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Science Forum Index » Space - Consult Forum » CONFINT15 - Sample size needed to control length of...
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| Barry W Brown... |
 Posted: Mon Jun 23, 2008 6:16 am |
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Guest
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CONFINT15
DESCRIPTION
This program performs calculations of the probability that a specified
one-group study (specification includes sample size) will produce a
confidence interval (CI) of at most a particular length. It also
calculates the sample size necessary to achieve a desired such
probability.
CONFINT15 will perform calculations for
One-sample binomial
One-sample Poisson
Mean of the One-Sample Normal
SD of the One-Sample Normal
Hazard of One-Sample Exponential Survival Distribution
Mean survival of the One-Sample Sirvival Distribution
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 now includes the survival calculations and the
standard deviation of the normal distribution.
EXAMPLE:
The true probability of an event is 0.5. We want a study large enough
that the probability that a 95% confidence interval (via
Clopper-Pearson) has length at most 0.1 is 80%. What sample size is
required?
Answer: 403
COMMENT: I recently announced BP1CI. This is a totally different
program. BP1CI is used to obtain a CI when the data is at hand.
CONFINT15 is used to plan a study (particularly the sample size) and
there no data is involved in its use. |
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