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 <[EMAIL PROTECTED]> 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 > > ______________________________________________ > [email protected] 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 ______________________________________________ [email protected] 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.
