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From | Nick Cox <njcoxstata@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
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. Nick On Fri, Mar 23, 2012 at 12:22 PM, Keith Dear <keithdear4@gmail.com> 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- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/