Re: [R] ppois

From: Leeds, Mark (IED) <Mark.Leeds_at_morganstanley.com>
Date: Thu 28 Sep 2006 - 14:07:37 GMT


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@stat.math.ethz.ch
[mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of Ethan Johnsons Sent: Thursday, September 28, 2006 9:57 AM To: r-help@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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