Re: [R] Poission distribution

From: David Barron <mothsailor_at_googlemail.com>
Date: Wed 20 Sep 2006 - 20:01:37 GMT

Is that 6 deaths over 20 years? If so, the probability of getting exactly 6 deaths is given by

> dpois(6,1.8)

[1] 0.007808587

The probability of getting six or more deaths is 1 minus the result you obtained.

On 20/09/06, Ethan Johnsons <ethan.johnsons@gmail.com> wrote:
> The expected number of bladder cancer over next 20 years a tire
> industry is 1.8. Poission distribution is assumed to hold and 6
> reported deaths are caused by bladder cancer among the employees.
> Trying to find how unusual this event is.
>
> > ppois(q=6, lambda=1.8, lower.tail = TRUE, log.p = FALSE)
> [1] 0.9974306
>
> not sure if ppois is the right one to use and the parameters...
>
> thx much
>
> ______________________________________________
> R-help@stat.math.ethz.ch 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.
>

--
=================================
David Barron
Said Business School
University of Oxford
Park End Street
Oxford OX1 1HP


-- 
=================================
David Barron
Said Business School
University of Oxford
Park End Street
Oxford OX1 1HP

______________________________________________
R-help@stat.math.ethz.ch 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.
Received on Thu Sep 21 06:21:33 2006

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.1.8, at Wed 20 Sep 2006 - 20:31:28 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.