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Re: st: RE: -distplot- of multiple variables with variable used as symbol
--On 04 December 2002 12:07 +0000 Nick Cox <email@example.com> wrote:
So a possible work-around for users such as me in the meantime would be to :
I've encountered some strange behaviour in Nick Cox's
published in STB-51. It won't let me plot the distribution
more than one variable AND use another variable to label
although I can do either alone.
I'll use the automobile data to demonstrate so others can
try to replicate
the problem, although there's little purpose to the
commands in this
context - with my real data I'm comparing two distributions
hoped to label the points so I can identify outliers at the
(mainly for presentation purposes):
. use "C:\Program Files\StataSE\auto.dta"
(1978 Automobile Data)
. distplot length, c(J) s([rep78])
. * (worked fine)
. distplot length displacement, c(JJ) s(oo)
. * (also worked fine)
. distplot length displacement, c(JJ) s([rep78]o)
variable rep78 not found
. * Just to check I've got the syntax right in the s() option :
. graph length displacement weight, c(JJ) s([rep78]o)
. * (worked fine though a mess of a graph!)
. * describe my setup :
. which distplot
*! version 1.5.0 NJC 24 March 1999 [STB-51: gr41]
Anyone any idea what's going wrong here? That error
message seems most
bizarre to me - how can Stata suddenly not be able to find rep78 ??
No mystery here: although this behaviour is not
documented, it is a straightforward consequence
of the method used, as may be seen by looking at
-distplot- temporarily -preserve-s and then restructures
the data when you want a plot of more than one variable.
The rationale for doing this was, presumably, to allow
a plot of more than 20 variables. Occasionally one has
a large bundle of variables all of the same kind and
it is desired to see a spaghetti plot showing their
The side-effect, however, is that some variables in the
data set may disappear from sight while the graph is being produced.
A work-around would be for me to add an option specifying
variables which must be carried along, or for me to
parse the -sy()- argument and automatically identify
variables which the user clearly needs for the purpose.
I'll put that on a to-think-about list.
-reshape long- and use the by() option to -distplot- instead of multiple
Just tried this and it seems to work fine.
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