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help > RE: Exclude nodes from the matrix for analysis
Dec 5, 2018 05:12 AM | Andrew Zalesky
RE: Exclude nodes from the matrix for analysis
Hi Marieke,
To exclude connections from testing a priori, you should replace the connection with the value of zero in the connectivity matrices of all subjects.
In other words, if a connection has weight of zero for all subjects, it will be excluded automatically.
Remember that when using FDR, a large number of permutations must be generated (100 000+). Using only 5000 permutations is NOT valid for FDR.
Andrew
Originally posted by Marieke van der Schaaf:
To exclude connections from testing a priori, you should replace the connection with the value of zero in the connectivity matrices of all subjects.
In other words, if a connection has weight of zero for all subjects, it will be excluded automatically.
Remember that when using FDR, a large number of permutations must be generated (100 000+). Using only 5000 permutations is NOT valid for FDR.
Andrew
Originally posted by Marieke van der Schaaf:
Dear NBS team,
Thank you very much for developing this toolbox!
For my analysis I want to analyse only a subset of the edges within my matrix as testing the full matrix includes many connections that I am not interested in, which unnecessarily increases my number of comparisons.
I tried doing this by replacing all connections that I am not interested in with NaNs in the data mat-file, but the results do not seem to differ from the analysis with the full matrix. I used FDR and generally T-values > 4.2 are indicated as significant in both analyses.
Is this the right way to do this or is there a better way to exclude connection from the analysis?
Thank you very much!
Marieke
Thank you very much for developing this toolbox!
For my analysis I want to analyse only a subset of the edges within my matrix as testing the full matrix includes many connections that I am not interested in, which unnecessarily increases my number of comparisons.
I tried doing this by replacing all connections that I am not interested in with NaNs in the data mat-file, but the results do not seem to differ from the analysis with the full matrix. I used FDR and generally T-values > 4.2 are indicated as significant in both analyses.
Is this the right way to do this or is there a better way to exclude connection from the analysis?
Thank you very much!
Marieke
Threaded View
| Title | Author | Date |
|---|---|---|
| Marieke van der Schaaf | Dec 4, 2018 | |
| Andrew Zalesky | Dec 5, 2018 | |
| Marieke van der Schaaf | Dec 6, 2018 | |
| Andrew Zalesky | Dec 8, 2018 | |