[R] Fitting my data to a Weibull model

[Marcio]

Hi djmuseR,
I tried installing and running the script that you suggested.
But with every value I tried for a, b, c and d I get one of those 2 error
messages

Error in nls(y ~ a - b * exp(-c * x^d), start = list(a = 10, b = 30, c =
0.4,  : 
  singular gradient

Error in numericDeriv(form[[3L]], names(ind), env) : 
  Missing value or an infinity produced when evaluating the model

Any ideas?

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