## 5.4 Heartbeat dynamics II

In the previous assignment, you were presented with three different time series of heartbeat intervals (HBI), and you analyzed them using a measure of Relative Roughness (RR; cf. Marmelat & Delignières, 2012).

A logical step is to unleash the full force of your new analytic toolbox onto the HBI series.

• Keep track of the outcomes of each time series for 4 different analyses (RR, PSD, SDA, DFA).
• Do the outcomes of the different methods converge on the continuum of blue, white and pink, to Brownian and black noise? That is, do they indicate the same type of temporal structure?
• As a final step, construct return plots for each time series and try to interpret what you observe, given the outcomes of the scaling parameter estimates.