[R] estimating rho of Poisson distributed data

[David Winsemius]

On Jan 15, 2010, at 9:46 AM, Titus von der Malsburg wrote:

> On Fri, Jan 15, 2010 at 09:19:23AM -0500, David Winsemius wrote:
>>
>> On Jan 15, 2010, at 5:59 AM, Titus von der Malsburg wrote:
>>
>>> Mean and variance of Poisson distributed data are specified by \rho.
>>> How can I estimate \rho for a set of measurements in R?
>>
>> rho <- mean(x)
>
> Yeah, thanks :-)

Hey, ask a simple question,  get a simple answer.

> I was looking for a general way to fit a
> distribution.  Should've made that clear.  I'm surprised that nobody
> is complaining because I called lambda rho!

There is a fitdistr function in MASS which would be extreme overkill  
for the problem posed and:

http://cran.r-project.org/doc/contrib/Ricci-distributions-en.pdf

What other trivial searching can I do for you?

-- 

David Winsemius, MD
Heritage Laboratories
West Hartford, CT