ABSTRACT

This chapter is about periodicity (the quality of recurring at a regular interval). A random time series doesn't have any periodicity. A chaotic time series may or may not have periodicity. Consequently, any test for periodicity can't, by itself, indicate chaos. However, knowing whether or not a time series is periodic is important information that suggests how to proceed in a chaos analysis. In addition, a test for periodicity can reveal autocorrelation.