[R] Poission distribution
p.dalgaard at biostat.ku.dk
Wed Sep 20 21:59:17 CEST 2006
"Ethan Johnsons" <ethan.johnsons at gmail.com> writes:
> 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)
>  0.9974306
> not sure if ppois is the right one to use and the parameters...
I think not.
However, we're not doing your homework.
Instead, do the following
x <- 0:10
cbind(x, p=round(dpois(x, lambda=1.8),4))
plot(x, dpois(x, lambda=1.8), type="h", lwd=2)
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