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another Poisson question

Posted By: docriver
Date: 22 Sep 01, 9:05 am

Given assumptions :
Shawn Estes averages 4.1 Ks per game
Bobby Jones averages 3.2 Ks per game

The line is Estes -.5 K Over Bobby Jones

if I use Poisson on Excel to look at Estes, the formula is
=Poisson(4.1-.5,3.2,1)which equals 60.25%.

but if I am looking at it from Bobby Jones's point of view, the formula is
=Poisson(3.2+.5,4.1) which equals 41.4%

The two probabiliites (60.25+41.4) add up to 101.65%. Other examples I've done yield bigger cumulative probabilites - up to 106%.
Why does it not equal exactly 100%? What am I doing incorrectly?

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Messages In This Thread

another Poisson question -- docriver -- 22 Sep 01, 9:05 am
See pages 164-169 of my book. (nt) -- Stanford Wong -- 22 Sep 01, 12:06 pm
excel -- docriver -- 22 Sep 01, 1:09 pm
2 Poisson functions calls isn't sufficient... -- Razor -- 22 Sep 01, 2:52 pm
Use our new Poisson link in the left frame -- Stanford Wong -- 26 Sep 01, 5:13 pm
Netscape?? -- Don Schlesinger -- 26 Sep 01, 5:37 pm
Neat, Stanford & David! (nt) -- Colin Caster -- 26 Sep 01, 7:54 pm

 

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