nls factor

"Manuel" == Manuel Morales <Manuel.A.Morales at williams.edu> writes:

> nls(y ~ a[fac]*x^b, start=list(a=c(1,1), b=0.25))

Did you mean a[f]?

nls(y ~ a[f]*x^b, start=list(a=c(1,1), b=0.25))

Mike