[Mne_analysis] Which time points should I use to compute the covariance matrix?

[Tal Linzen]

Dear MNE users,

I'm running a single-trial analysis on epoch data. I'm not sure what "tmin"
and "tmax" should be set to in the covariance description file. The template
at share/mne/mne_browse_raw/templates/sample.cov only uses the baseline
period (200 ms before each trial). Other description files I've seen use the
whole epoch. Which way is better?

A related question -- the manual recommends specifying the option
"keepsamplemean", but it doesn't appear in the template. Are there cases in
which this option should not be set?

Thanks in advance.

Tal Linzen,
Neurolinguistics lab, New York University
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