Presence ratio (presence_ratio)¶
Calculation¶
Presence ratio is the proportion of discrete time bins in which at least one spike occurred.
\[\textrm{presence ratio} = \frac{B_s}{B_s + B_n}\]
\(B_s\) : number of bins in which spikes occurred.
\(B_n\) : number of bins in which no spikes occurred.
Expectation and use¶
Complete units are expected to have a presence ratio of 90% or more. Low presence ratio (close to 0) can indicate incompleteness (type II error) or highly selective firing pattern.
Example code¶
import spikeinterface.qualitymetrics as qm
# Make recording, sorting and wvf_extractor object for your data.
presence_ratio = qm.compute_presence_ratio(wvf_extractor)
# presence_ratio is a dict containing the units' ID as keys
# and their presence ratio (between 0 and 1) as values.
Links to source code¶
From SpikeInterface
From the AllenSDK
References¶
Literature¶
Unknown origin.