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[mathcad] Re: rgeom mistake?
| [mathcad] Re: rgeom mistake? |
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Author: Andy Spragg
Posted: Wed, 11 Jan 2006 17:55:01 +0000
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To add further confusion, there is the do-you-count-from-1 or
do-you-count-from-0 issue. It might be interesting to change the array
base in the options and seeing if this changes the results you get ...
Andy
Chris Whitford "chw"
11/01/2006 17:25
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[mathcad] Re: rgeom mistake?
According to http://en.wikipedia.org/wiki/Geometric_distribution there are
2 alternative definitions: the number of trials until the first success,
or the number of trials before the first success.
Chris
At 16:25 11/01/2006 +0100, you wrote:
When using rgeom to simulate the geometric random variable G I have
values of 0 - which isn't possible for the "trial number
on which the first success occurs". The Help file (and my 2001i manual)
have p(1-p)^k for the probability
of G=k. An exponent k explains why G can indeed by 0 - however every
probability textbook I check
tells me the exponent is k-1, not k, with a smallest possible value of G
equal to 1 and not 0.
+ Chris Whitford
+ Research Fellow, University of Leicester, Space Research Centre,
+ Physics and Astronomy Department, University Road, LEICESTER LE1 7RH, UK
+ Tel: +44 (0)116 252 3496, Fax: +44 (0)116 252 2464
+ email: "chw" http://www.star.le.ac.uk/
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