R-beta: qpois help

Martin Maechler maechler at stat.math.ethz.ch
Thu Mar 26 11:25:50 CET 1998

>>>>> "Bill" == Bill Simpson <wsimpson at uwinnipeg.ca> writes:

    Bill>      The Poisson Distribution

    Bill>           dpois(x, lambda) ....

    Bill>      Arguments:
    Bill>      lambda: vector of positive means.

    Bill> Isn't  lambda = 1/mean?

(maybe you are confusing with the  exponential distribution,
 where what S/R calls "rate" is often also written as \lambda in the text

PS. You could have tried 
	mean(rpois(1000, lambda = 10))
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