While the international radio regulations (RR) do not prevent opportunistic access, the application of these regulations largely does not encourage such a concept. This is due to the existence of different elements of restriction within these regulations including the absence of a quantified...

This paper analyses the long-memory properties of high frequency financial time series. It focuses on temporal aggregation and the influence that this might have on the degree of dependence of the series. Fractional integration or I(d) models are estimated with a variety of specifications for...

This paper uses fractional integration methods to measure the degree of persistence in historical annual data on the world population over the period 1800-2016. The analysis is carried out for the original series, and also for its log transformation and its growth rate. The results indicate that...