 2 covariates
>
>
> hmmm, it should be there. What version of FS are you using?
>
>
>
> On 12/10/2013 12:57 PM, Jon Wieser wrote
0.00 0.000100 0.000391 35.852306
> 0.00 0.715900
>95 1679.441040 0.00 0.000100 0.000353 36.207584
> 0.00 0.715900
>96 1694.963257 0.00 0.000100 0.000318 36.562862
> 0.00 0.715900
>97 1710.485474 0
> direct me to that data?
> Jon
> - Original Message -
> From: "Douglas N Greve"
> To: "Jon Wieser"
> Cc: "freesurfer"
> Sent: Monday, December 9, 2013 2:15:39 PM
> Subject: Re: [Freesurfer] qdec analysis with 2 covariates
>
>
eesurfer"
Sent: Monday, December 9, 2013 2:15:39 PM
Subject: Re: [Freesurfer] qdec analysis with 2 covariates
It is in one of the output files. Look for the .dat file in
mri_glmfit-sim --help
On 12/09/2013 03:01 PM, Jon Wieser wrote:
> thanks doug,
>
> We've run a 2x2 analy
> How can i get a table of thickness data , for feach subject in the analysis
> Jon
>
> - Original Message -
> From: "Douglas N Greve"
> To: freesurfer@nmr.mgh.harvard.edu
> Sent: Monday, December 9, 2013 1:48:15 PM
> Subject: Re: [Freesurfer] qdec analysis with
To: freesurfer@nmr.mgh.harvard.edu
Sent: Monday, December 9, 2013 1:48:15 PM
Subject: Re: [Freesurfer] qdec analysis with 2 covariates
Hi Jon, QDEC does not currently allow more than one covariates of
interest. You will have to use the command-line stream (ie,
mris_preproc, mri_surf2surf, mri_glm
Hi Jon, QDEC does not currently allow more than one covariates of
interest. You will have to use the command-line stream (ie,
mris_preproc, mri_surf2surf, mri_glmfit, mri_glmfit-sim)
doug
On 12/05/2013 02:57 PM, Jon Wieser wrote:
> HI freesurfer experts
>
> I want to do an analysis in qdec wi
HI freesurfer experts
I want to do an analysis in qdec with 2 groups(ADHD, and Marijuana usage) and
2 covariates(age and gender) to study the effect of these factors on cortical
thickness. I can only select a covariate in the qdec gui. is there a way to
select both covariates in the qdec GUI?
Oh, I meant to reply to an older post, but that didn't work
apparently. Below the original post.
This person does a group analysis, with gender and age as
covariates.You adviced to first do a DODS and look for a age-by-group
interaction. If there's no interaction, he/she could continue with
DOSS.
what post? Can you include it in the email so that I know what you are
referring to?
doug
On 9/23/13 7:06 AM, Anita van Loenhoud wrote:
> Hi, I have a question related to this post. Besides an age-group
> interaction, wouldn't it also be neccesary to check for an age-gender
> interaction?
>
Hi, I have a question related to this post. Besides an age-group
interaction, wouldn't it also be neccesary to check for an age-gender
interaction?
___
Freesurfer mailing list
Freesurfer@nmr.mgh.harvard.edu
https://mail.nmr.mgh.harvard.edu/mailman/listinf
Hello Doug, Hello Marie,
thank you very much for your answers,
I'm sorry I had missed your previous mail about QDEC!
