[R] How to superimpose a histogram and density plot

[Peter B. Mandeville]

NCSS has a nice plot of the histogram and density plot superimposed. The
S-PLUS 4 Guide to Statistics on page 45 suggests the following code for a
general purpose density plot for a vector named data

iqd <- summary(data)[5]-summary(data)[2]
plot(density(data,width=2*iqd),xlab="x",ylab="",type="l")

Is it possible to superimpose the density plot on a histogram produced with
hist()? I tried lines(density(data,width=2*iqd),type="l") but the results
weren't satisfactory.

Thank you,

Peter B.

--
Peter B. Mandeville                             mandevip at deimos.tc.uaslp.mx
Jefe del Depto. de Informática y Bioestadística rpe1531 at pasteur.fmed.uaslp.mx 
Facultad de Medicine                            Tel: 48 26-23-45 ext. 232
Universidad Autónoma de San Luis Potosí         Fax: 48 28-23-52
Av. V. Carranza 2405
Col. Los Filtros
Apartado Postal 145
San Luis Potosí, S.L.P.
78210 México

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