nl¶ Fit a nonlinear regression model. When to use How do I estimate a nonlinear relationship that cannot be written as a linear model? Syntax¶ nl y = <expression> [, params(name...) start(value...) options] Examples¶ nl cost = a + b * exp(c * age), params(a b c) start(1 1 1) See also¶ Command Reference Index User Guide In-App Help System