[Homer-users] Group Means Output

[Perdue, Katherine]

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>>
 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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