## inverse poisson using perl (Math::CDF)

## inverse poisson using perl (Math::CDF)

(OP)

Hi,

I'm work on probabilities and I'm looking for a perl module that mimics the excel POISSON(x,mean,cumulative) function where cumulative = False.

The only module I have come across that is close is the Math::CDF distribution however by default the this works with cumulative probabilities which unfortunately for my purpose is no good.

I would be interested to know if anyone has came across this scenario before or has any useful tips or pointers?

Thanks

spperl

I'm work on probabilities and I'm looking for a perl module that mimics the excel POISSON(x,mean,cumulative) function where cumulative = False.

The only module I have come across that is close is the Math::CDF distribution however by default the this works with cumulative probabilities which unfortunately for my purpose is no good.

I would be interested to know if anyone has came across this scenario before or has any useful tips or pointers?

Thanks

spperl

## RE: inverse poisson using perl (Math::CDF)

However the POISSON function is quite simple to code: in the module Math::BigFloat you have the factorial function, if you need to use big numbers, otherwise that's quite simple to code (untested).

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## RE: inverse poisson using perl (Math::CDF)

Thanks for your reply and taking the time to do this. I did end up coding manually.

So thanks again!