TS prescision - question - non-linear regression

["Prosper" <brente@xxxxxxxxxxxx>]

I have always wondered about non-linear regression ever since I heard it
mentioned some where on the Internet.

First. does anyone have a easy language function for non-linear regression
that they wouldn't mind sharing?

Second, if linear Regression is least squares, is non-linear regression most
squares?

Third, is non-linear regression useful to any of you traders out there?

Prosper