Extending the volatility concept to point processes

Volatility is a vague concept that can be made precise in a number of ways. This paper investigates the concept for point processes in the time domain. There is review of the time series case, then a volatility measure is developed. Next it is applied to some biomedical data based, running rate intervals of the heart beating. It is seen in the work that in some cases time series volatility might be generated by point process volatility.