Subject: Re: [Boost-bugs] [Boost C++ Libraries] #9183: quantile for poisson distribution - precision issue?
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-10-03 16:03:02
#9183: quantile for poisson distribution - precision issue?
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Reporter: tan@⦠| Owner: johnmaddock
Type: Support Requests | Status: new
Milestone: To Be Determined | Component: math
Version: Boost 1.54.0 | Severity: Showstopper
Resolution: | Keywords:
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Comment (by anonymous):
>By "in the general case", do you mean when x (in the example above) is
real, or that the "round trip" is also "bad" even when x is integral? Only
the latter case is important to us.
When x is integral and large there may be multiple (all integral) values
of x which all yield the same cdf, this usually occurs when the cdf is a
couple of epsilon less than 1, but I found a few cases for very small cdf
values as well. There's nothing that can be done about those cases -
other than moving to a type with more precision, or, in the case where the
cdf is near one, using complements instead.
-- Ticket URL: <https://svn.boost.org/trac/boost/ticket/9183#comment:4> Boost C++ Libraries <http://www.boost.org/> Boost provides free peer-reviewed portable C++ source libraries.
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