Hi Derek,
have a look at the following made-up example:
f1 <- function(x){2*x}
f2 <- function(x){-10*x+1}
x<-rnorm(10)
x
(x<0)*f1(x)
(x>=0)*f2(x)
(x<0)*f1(x) + (x>=0)*f2(x)
Therefore I suggest you should specify the model as follows:
yourNLSmodel <- nls(Y ~ (X<Z) * f(X,a,b,c) + (X>=Z) * g(X,a,d,e), data =
myData, ...)
Christian
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