I will use mri_glmfit then to confirm my results,
Best,
Elisa
2013/9/20 Douglas Greve
>
> Hi Marie,
>
> On 9/20/13 4:30 PM, Marie Schaer wrote:
> > Hi Doug,
> >
> > I'm jumpin
Hi Doug,
I'm jumping in the discussion because I was a bit scared with your previous
email mentioning that this DOSS bug affects all FreeSurfer's versions. Does
that also affect statistical analyses computed with mri_glmfit using the
command line? Do you have an insight whether the bias introd
Hi Marie,
On 9/20/13 4:30 PM, Marie Schaer wrote:
> Hi Doug,
>
> I'm jumping in the discussion because I was a bit scared with your previous
> email mentioning that this DOSS bug affects all FreeSurfer's versions. Does
> that also affect statistical analyses computed with mri_glmfit using the
Hi Elisa, don't use the DOSS feature in QDEC. Sorry, I sent out an email
about 6mo ago on this, but it is not easy to let people know about a bug
once the bug is out there.
doug
On 09/19/2013 11:30 AM, E. Scariati wrote:
> Dear Freesurfer experts,
>
> I would like to study the relationship bet
Dear Freesurfer experts,
I would like to study the relationship between cortical thickness and one
clinical variable with qdec, but correcting for age and gender.
Given that I have only one group and 2 covariates (one continuous, one
dichotomic) I don't know how I should set the design of my anal
Hello,
I'm new to Freesurfer and I was wondering whether anybody could tell me
what steps I need to do in Freesurfer in order to conduct the following
analysis?
I would like to know which sex differences in cortical thickness (subjects
12-18 years old) are present in the 12 year olds already. I'v
e -measure thickness
-fwhm 10; done
hope this helps
kk
- Original Message -
From: mdkrue...@uwalumni.com
To: "Kushal Kapse"
Cc: "freesurfer"
Sent: Wednesday, June 20, 2012 2:57:30 PM
Subject: Re: [Freesurfer] qdec analysis sequence
Kushal -
This helps immensely! Jus
com>
> To: "Douglas N Greve" <mailto:gr...@nmr.mgh.harvard.edu>>
> Cc: "freesurfer" <mailto:freesurfer@nmr.mgh.harvard.edu>>
> Sent: Wednesday, June 20, 2012 1:43:28 PM
> Subject: Re: [Freesurfer] qdec analysis sequence
>
krue...@uwalumni.com
> To: "Douglas N Greve"
> Cc: "freesurfer"
> Sent: Wednesday, June 20, 2012 1:43:28 PM
> Subject: Re: [Freesurfer] qdec analysis sequence
>
>
> Perfect that should make things a bit easier on me, also according to this
> post
>
hope this helps
kk
- Original Message -
From: mdkrue...@uwalumni.com
To: "Douglas N Greve"
Cc: "freesurfer"
Sent: Wednesday, June 20, 2012 1:43:28 PM
Subject: Re: [Freesurfer] qdec analysis sequence
Perfect that should make things a bit easier on me, also according to
nope, can't run multiple subjects
On 06/20/2012 01:43 PM, mdkrue...@uwalumni.com wrote:
> Perfect that should make things a bit easier on me, also according to
> this post
>
> http://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg12406.html
>
> it is not possible to run multiple subjects
Perfect that should make things a bit easier on me, also according to this
post
http://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg12406.html
it is not possible to run multiple subjects with this set up (recon-all -s
(subjectid) -qcache -fwhm 10, however this was from 2009, so not sure
Hi Jenny, Martin will be the best person to answer your question.
Unfortunately, he is in China now. I think he's back next week.
doug
On 06/20/2012 01:37 AM, Jenny Liu wrote:
> Hello,
>
> I am attempting to use the Qdec Analysis for longitudinal data.
> Specifically, each subject has two timepo
Hello,
I am attempting to use the Qdec Analysis for longitudinal data.
Specifically, each subject has two timepoints, and belongs to one of two
groups. Each subject has an accompanying age and painUnpleasantness rating.
I do not have a 'time in years' variable, and instead listed the timepoint
as
Thank you Prof. Greve. Hope all is well on your side.
On Thu, Jun 14, 2012 at 8:03 PM, Douglas N Greve
wrote:
> It is okay to study a single cohort with covariates.
