Figure 3 Sampling reduction of autocorrelation Oxygen Saturation Figure 4 illustrates a graph of our oxygen saturation results. As the number of data skipped increases, the autocorrelation goes down. Figure 4 is typical of the results we obtained. We do not know why the simulation data had a 9 percent reduction, the oxygen saturation data had a 20 percent reduction, and the heart rate had a 30 percent reduction. We know that real data both oxygen saturation and heart rate data includes changes in addition to autocorrelation.
Simulation only includes the autocorrelation changes.
The 9 percent reduction of the simulation data could be taken as a minimum when no other aspect of the data are changing. The patterns for these oxygen saturation and heart rate look different. Our experience tells us that the oxygen saturation data are more autocorrelated than the heart rate data. Figure 7 Heart rate autocorrelation Conclusions Skipping data reduces autocorrelation. The amount of reduction is a function of the data.