Dear surfers,
I computed F-contrast using selxavg3-sess with an identity matrix as a contrast matrix. My question is about the result file “sig.*”. As far as I understand, the “sig.*” file contains signed-minnus-log-p-values (like, -log10(p)*Sign(t)) for a certain contrast.
So I expected the dimension should be #vertices-by-1, but the sig.* file is in the dimension of #vertices-by-1-by-1-by-#regressors. I would appreciate post-hoc tests after F-test, but the dimension doesn’t look like one… or is it? like i-th regressor v.s. (N-i) regressors? If one can tell where I can find p-values for the F-test, and what are the values in the sig.* file.
+ wait. is "fsig.*” for the F-test? and “sig.*” for a set of one-vs.-the-others contrasts? I would still appreciate if one can confirm it.
Best regards,
yes, fsig is the F test. The sig has the result of all the individual t-tests
On 02/06/2017 08:41 AM, Seung-Goo KIM wrote:
Dear surfers,
I computed F-contrast using selxavg3-sess with an identity matrix as a contrast matrix. My question is about the result file “sig.*”. As far as I understand, the “sig.*” file contains signed-minnus-log-p-values (like, -log10(p)*Sign(t)) for a certain contrast.
So I expected the dimension should be #vertices-by-1, but the sig.* file is in the dimension of #vertices-by-1-by-1-by-#regressors. I would appreciate post-hoc tests after F-test, but the dimension doesn’t look like one… or is it? like i-th regressor v.s. (N-i) regressors? If one can tell where I can find p-values for the F-test, and what are the values in the sig.* file.
- wait. is "fsig.*” for the F-test? and “sig.*” for a set of
one-vs.-the-others contrasts? I would still appreciate if one can confirm it.
Best regards,
Seung-Goo KIM
Research Group for Cortical Networks and Cognitive Functions, Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstraße 1A, 04103 Leipzig, Germany. Phone: +49 341 9940 2618 | Fax: +49 341 9940 2624 http://www.cbs.mpg.de/~skim http://www.cbs.mpg.de/%7Eskim
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
Thank you very much, Doug,
One more question: so the sig have all T-test results of contrasts like [1 0 0 … 0], [0 1 0 ... 0], …, [0 0 0 … 1], right? or [1 -1/(N-1) -1/(N-1), … -1/(N-1)] ?
Best,
if you used the identity matrix then it is the first one
On 02/08/2017 08:43 AM, Seung-Goo KIM wrote:
Thank you very much, Doug,
One more question: so the sig have all T-test results of contrasts like [1 0 0 … 0], [0 1 0 ... 0], …, [0 0 0 … 1], right? or [1 -1/(N-1) -1/(N-1), … -1/(N-1)] ?
Best,
Seung-Goo KIM
On 2017-02-06, at 18:54, Douglas N Greve <greve@nmr.mgh.harvard.edu mailto:greve@nmr.mgh.harvard.edu> wrote:
yes, fsig is the F test. The sig has the result of all the individual t-tests
On 02/06/2017 08:41 AM, Seung-Goo KIM wrote:
Dear surfers,
I computed F-contrast using selxavg3-sess with an identity matrix as a contrast matrix. My question is about the result file “sig.*”. As far as I understand, the “sig.*” file contains signed-minnus-log-p-values (like, -log10(p)*Sign(t)) for a certain contrast.
So I expected the dimension should be #vertices-by-1, but the sig.* file is in the dimension of #vertices-by-1-by-1-by-#regressors. I would appreciate post-hoc tests after F-test, but the dimension doesn’t look like one… or is it? like i-th regressor v.s. (N-i) regressors? If one can tell where I can find p-values for the F-test, and what are the values in the sig.* file.
- wait. is "fsig.*” for the F-test? and “sig.*” for a set of
one-vs.-the-others contrasts? I would still appreciate if one can confirm it.
Best regards,
Seung-Goo KIM
Research Group for Cortical Networks and Cognitive Functions, Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstraße 1A, 04103 Leipzig, Germany. Phone: +49 341 9940 2618 | Fax: +49 341 9940 2624 http://www.cbs.mpg.de/~skim http://www.cbs.mpg.de/%7Eskimhttp://www.cbs.mpg.de/%7Eskim
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