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Re: st: qplot , over()

From   Nick Cox <>
Subject   Re: st: qplot , over()
Date   Fri, 23 Mar 2012 12:36:05 +0000

In revising -qplot- for SJ 10-4 I inadvertently introduced a bug in
implementation of the -over()- option. I thought no one had noticed
but me, but Keith has been bitten by it.

The bug has already been fixed in a update due shortly in SJ 12-1. I
will send Keith a copy of the revised files.


On Fri, Mar 23, 2012 at 12:22 PM, Keith Dear <> wrote:

> How can I get several quantile plots in one diagram?
> (There have been past threads on this, but I found no mention of what
> I am getting.)
> sysuse auto
> replace mpg=mpg/2 if foreign   // for greater separation
> qplot mpg, by(foreign)      // two distinct curves, which I would like
> to plot together
> qplot mpg, over(foreign)  // points on a single curve, not what I expected
> Am I misunderstanding the help file? It seems to imply that by() and
> over() give the same set of curves, which is what I want but isn't
> what happens:
> ---- help qplot
> by(varname[, suboptions]) specifies that calculations be carried out
> separately for each distinct value of a
>        specified single variable. Results will be shown separately in
> distinct panels. See [G] by_option.
> over(varname) specifies that calculations be carried out separately
> for each distinct value of a specified
>        single variable.  Curves will be shown together within the
> same panel.  over() is only allowed with a single
>        varname.
> ----
> -qplot- is by NJC out of -net install gr42_5.pkg-

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