A histogram has area one, not sum one. From ?truehist Details:
This plots a true histogram, a density estimate of total area 1. On Sat, 8 Mar 2003, juli g. pausas wrote: > Hi, > This is a very basic question, but I would like to undestand hist(). I > thought that the hist( , freq=FALSE) should provide the relative > frequencies (probabilities), and so they should sum 1, however: > > set.seed(2) > ah <- hist(rnorm(100), freq=F) > sum(ah$intensities) > [1] 2 > > set.seed(2) > bh <- hist(rlnorm(100), freq=F) > sum(bh$intensities) > [1] 0.4999996 > > I'm getting similar figures with truehist() in MASS. > So I suppose I'm misunderstanding hist(). Any help? > > Thanks > > Juli > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > -- Brian D. Ripley, [EMAIL PROTECTED] 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 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help