mne.simulation.metrics.peak_position_error#
- mne.simulation.metrics.peak_position_error(stc_true, stc_est, src, threshold='50%', per_sample=True)[source]#
Compute the peak position error.
The peak position error measures the distance between the center-of-mass of the estimated and the true source.
\[PPE = \| \dfrac{\sum_i|s_i|r_{i}}{\sum_i|s_i|} - r_{true}\|,\]where \(r_{true}\) is a true dipole position, \(r_i\) and \(|s_i|\) denote respectively the position and amplitude of i-th dipole in source estimate.
Threshold is used on estimated source for focusing the metric to strong amplitudes and omitting the low-amplitude values.
- Parameters:
- stc_trueinstance of (Vol|Mixed)SourceEstimate
The source estimates containing correct values.
- stc_estinstance of (Vol|Mixed)SourceEstimate
The source estimates containing estimated values e.g. obtained with a source imaging method.
- srcinstance of
SourceSpaces
The source space on which the source estimates are defined.
- threshold
float
|str
The threshold to apply to source estimates before computing the recall. If a string the threshold is a percentage and it should end with the percent character.
- per_sample
bool
If True the metric is computed for each sample separately. If False, the metric is spatio-temporal.
- Returns:
Notes
These metrics are documented in [1] and [2].
New in version 1.2.
References
Examples using mne.simulation.metrics.peak_position_error
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Compare simulated and estimated source activity