Nelson,
I do not know of any formal hypothesis testing mechanism, but I recommend a
QQ plot regardless. Venables and Ripley (2002, 4th edition MASS) have a
detailed example for the mixed normal case (see page 440 in particular) that
could be adapted for your normal + weibull case. Or you could construct the
model quantile portion yourself.

Hope that helps,
Bill

-------------------------------
Bill Pikounis, PhD

Nonclinical Statistics
Centocor, Inc.
> -----Original Message-----
> From: r-help-bounces@stat.math.ethz.ch
> [mailto:r-help-bounces@stat.math.ethz.ch]On Behalf Of nelson -
> Sent: Monday, November 06, 2006 9:58 AM
> To: r-help@stat.math.ethz.ch
> Subject: [R] goodness of fitting for a mixed distribution
> 
> 
> Hi all!
>   i have done a fitting of experimental data using optim function and
> setting up my mixed distribution logliklehood (it is a linear
> combination of a normal and a weibull distribution). How can i test
> the goodness of fit? I want to be able to say that my distribution fit
> the data at 90%, 95% or so on....
> 
> thanks in advance,
>   nelson
> 
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