Note the simple but crucial detail: you must specify an sd as well as a
mean for
a superimposed normal. You could use that of the data, but you must
specify one.
Nick
Maarten buis
--- Ana Gabriela Guerrero Serdan <[email protected]> wrote:
> Sorry, my mean (not median) is -1 so I want a
> hypothetical normal distribution to be centered around
> 0 not -1. The reason is that I would like to compare
> the distribution of my sample to a hypothetical
> distribution. So I want to plot both distributions in
> the histogram.
What about this:
*-------------------- begin example ------------------------
sysuse auto, clear
sum mpg
local sd = r(sd)
hist mpg, ///
plot(function y = normden(x,30,`sd'), range(12 41)) ///
legend(order(1 "density" ///
2 "theoretical" "normal"))
*-------------------- end example --------------------------
(For more on how to use examples I sent to the Statalist, see
http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )
*
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