Fractals and Stochastic Calculus

Just another weblog

Maximum of Wiener Brownian Motion

Let W_0 be the standard Wiener Brownian Motion process, and M(t) defined as M(t)=\max_{0 \leq s \leq t} W_{0}(t), we then have the following result:

P(M(t) \geq x)= 2(1-\phi(\frac{x}{\sqrt{t}}))

where \phi denotes the standard normal cumulative distribution function:

\phi(z)=\frac{1}{\sqrt{2\pi}}e^{-z^{2}/2} \forall{z}\in\mathbb{R}

This result is simply a direct application of Theorem 2 from this paper with \alpha=0


May 4, 2009 Posted by | Wiener Brownian Motion | Leave a comment