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When you hunt for mean reversion on google you always find a reference to this Ornstein-Uhlenbeck process (or the Vasicek model in finance). You'll also find reference to this discrete equivalent AR(1) autoregressive process. The Ornstein-Uhlenbeck process is formulated as picture Where is the expression, #952# and; 963; are positive parameters. Wt is the Wiener process. I prefer writing this way: picture because today we see dx/dt as a velocity and dW/dt as noise. Wikipedia offers a picture of the development of the process: picture Wherever the beginning...