Merge evoked data by weighted addition or subtraction.
all_evoked should have the same channels and the
same time instants. Subtraction can be performed by passing
Other than cases like simple subtraction mentioned above (where all
weights are -1 or 1), if you provide numeric weights instead of using
'nave', the resulting
.nave attribute (which is used to scale noise covariance when
applying the inverse operator) may not be suitable for inverse imaging.
The evoked datasets.
float| ‘equal’ | ‘nave’
The weights to apply to the data of each evoked instance, or a string
describing the weighting strategy to apply:
sum-to-one weights proportional to each object’s
'equal' weights each
1 / len(all_evoked).
The new evoked data.
New in version 0.9.0.