Tuesday, March 14, 2006

Re: st: legend on graph help

In a response to Scott C., Scott M. wrote, among other things:

2. It doesn't appear that the -legend(order())- (or the ytitle, yscale....) are attached to one of the -line- commands.

- and suggested:

twoway line mpg price if fore == 0 ,sort lc(blue) lp(dash) /// || line mpg price if fore == 1 , sort lc(black) /// legend(order(1 "white sex ratio" 2 "black sex ratio"))


Stata graph commands can be complex; I think it is helpful to keep the terminology straight:

-line- is not a command; it is a plot specification as part of a -twoway- graph command.

The legend() option is an option to the graph command, not to a plot specifation. So it should not be "attached to one of the -line- commands".

Personal view: I think the || notation is a lot less transparent than the () notation. So I would write the above command:

twoway /// (line mpg price if fore == 0 , sort lc(blue) lp(dash)) /// (line mpg price if fore == 1 , sort lc(black)) /// , /// legend(order(1 "white sex ratio" 2 "black sex ratio"))

Here we have a graph command (twoway) with two plot specifications (line); each plot specification has options (sort, etc.). The graph command also has an option: (legend()). ytitle() and yscale() would be graph options, too. I gave the comma separating the graph command body from the graph options a line of its own, just for visual clarity.

Stata often can be quite tolerant to deviations from the strict rules, as Scott M.'s example shows (it actually works), but I think that things are easier to understand when sticking to the rules.


> -----Original Message----- > From: owner-statalist@hsphsun2.harvard.edu [mailto:owner- > statalist@hsphsun2.harvard.edu] On Behalf Of Scott Cunningham > Sent: Monday, March 13, 2006 8:31 AM > To: statalist@hsphsun2.harvard.edu > Subject: st: legend on graph help > > I am having trouble adjusting the legend of a simple table. It's a > two-way graph and I have one variable (SexRatio) which I'm plotting > separately for Blacks and Whites. The variable has no descriptive > labeling, so I wanted to change the legend by using the legend- > ordering command. Is there an obvious mistake here that someone can > immediately point out? Thanks. -sc > > . twoway (order (1 "white sex ratio", 2 "black sex ratio")) (line > SexRatio age if race==1, lcolor(black) lpattern(dash)) (line SexRatio > age if race==2, lcolor(black) lpattern(solid)), ytitle(Ratio of Males > to Females) yscale(range(.65 1.1)) xtitle(Age Cohort) xscale(range(0 > 30)) title(Cohort-Specific U.S. Sex Ratios) caption(All ages are 5- > year cohorts)


Svend Juul Institut for Folkesundhed, Afdeling for Epidemiologi (Institute of Public Health, Department of Epidemiology) Vennelyst Boulevard 6 DK-8000 Aarhus C, Denmark Phone: +45 8942 6090 Home: +45 8693 7796 Email: sj@soci.au.dk __________________________________________

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