Rick,
You can use the -twoway function- with -twoway histogram- to overlay a
normal curve.
For example,
Using the auto dataset, if you wanted a histogram of weight with the normal
density of only the foreign cars you could do the following:
. sysuse auto
(1978 Automobile Data)
. sum weigh if fore == 1
Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
weight | 22 2315.909 433.0035 1760 3420
. twoway histogram weight || function y=normden(x, 2316,433) , range(1760
3420) yvarlab("Normal density (foreign cars)") xtitle("Weight (lbs.)")
Hope this helps,
Scott
----- Original Message -----
From: "Richard Ittenbach" <[email protected]>
To: <undisclosed-recipients:>
Sent: Monday, April 26, 2004 5:02 PM
Subject: st: overlaying normal curve
> i want to put a normal curve over my histogram but stata only seems to
center the curve over the center of my distribution.
>
> i woud like to center it over what is considered to be the national
population mean (and not my mean, which is much lower than the population
mean). how can i shift the normal curve overlay to the right in my
histogram--we want to emphasize the heaviness of our tail?
>
> rick ittenbach
> children's hospital of philadelphia
>
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