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Science Forum Index » Space - Consult Forum » BP1CI -- Free program for Clopper Pearson Conf...
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| Author |
Message |
| Barry W Brown... |
 Posted: Mon Jun 23, 2008 5:21 am |
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Guest
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DESCRIPTION
BP1CI (Binomial Poisson 1-sample Confidence Intervals) calculates
exact confidence limits on the probability of event for the one-sample
binomial distribution or on the total number of events for the
one-sample Poisson distribution using the Clopper-Pearson method.
HOW TO GET IT
The program is free (no charge, Fortran 95 source included) and is
available
from the following URL. The distribution includes source,
documentation,
a Win32 executable and a MAC executable.
http://biostatistics.mdanderson.org/SoftwareDownload
WHAT'S NEW?
This is an update which improves the user interface. The program
still
runs only at the command line -- no gui, sorry.
EXAMPLES:
What is the 95% Clopper-Pearson confidence interval when 3 out of 20
trials yield an event?
Answer: [0.0321,0.3789]
What is the 95% CI on the Poisson mean, when a Poisson process yields
100 events?
Answer: [82.266,121.63]
COMMENT:
On one of the groups to which this was posted, it was asked whether
there is a formula for the Clopper-Pearson CI. The answer is yes, but
it involves the inverse of the F distribution (for the binomial) or
the chi-square (for the Poisson) and so is not usually terribly
useful. BP1CI computes these inverses. |
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