Table 2. Currently available quality metrics in Spikeinterface.

Re-implemented by researchers at Allen Institute for Brain and by the SpikeInterface team.

Metric	Description	Reference
Signal-to-noise ratio	The signal-to-noise ratio computed on unit templates.	N/A
Firing rate	The average firing rate over a time period.	N/A
Presence ratio	The fraction of a time period in which spikes are present.	N/A
Amplitude Cutoff	An estimate of the miss rate based on an amplitude histogram.	N/A
Maximum drift	The maximum change in spike position (computed as the center of mass of the energy of the first principal component score) throughout a recording.	N/A
Cumulative drift	The cumulative change in spike position throughout a recording.	N/A
ISI violations	The rate of inter-spike-interval (ISI) refractory period violations.	Hill et al., 2011
Isolation Distance	Radius of the smallest ellipsoid that contains all the spikes from a cluster and an equal number of spikes from other clusters (centered on the specified cluster).	Harris et al., 2001
L-ratio	Assuming that the distribution of spike distances from a cluster center is multivariate normal, L-ratio is the average value of the tail distribution for non-member spikes of that cluster.	Schmitzer-Torbert and Redish, 2004
D-Prime	The classification accuracy between two units based on linear discriminant analysis (LDA)	Hill et al., 2011
Nearest-neighbors	A non-parametric estimate of unit contamination using nearest-neighbor classification.	Chung et al., 2017
Silhouette score	The ratio between cohesiveness of a cluster (distance between member spikes) and its separation from other clusters (distance to non-member spikes).	Rousseeuw, 1987