Dear all,
If the four parameter curve I am thinking about is the right one then you can fit in one more parameter. I invite you to have a look at the paper: On the first crossing times of a Brownian motion and a family of continuous curves, L. Alili and P. Patie,
C. R. Acad. Sci. Paris, Ser. I 340 (2005) 225–228.
Regards,
L. Alili
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