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proc nlin - input model function

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proc nlin - input model function

I am trying to find a functino that find the best-fit function according to some data points that I have. I am doing that with proc nlin, and have succeeded at computing it with a logarithmic model function. Currently I am trying to do it with a different model function* but I haven't managed to make it work.

 

I think I may be inputting the function with the wrong expression.

 

* The model function is the Weibull distribution whose expression is f(t) = 1 - e^(-(t/a)^b);

PROC NLIN DATA=aux_&s
	MAXITER=500
	CONVERGE=1E-05
	SINGULAR=1E-08
	MAXSUBIT=30
	OUTEST=coeficientes_segmento&s 
NOITPRINT ; model segmento11 = (1 - (EXP(-(t/a)**b))); *Weibull distribution function; ; PARMS a=0.4 b=0.5 ; RUN;
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