> doug
>
> On 06/14/2012 11:54 AM, Dhinakaran Chinappen wrote:
> > Dear Freesurfer Experts,
> >
> > For one of our studies, I have u
It is okay to study a single cohort with covariates.
doug
On 06/14/2012 11:54 AM, Dhinakaran Chinappen wrote:
> Dear Freesurfer Experts,
>
> For one of our studies, I have used QDEC to analyze the relationship
> between cortical thickness and a series of variables.
>
> I wanted to double check to
Dear Freesurfer Experts,
For one of our studies, I have used QDEC to analyze the relationship
between cortical thickness and a series of variables.
I wanted to double check to see if it is okie to have a qdec table which
only includes the diseased population and the covariates (such as FSIQ).
Af
du"
> *Sent:* Thursday, January 26, 2012 9:34 AM
> *Subject:* Re: [Freesurfer] qdec analysis
>
> Does y.mgh exist? y.mgh is the stack of data that should be created by
> qdec. I think it's called y.mgh and I think that it is in the GLM dir,
> but it might be in the director
Does y.mgh exist? y.mgh is the stack of data that should be created by
qdec. I think it's called y.mgh and I think that it is in the GLM dir,
but it might be in the directory just above it.
doug
Cat Chong wrote:
> Hi Doug,
> I spoke too soon. I tried to follow your advice and run either command
Hi Doug,
I spoke too soon. I tried to follow your advice and run either command:
In a terminal, cd to the GLM directory inside qdec directory and then cd to the
folder of the contrast of interest and run
mri_segstats --id 1 --slabel fsaverage lh yourlabel --i gamma.mgh --sum
yourlabel.sum
t
Hi Cat,
first create and save a label of your cluster.
In a terminal, cd to the GLM directory inside qdec directory and then cd
to the folder of the contrast of interest and run
mri_segstats --id 1 --slabel fsaverage lh yourlabel --i gamma.mgh --sum
yourlabel.sum
the output yourlabel.sum will h
Hello Experts:
In qdec, I would like to analyze if the thickness- entorhinal volume
correlation differs between APOE positive and negative subjects accounting for
age.
I have chosen age as a nuisance variable and entorhinal volume as a covartiate.
( hope this is correct)
Results show me several
I'm using QDEC to analyze cortical thickness differences between groups and
I have a few questions:
1) There are a few variables that I need to control for. First variable is
scanner - I used two different scanners of different field strengths (1.5T
GE and 3T Siemens) so I wanted to control for sc
Yes it does. However you can maybe use the scanner as a covariate.
On Wed, Apr 27, 2011 at 09:24, John Fredy wrote:
> Hello all,
>
> In voxel based morphometry is not recommended use images from different
> scanners. This recommendation also apply in the qdec analysis?
>
> Thanks in advance
>
>
Hello all,
In voxel based morphometry is not recommended use images from different
scanners. This recommendation also apply in the qdec analysis?
Thanks in advance
John Ochoa
Universidad de Antioquia
Instituto Neurológico de Antioquia
___
Freesurfer ma
Yes, that looks fine. The only other thing to decide is whether to use
DODS (different offset different slope) or DOSS (different offset same
slope). The default is DODS, but if you don't think that there is an
age-by-group interaction, then you can get more power using DOSS. If you
use DODS,
Hi,
We are doing a group analysis using qdec with two groups, and we would like
to include gender and age as covariates.
Which is the best option in order to perform a simple t-test (group1>group2
and group2>group1) and including the two covariates? (we would like them to
have 'zero' weighting in
You have done the right thing, but you need to know a little more. When
QDEC says "mean thickness" it really means the thickness at age=0, so it
is extrapolating the results back to age=0. Since you have a covariate
and you are using DODS, you have to specify an age at which to do the
test (you
Dear Freesurfers,
in my qdec analysis I want to compare
my patients group with a control group. The analysis should be
corrected for age effects, so I used group as discrete factor and age
as covariate. If I choose „Does the average thickness differ
between the two groups“, how can I interpretat
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