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st: legend in -twoway line-


From   "Sascha O. Becker" <sascha.becker@gmx.de>
To   statalist@hsphsun2.harvard.edu
Subject   st: legend in -twoway line-
Date   Tue, 02 Mar 2004 13:30:21 +0100

Dear Nick,

thanks for your very helpful suggestion on -separate- and -labutil- !

One thing I was not able to resolve, though, is how to get the legend
labels "automated". The way I understand the -legend- option in -twoway line- is that the -legend- option only allows to change
labels one by one, so it does not seem to be possible to attach pre-defined labels as if it were value labels.

One has to specify the legend with each single label in brackets
(e.g. legend(label (1 "Employees") (2 "Self-Employed") )
which does not seem to lend itself to sdavemthing like

legend(mylabel)

where mylabel is a "standard" value label

Is there a workaround for this as well?

Cheers, Sascha


Date: Mon, 1 Mar 2004 13:23:39 -0000
From: "Nick Cox" <n.j.cox@durham.ac.uk>
Subject: st: RE: looping over a series of line plots

Something like this may help. In this - -labnoeq- is in -labutil- on SSC.
foreach v of var <whatever> {
preserve collapse `v', by(year occ)
separate `v', by(occ) short local vars "`r(varlist)'" labnoeq `vars' local vlabel "`:variable label `v''"

twoway line `vars' year, ///
xtitle("Year") ytitle(`vlabel') /// title("`vlabel'-type of occupation") restore }

Nick n.j.cox@durham.ac.uk
Sascha O. Becker


I have micro data on individuals and the following variables:
different wage and income measures, working status (3 categories) and
year I and would like to plot trends in all of those wage and income
measures across occupations and produce simple line plots.
Since I want to produce a whole series of similar plots, I was
looking for a smart way to save on code but I got stuck.
Here is what I do to produce a single graph (my question follows below
the code):

******* BEGIN OF CODE

collapse wage, by(year occ);

g wageocc1=wage if occ==1;
g wageocc2=wage if occ==2;
g wageocc3=wage if occ==3;

collapse (sum) wageocc*, by(year);

list;

twoway line wageocc* year,
xtitle("Year")
ytitle("Hourly Wage")
title("Hourly Wage by type of occupation")
legend(label (1 "Employees") (2 "Self-Employed") (3 "Not
employed");

******* END OF CODE


My question is how I might automatize a whole series of graphs.
Here is what I thought I could do:


+++++++++++

foreach var in varlist {

collapse `varname', by(year occ);
...
...

twoway line `varname'occ* year,
xtitle("Year")

ytitle(-variable label-) <<------- Here I would like to have
the variable label of that variable which I currently loop about

title(-variable label-"type of occupation") <<------- Here I
would like to have the variable label
of that variable which I currently looped about

legend(label (1 "Employees") (2 "Self-Employed") (3 "Not
employed"); <<------- Here I would like to have the
VALUE
labels of the working
status/occupation variable, so
something like -legend (label occlabel)-

}

+++++++++++


However, it seems that I do not get this to work the way I want: e.g.
the -legend- option only allows to change
labels one by one, so it does not seem to be possible to attach
pre-defined labels.
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