# Nls

### Nonlinear Regression in R

The examples in this post is taken from a class I took at the University of Missouri. These examples are originally provided in SAS and I translated them to R. Non-linear Regression with Available Starting Values The velocity of a chemical reaction ($$y$$) is modeled as a function of the concentration of the chemical ($$x$$). There are a total of 18 observations. The desired model is \[ y_i = \frac{\theta_0 x_i}{\theta_1 + x_i} + \epsilon_i.