Thank you two of you very much for your help,
  I found the way to solve my problem.

Best wishes,
Tuan.

On Thu, Nov 6, 2008 at 4:14 PM, Rolf Turner <r.turner@auckland.ac.nz> wrote:

>
> On 7/11/2008, at 9:26 AM, Hoang Trong Minh Tuan wrote:
>
>  Hi all,
>>  So far I only know one way to get the confidence limit for the Poisson
>> distribution is to use the look-up table given by the 2 parameter (the
>> number of observation x and the confidence level, e.g. 95%) and the table
>> is
>> limit by the maximum number of observations (x <= 50).
>>  I know the formula to compute the CI, however, mathematically it is not
>> easy to do it. So, anyone know an R function to do this. Thanks
>>
>> Tuan.
>>
>
> You may find the URL
>
>        http://www.math.mcmaster.ca/peter/s743/poissonalpha.html
>
> useful.
>
>        cheers,
>
>                Rolf Turner
>
> P.S.  The foregoing URL discusses the issues in terms of a *single*
> observation.  Note that if X_1, ..., X_n are i.i.d. Poisson(lambda)
> then Y = X_1 + ... + X_n is Poisson(n*lambda).
>
> Note that the ``exact'' confidence limits are very conservative.
>
>                R. T.
>
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-- 
Hoang Trong Minh Tuan
PhD Student - Bioinformatics&Computational Biology
George Mason University,Fairfax, VA, US
HP: 703-473-1395

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