Message-ID: <AANLkTik6qAwA+131E4gt-==iSe0Pw=dhvbusMKB71ct7@mail.gmail.com>
Date: 2011-01-16T14:44:14Z
From: Hadley Wickham
Subject: rootogram for normal distributions
In-Reply-To: <alpine.DEB.2.00.1101161526120.22514@paninaro.uibk.ac.at>
> The normal distribution is a continuous distribution, i.e., the frequency
> for each observed value will essentially be 1/n and not converge to the
> density function. Hence, you would need to look at histogram or smoothed
> densities. Rootograms, on the other hand, are intended for discrete
> distributions.
I don't think that's true - rootograms are useful for both continuous
and discrete distributions. See (e.g.) p 314 at
http://www.edwardtufte.com/tufte/tukey, where Tukey himself uses a
rootogram with a normal distribution.
Hadley
--
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/