[Mne_analysis] Epoch mode covariance estimation

Alexandre Gramfort gramfort at nmr.mgh.harvard.edu
Fri Sep 14 03:28:10 EDT 2012
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hi Kambiz,

you can take a look at the python function for this:

https://github.com/mne-tools/mne-python/blob/master/mne/cov.py#L240

it reproduces the C code.

HTH

Alex

On Fri, Sep 14, 2012 at 2:18 AM, Kambiz Tavabi <ktavabi at uw.edu> wrote:
> Hi all,
> I wonder if someone could clarify a detail concerning the calculation of
> the covariance matrix in epoch mode when the KEEPSAMPLEMEAN option is
> specified.
> On page 89 of the MNE manual (version 2.7.3) the formulation for the
> covariance matrix is unclear on the limit of the sum of samples (j). My
> question is whether the limit is the number of samples (Nr) in the
> entire epoch, or just the baseline/pre-stimulus period?
>
> Thanks
> Kambiz
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