From: Matt J on
"Samuel Edwards" <DJeter1234(a)AOL.com> wrote in message <i2pu5h$t78$1(a)fred.mathworks.com>...

>
> It's a numerical assessment of an 2-d integral defined over 2 regions, where the bounds of the second region are zeros of a function that 1) has a discontinuous derivative and 2) has has a standard normal cumulative density and probability density term involving the coefficients.
===============

OK, that does sound pretty hard, but what about my other question? Why write the function in terms of expressions 1/variance? This will make the function insensitive to incremental changes in large variance values. Why not define alternative parameters

p1,2,3=1/variance1,2,3

and express the function in terms of p1,2,3