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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>
--
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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