[Homer-users] Group Means Output

[Perdue, Katherine]

Hi Amanda,

Ok, I see what the problem is. Your measurement list is not quite what I expected, because you list all of the SD pairs for wavelength 1 first, and then all of the SD pairs for the second wavelength. I think the order you put the measurement list in will depend on the NIRS instrument you are using- the kinds I am familiar with alternate wavelengths. The way you put it makes sense though, so I will update the code so it will not get confused by that.  For now, it should be fine to just interpret the values in order. I'll try to get a real fix out by the end of the week.

-Katherine



-------------
Katherine Perdue, PhD
Research Fellow in Pediatrics
Labs of Cognitive Neuroscience
Division of Developmental Medicine
Boston Children's Hospital

On Mar 13, 2013, at 4:36 PM, Amanda Kelly <adkelly at uvic.ca<mailto:adkelly at uvic.ca>>
 wrote:

Yes, I have the developer's version and I'm pretty sure it's fully
up-to-date. I just saw that Eugenio Parise asked the same question in the
Feb. 2013 archive and the solution was to update her program to the most
recent version. I have just re-run CVS Update and exported the group
results again, but still have the same labelling issue.

My measurement list matrix looks good and matches the probe array we used,
it is attached.

The output labels are given as (HbO,1,2), (HbR,1,2), (HbT,1,2), (HbO,2,3),
(HbR,2,3) ... and so on. Each of the five channels has three columns for
the three Hb concentrations, and then that list repeats (though the
concentration values are different).

Would it be possible to simply interpret the values as though my 10
channels were listed in order, ignoring the 1,2, 2,3, 3,5, etc. labels in
the output?

Thank you for your reply Katherine!

--Amanda


Hi Amanda,
Are you using the developer's version of Homer? What is your measurement
list matrix in the .nirs files? And are you saying the output labels look
like
(HbO,1,2), (HbO,1,2), (HbO,2,3), (HbO,2,3), etc
or something else?
-Katherine
-------------
Katherine Perdue, PhD
Research Fellow in Pediatrics
Labs of Cognitive Neuroscience
Division of Developmental Medicine
Boston Children's Hospital
On Mar 12, 2013, at 7:15 PM, Amanda Kelly
<adkelly at uvic.ca<mailto:adkelly at uvic.ca><mailto:adkelly at uvic.ca>>
wrote:
Hi everyone,
Has anybody exported group means from Homer into a text/Excel file? I
have
a quick question about the format of that data.
I understand how the file is set up, but am not sure how labels are
assigned to the channels (i.e., source-detector pairs).
In my output, the following 5 channels are listed: 1,2; 2,3; 3,5; 3,8;
4,7. Then this set is repeated again, giving a total of 10 channels. I
assume that the first number is for a detector and the second for a
source, since our probe array has 4 detectors and 8 sources.
In total, our probe array has 10 channels like so. (A and B are on the
left side of the head, C and D on the right.)
Detector A (1): sources 1, 2
Detector B (2): sources 2, 3, 4
Detector C (3): sources 5, 6, 8
Detector D (4): sources 6, 7
Therefore, it would make sense to me that the channels would be listed
as:
1,1; 1,2; 2,2; 2,3; 2,4; 3,5; 3,6; 3,8; 4,6; 4,7.
Any ideas as to why my channels appear the way they do in the group
means
output? Particularly why the same 5 are given twice. In the mean
response
section of the file, the concentration values under identically-labelled
cells (e.g. HbO,1,2) are not the same.
Any/all thoughts appreciated!
Thank you,
Amanda<probe array.png>_______________________________________________
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