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Improvements in data acquisition and processing techniques have lead to an almost continuous ow of information for nancial data. High resolution tick data are available and can be quite conveniently described by a continuous time process. It is therefore natural to ask for possible extensions of nancial time series models to a functional setup. In this paper we propose a functional version of the popular ARCH model. We will establish conditions for the existence of a strictly stationary solution, derive weak dependence and moment conditions, show consistency of the estimators and perform a small empirical study demonstrating how our model matches with real data.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

A FUNCTIONAL VERSION OF THE ARCH MODEL