Hi, sorry I must have missed your response last week. Yes, I'm doing an identical analysis: comparing 2 groups of kids (controls and ADHD) in cortical thickness, controlling for age and demeaned ICV (nuisance). So all the parameters are the same. I'm attaching 3 screen shots: group differences using 5.0 before using Monte Carlo correction (lots of clusters), group differences before correction using 5.3 (few small clusters), and group differences using 5.0 after correction (frontal cluster). there was nothing sig. remaining after correcting for multi. comparisons using 5.3. I'm puzzled about why the differences are so large. I selected DODS in 5.0, so everything should be the same?
Thanks! Maria
On Tue, Jun 25, 2013 at 12:02 PM, Maria Kharitonova < maria.kharitonova@colorado.edu> wrote:
Hi, sorry I must have missed your response last week. Yes, I'm doing an identical analysis: comparing 2 groups of kids (controls and ADHD) in cortical thickness, controlling for age and demeaned ICV (nuisance). So all the parameters are the same. I'm attaching 3 screen shots: group differences using 5.0 before using Monte Carlo correction (lots of clusters), group differences before correction using 5.3 (few small clusters), and group differences using 5.0 after correction (frontal cluster). there was nothing sig. remaining after correcting for multi. comparisons using 5.3. I'm puzzled about why the differences are so large. I selected DODS in 5.0, so everything should be the same?
Thanks! Maria
Message: 10 Date: Tue, 18 Jun 2013 23:34:10 -0700 From: Douglas Greve greve@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] qdec differences in FS 5.0 vs 5.3 To: freesurfer@nmr.mgh.harvard.edu Message-ID: 51C150E2.1080604@nmr.mgh.harvard.edu Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi Maria, can you elaborate on exactly what you have done? Is the data the same and you are only changing the version of QDEC? What is the nature of the difference? Can you send pics or stats? doug
On 6/18/13 6:06 AM, Maria Kharitonova wrote:
Hi,
I'm learning how to use QDEC and was comparing results that it produces
under FresSurfer 5.0 vs 5.3. I know the 5.0 has an option for either DODS or DOSS method of producing a design matrix, while the 5.3 only has DODS. This suggests that results should be identical (or at least similar) across versions if I select DODS. However, I'm getting very different results based on the version I select: complete lack of differences across groups in 5.3 and a predicted pattern of differences in 5.0 using DODS. I'd like to understand where the differences are stemming from -- any ideas?
Thanks in advance! Maria
Maria Kharitonova, Ph.D. Postdoctoral Research Fellow Laboratories of Cognitive Neuroscience Boston Children's Hospital
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