[R] Confidence limits for the parameter of the Poisson distribution

[Charles C. Berry]

On Thu, 6 Nov 2008, 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


A 'marriage-of-convenience' between uniroot() and ppois() should do it.

HTH,

Chuck


>
> Tuan.
>
> 	[[alternative HTML version deleted]]
>
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Charles C. Berry                            (858) 534-2098
                                             Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	            UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901