# [Rd] bug in histogram rendering (PR#1080)

**ripley@stats.ox.ac.uk
**
ripley@stats.ox.ac.uk

*Thu, 30 Aug 2001 07:56:41 +0200 (MET DST)*

On Thu, 30 Aug 2001 ljlehou@sandia.gov wrote:
>* Full_Name: Leslea J. Lehoucq
*>* Version: 1.3.0
*>* OS: Solaris 7
*>* Submission from: (NULL) (134.253.26.10)
*>*
*>*
*>* When one creates a histogram with the freq=FALSE (i.e. plot
*>* the density on the Y-axis), the density values are off by a
*>* factor of 10. For instance, a bin in which 50% of the plotted
*>* values fall is marked 0.05, not 0.50, on the Y-axis. Instead
*>* of the density summing to 1.0, it sums to 0.1.
*
It should integrate to one, not sum to one.
Can you give us an example of what you think is wrong?
For example,
set.seed(1)
Y <- runif(100)
hist(Y, freq=F)
correctly has an average level of 1, sum 5.
Calling them `relative frequencies' is perhaps misleading (relative to
what?), but then what hist() does by default is not a histogram in the
terminology in use in much of the world. Some of also argue it is
extremely misleading unless the bins are all of the same width.
--
Brian D. Ripley, ripley@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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