Second-order moments, as even functions in time, are conventionally regarded as containing no information about the time irreversible nature of a sequence and therefore about its frequency asymmetry. However, this paper shows that the frequency asymmetry produces a clearly distinct behaviour in...

We demonstrate that the process of generating smooth transitions Call be viewed as a natural result of the filtering operations implied in the generation of discrete-time series observations from the sampling of data from an underlying continuous time process that has undergone a process of...

A methodology is offered which can be used to construct an econometric model in the presence of structural change of an evolutionary type. The theoretical basis for such modelling is drawn from the self-organisation approach and operationalised in the context of the logistic diffusion growth...