Sample path deviations of the Wiener and the Ornstein-Uhlenbeck process from its bridges

Details Sample path deviations of the Wiener and the Ornstein-Uhlenbeck process from its bridges Sample path deviations of the Wiener and the Ornstein-Uhlenbeck process from its bridges

2010-11-02

arxiv.org/abs/1011.0548v3

Mathematics

Probability

37 pages

Scientific paper

We study sample path deviations of the Wiener process from three different representations of its bridge: anticipative version, integral representation and space-time transform. Although these representations of the Wiener bridge are equal in law, their sample path behavior is quite different. Our results nicely demonstrate this fact. We calculate and compare the expected absolute, quadratic and conditional quadratic path deviations of the different representations of the Wiener bridge from the original Wiener process. It is further shown that the presented qualitative behavior of sample path deviations is not restricted only to the Wiener process and its bridges. Sample path deviations of the Ornstein-Uhlenbeck process from its bridge versions are also considered and we give some quantitative answers also in this case.

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