[R] ppois

Leeds, Mark (IED) Mark.Leeds at morganstanley.com
Thu Sep 28 16:07:37 CEST 2006

my guess is that ppois calculates greater than so ( since we are dealing
in a  discrete world )  greater than or equal to 33 is the same as
greater than 32.
But I am not familiar with ppois so you should check that this is what
is happening.

I think someone else already told you that you shouldn't use this site
for homework but I guess this could be not related to homework so I
answered ?

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Ethan Johnsons
Sent: Thursday, September 28, 2006 9:57 AM
To: r-help at stat.math.ethz.ch
Subject: [R] ppois

33 died overa 10-year period from COPD, whereas only 24 such deaths
could be expected based onstatewide mortality rates.

I came up with ppois(q = 33, lambda = 24, lower.tail = FALSE), but it
seems it is ppois(q = 32, lambda = 24, lower.tail = FALSE).

I am confused with the q value.  Why is it 32 instead 33?

thx much

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