>>>>> "Manuel" == Manuel Morales <manuel.a.mora...@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
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