Nonlinear Formula

Enter an expression in the S-Plus language specifying the nonlinear regression model. The variables used in the formula are the columns of the data set, the parameters to be estimated, and S-PLUS functions. The response variable appears first, followed by a tilde "~", and then the function to be minimized. For example:

y ~ b0 * exp(b1 * x)

For details on specifying formulas, see Nonlinear Regression Model , or the chapter on Nonlinear Models in the Guide to Statistics.