pyActigraphy.light.LightMetricsMixin.MLiTp

LightMetricsMixin.MLiTp(threshold)

Mean light timing per day.

Mean light timing above threshold, MLiT^C, per calendar day.

Parameters

threshold (float) – Threshold value.

Returns

MLiTp – A pandas DataFrame with MLiT^C per channel and per day.

Return type

pd.DataFrame

Notes

The MLiT variable is defined in ref [1]:

\[MLiT^C = \frac{\sum_{j}^{m}\sum_{k}^{n} j\times I^{C}_{jk}}{ \sum_{j}^{m}\sum_{k}^{n} I^{C}_{jk}}\]

where \(I^{C}_{jk}\) is equal to 1 if the light level is higher than the threshold C, m is the total number of epochs per day and n is the number of days covered by the data.

References

1

Reid K.J., Santostasi G., Baron K.G., Wilson J., Kang J., Zee P.C., Timing and Intensity of Light Correlate with Body Weight in Adults. PLoS ONE 9(4): e92251. https://doi.org/10.1371/journal.pone.0092251