Fig. 4.

Comparison of the prediction power on sleep-wake state by four methods of data processing. Data summation (blue line), moving average (margenta line), tolerance (cyan line) and data summation after a 120-second leading moving average (red line). Data summation (blue line) shows an initial increase before 100-second, a plateau around 0.94 after 300 seconds. Moving average (margenta line) initially displays a similar pattern like data summation and the maximal area under the curve (AUC) value is observed around the 120 seconds. Then, the AUC value slightly decreased to around 0.86 after the 200 seconds. Permission way (cyan line) presents the initial increase up to 0.8 around in 10 seconds and then gradual descent to around 0.5 is observed. Combination way (red line) using the data summation after the 120-second leading moving average shows a slight increase of the AUC value up to 0.94 almost identical to data summation after the 200 second durations.