[R] MLE in R

[Francisco J. Zagmutt]

Hello Liang,

Besides looking at ?optim, you may also want to look into this nice 
working example www.mayin.org/ajayshah/KB/R/documents/mle/mle.html

Regards,

Francisco

Francisco J. Zagmutt
Vose Consulting
1643 Spruce St., Boulder
Boulder, CO, 80302
USA
www.voseconsulting.com

Liang Wang wrote:
> Hi, dear R users
> 
> I am a newbie in R and I need to use the method of meximum likelihood to fit a Weibull distribution to my survival data. I use "optim" as follows:
> 
> 
> optim(c(1.14,0.25),weibull.like,mydata=mydata,method="L-BFGS-B",hessian = TRUE)
> 
> My question is: how do I setup the constraints that the two parametrs of Weibull to be pisotive?
> 
> Many thanks! Any comments are greatly appreciated!
> 
> Steven
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>