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Hi List,
a dimple question about using partial correlation (pcc.mgh) as effect size measure. I am running multivariate regression and setting positive and negative contrasts one variable at a time, e.g. a design matrix with columns like
Intercept Age Gender Fact1 Fact2 ....
and a bunch of contrasts like
0 0 0 1 0
0 0 0 -1 0
Now let's say the second contrast gives me a significant results after MC correction in a certain cluster, what sign should i expect in PCC in that cluster (on average)?
Thank you very much in advance,
Nicola
not sure what your question is. The pcc should have the same sign as the contrast.
On 09/13/2018 12:20 PM, Nicola Toschi wrote:
External Email - Use CautionHi List,
a dimple question about using partial correlation (pcc.mgh) as effect size measure. I am running multivariate regression and setting positive and negative contrasts one variable at a time, e.g. a design matrix with columns like
Intercept Age Gender Fact1 Fact2 ....
and a bunch of contrasts like
0 0 0 1 0
0 0 0 -1 0
Now let's say the second contrast gives me a significant results after MC correction in a certain cluster, what sign should i expect in PCC in that cluster (on average)?
Thank you very much in advance,
Nicola
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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Thank you Doug,
that was exactly the question...
it may be a trivial one but I have been messing aroung with several effects size calculation for a while and just wanted to make sure. So negative contrast (-1), negative beta.mgh, positive (?) gamma.mgh, and negative pcc.mgh withing the same significant cluster?
Thanks!!!
nicola
On 09/13/2018 07:39 PM, Douglas N. Greve wrote:
not sure what your question is. The pcc should have the same sign as the contrast.
On 09/13/2018 12:20 PM, Nicola Toschi wrote:
External Email - Use CautionHi List,
a dimple question about using partial correlation (pcc.mgh) as effect size measure. I am running multivariate regression and setting positive and negative contrasts one variable at a time, e.g. a design matrix with columns like
Intercept Age Gender Fact1 Fact2 ....
and a bunch of contrasts like
0 0 0 1 0
0 0 0 -1 0
Now let's say the second contrast gives me a significant results after MC correction in a certain cluster, what sign should i expect in PCC in that cluster (on average)?
Thank you very much in advance,
Nicola
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
gamma and pcc should be the same sign. The relationship to the sign of beta depends on your contrast. If beta is negative and your contrast element is negative, then you will get a positive gamma and pcc.
On 09/13/2018 02:15 PM, Nicola Toschi wrote:
External Email - Use Caution Thank you Doug,
that was exactly the question...
it may be a trivial one but I have been messing aroung with several effects size calculation for a while and just wanted to make sure. So negative contrast (-1), negative beta.mgh, positive (?) gamma.mgh, and negative pcc.mgh withing the same significant cluster?
Thanks!!!
nicola
On 09/13/2018 07:39 PM, Douglas N. Greve wrote:
not sure what your question is. The pcc should have the same sign as the contrast.
On 09/13/2018 12:20 PM, Nicola Toschi wrote:
External Email - Use Caution
Hi List,
a dimple question about using partial correlation (pcc.mgh) as effect size measure. I am running multivariate regression and setting positive and negative contrasts one variable at a time, e.g. a design matrix with columns like
Intercept Age Gender Fact1 Fact2 ....
and a bunch of contrasts like
0 0 0 1 0
0 0 0 -1 0
Now let's say the second contrast gives me a significant results after MC correction in a certain cluster, what sign should i expect in PCC in that cluster (on average)?
Thank you very much in advance,
Nicola
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
freesurfer@nmr.mgh.harvard.edu
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Douglas N. Greve -
Greve, Douglas N.,Ph.D.
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Nicola Toschi