Homework?? We don't do homework here. If not,  ?optim or look at the CRAN
"Optimize" task view for optimizers. There is even a maxLik package that
might be useful.

-- Bert

On Mon, Jul 2, 2012 at 8:58 PM, Ali Tamaddoni <alicivilizationi@gmail.com>wrote:

> Hi All
>
>
>
> I have a data frame called "nbd" with two columns (x and  T). Based on this
> dataset I want to find the parameters of a distribution with the following
> log-liklihood function and with r and alpha as its parameters:
>
> log(gamma(nbd$x+r))-log(gamma(r))+r*log(alpha)-(r+nbd$x)*log(nbd$T+alpha)
>
> the initial value for both parameters is 1.
>
>
>
> I would be thankful if you could help me to solve this problem in R.
>
>
>
> Regards,
>
>
>
> Ali
>
>
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>
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm

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