Thanks for the help. I appreciate.

On Mon, May 16, 2011 at 10:19 PM, Greg Snow <greg.s...@imail.org> wrote:

> So there is no maximum value, just a minimum (greater than 0)? Correct?  In
> that case the sample option will not work (unless you choose some really
> high value and say that you won’t go above that), but the rejection sampling
> would still work.  How efficiently it works will depend on how much
> probability a regular poisson would put into the truncated region.
>
>
>
> Another possibility is to find the probability of being in the truncated
> region, then generate a uniform between that value and 1, then feed that
> uniform into the qpois function.
>
>
>
> *From:* cassie jones [mailto:cassiejone...@gmail.com]
> *Sent:* Monday, May 16, 2011 7:46 PM
> *To:* Greg Snow
> *Cc:* r-help@r-project.org
> *Subject:* Re: [R] simulation from truncated poisson
>
>
>
> It is truncated from left.
>
> On Mon, May 16, 2011 at 6:33 PM, Greg Snow <greg.s...@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-boun...@r-project.org [mailto:r-help-boun...@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
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>
>

        [[alternative HTML version deleted]]

______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Reply via email to