help > Sliding Window correlation matrices
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Nov 12, 2019 06:11 PM | ghall - McMaster University
Sliding Window correlation matrices
Dear Alfonso,
I'm trying to obtain ROI-to-ROI correlation matrices for each epoch of a sliding window analysis. I've chosen temporal decomposition (sliding-window) under the time-frequency decomposition heading of SETUP > Conditions. The analysis seems to have generated the roi-to-roi correlation values for each timing window, but I'm wondering how to access the values as a matrix. Is there an existing .mat file with the values?
Thanks much,
Geoff
I'm trying to obtain ROI-to-ROI correlation matrices for each epoch of a sliding window analysis. I've chosen temporal decomposition (sliding-window) under the time-frequency decomposition heading of SETUP > Conditions. The analysis seems to have generated the roi-to-roi correlation values for each timing window, but I'm wondering how to access the values as a matrix. Is there an existing .mat file with the values?
Thanks much,
Geoff
Nov 18, 2019 04:11 PM | ghall - McMaster University
RE: Sliding Window correlation matrices
I can see that there are files with names like resultsROI_Subject001_Condition001.mat, that contain matrices that look promising. In particular, the
variable called Z presumably refers to Z-scores from the ROI to ROI
correlations. Is that the case? Further, is there a way to
get the actual correlation values from conn?
Dec 6, 2019 05:12 PM | ghall - McMaster University
RE: Sliding Window correlation matrices
Hi Alfonzo - any info on this posting???
thanks
G
I can see that there are files with names like resultsROI_Subject001_Condition001.mat, that contain matrices that look promising. In particular, the variable called Z presumably refers to Z-scores from the ROI to ROI correlations. Is that the case? Further, is there a way to get the actual correlation values from conn?
thanks
G
I can see that there are files with names like resultsROI_Subject001_Condition001.mat, that contain matrices that look promising. In particular, the variable called Z presumably refers to Z-scores from the ROI to ROI correlations. Is that the case? Further, is there a way to get the actual correlation values from conn?
Dec 8, 2019 05:12 PM | Alfonso Nieto-Castanon - Boston University
RE: Sliding Window correlation matrices
Hi Geoff,
Yes, exactly, the Z matrices in those files (resultsROI_Subject*_Condition*.mat) contain the ROI-to-ROI Fisher transformed correlations for each subject and condition (you can check in the file named _list_conditions.txt in that same folder to see the association between condition numbers in these filenames and condition names in your CONN project). If you prefer to load the data from all subjects together you may use the file named "resultsROI_Condition*.mat" instead. Last, if you prefer to have raw correlation coefficients simply compute "R = tanh(Z);"
Hope this helps
Alfonso
Originally posted by ghall:
Yes, exactly, the Z matrices in those files (resultsROI_Subject*_Condition*.mat) contain the ROI-to-ROI Fisher transformed correlations for each subject and condition (you can check in the file named _list_conditions.txt in that same folder to see the association between condition numbers in these filenames and condition names in your CONN project). If you prefer to load the data from all subjects together you may use the file named "resultsROI_Condition*.mat" instead. Last, if you prefer to have raw correlation coefficients simply compute "R = tanh(Z);"
Hope this helps
Alfonso
Originally posted by ghall:
I can see that there are files with names
like resultsROI_Subject001_Condition001.mat, that
contain matrices that look promising. In particular, the variable
called Z presumably refers to Z-scores from the ROI to ROI
correlations. Is that the case? Further, is there a way to
get the actual correlation values from conn?