Assess PPG signal quality

Computes population skewness and raw kurtosis, either per channel or in non-overlapping windows.

Usage

ppgQuality(x, window_sec = NULL, skew_threshold = -0.3, assay_name = NULL)

Arguments

x

A PPG PhysioExperiment.

window_sec

Optional non-overlapping window duration in seconds.

skew_threshold

Minimum skewness SQI accepted as usable.

assay_name

Optional raw PPG assay name.

Value

A data frame with channel, segment, start time, skewness SQI, kurtosis SQI, and acceptance flag.

References

Elgendi M (2016). Optimal signal quality index for photoplethysmogram signals. Bioengineering, 3:21. doi:10.3390/bioengineering3040021

Examples

simulation <- make_ppg(n_time = 2000)
ppgQuality(simulation$pe)
#>   channel segment start_sec    s_sqi    k_sqi accept
#> 1       1       1         0 1.998507 6.479899   TRUE