It is truncated from left.

On Mon, May 16, 2011 at 6:33 PM, Greg Snow <Greg.Snow@imail.org> wrote:

> Which direction is it truncated?  (only values less than a allowed or only
> greater?).
>
> One simple approach is rejection sampling, just generate from a regular
> poisson distribution, then throw away any values in the truncated region.
>  Another approach if the legal values are those from 0 to a, so that there
> is a finite number of possibilities, then you can use the sample function
> with replace=TRUE and using probabilities from the poisson in the legal
> range.
>
> -----Original Message-----
> From: r-help-bounces@r-project.org [mailto:r-help-bounces@r-project.org]
> On Behalf Of cassie jones
> Sent: Monday, May 16, 2011 5:28 PM
> To: r-help@r-project.org
> Subject: [R] simulation from truncated poisson
>
> Dear all,
>
> I need to simulate values from a Poisson distribution which is truncated at
> certain value 'a'. Can anyone tell me if there is in-built package in R
> which can simulate from a truncated Poisson? If not, what should be the
> steps to write a function which would do that?
>
> Thanks in advance.
>
>
> Cassie
>
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>
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