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help > RE: Graph Theory correlation measures
Sep 17, 2015 05:09 PM | Alfonso Nieto-Castanon - Boston University
RE: Graph Theory correlation measures
Hi Anna,
Yes, often only positive correlations are used in graph theory analyses (or more exactly, the sign of the correlations is considered when forming the adjacency matrix based on suprathreshold correlations; this applies not only to cost thresholdig but also to the other thresholding methods as well). You may change this default behavior, if you wish, in CONN's graph theory results simply by switching the network-forming correlation threshold value (the one used to compute the network adjacency matrix for each subject) to 'two-sided' instead of 'one-sided', and that will disregard the sign of the correlations when thresholding them.
Hope this helps
Alfonso
Originally posted by Anna Zilverstand:
Yes, often only positive correlations are used in graph theory analyses (or more exactly, the sign of the correlations is considered when forming the adjacency matrix based on suprathreshold correlations; this applies not only to cost thresholdig but also to the other thresholding methods as well). You may change this default behavior, if you wish, in CONN's graph theory results simply by switching the network-forming correlation threshold value (the one used to compute the network adjacency matrix for each subject) to 'two-sided' instead of 'one-sided', and that will disregard the sign of the correlations when thresholding them.
Hope this helps
Alfonso
Originally posted by Anna Zilverstand:
Hi Alfonso,
if I understand this correctly, then negative correlations are ignored when using cost thresholding in graph theory analysis (or more general, when using any sort of thresholding)? so the graph is only computed based on positive correlations?
Thank you for the great support!!!
Anna
if I understand this correctly, then negative correlations are ignored when using cost thresholding in graph theory analysis (or more general, when using any sort of thresholding)? so the graph is only computed based on positive correlations?
Thank you for the great support!!!
Anna
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| Title | Author | Date |
|---|---|---|
| Aiden Arnold | Aug 1, 2012 | |
| Shukti Ramkiran | May 3, 2016 | |
| Alfonso Nieto-Castanon | Aug 2, 2012 | |
| Anna Zilverstand | Sep 17, 2015 | |
| Alfonso Nieto-Castanon | Sep 17, 2015 | |
| Anna Zilverstand | Sep 17, 2015 | |
| Alfonso Nieto-Castanon | Sep 17, 2015 | |
| Anna Zilverstand | Sep 21, 2015 | |
| Alfonso Nieto-Castanon | Sep 25, 2015 | |
| Anna Zilverstand | Sep 25, 2015 | |
| Alfonso Nieto-Castanon | Sep 25, 2015 | |
| Anna Zilverstand | Sep 28, 2015 | |
| Alfonso Nieto-Castanon | Sep 28, 2015 | |
| Anna Zilverstand | Sep 28, 2015 | |
| Alfonso Nieto-Castanon | Sep 29, 2015 | |
| Anna Zilverstand | Sep 29, 2015 | |
| Anna Zilverstand | Sep 25, 2015 | |
| Anna Zilverstand | Sep 21, 2015 | |
| Anna Zilverstand | Sep 17, 2015 | |
| Ben Crittenden | Aug 27, 2015 | |
| Alfonso Nieto-Castanon | Aug 28, 2015 | |
| Ben Crittenden | Sep 18, 2015 | |
| Ben Crittenden | Sep 1, 2015 | |
| Aiden Arnold | Aug 3, 2012 | |
| Alfonso Nieto-Castanon | Aug 13, 2012 | |