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st: RE: -graph bar, over()- question and bug report


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: -graph bar, over()- question and bug report
Date   Wed, 13 Aug 2003 13:39:11 +0100

Friedrich Huebler

> How can I emphasize some of the groups in a -graph bar, over()-
> graph? I have graphs similar to one produced with these commands:
>
> . sysuse uslifeexp
> . drop if year>1910
> . graph bar le_w le_b, over(year) stack
>
> Let's assume I want to emphasize the years 1902 to 1905. As far as I
> know, none of the following ideas can be implemented in Stata.
>
> - Draw the labels for 1902 to 1905 in a different color.
> This idea is
> my personal favorite but -relabel(# "text")- has no option for
> specifying the color of the text.
> - Add a horizontal line from 1902 to 1905 (horizontal y lines cross
> the entire graph).
> - Add two vertical lines, one to the left of 1902 and one to the
> right of 1905 (vertical lines cannot be added).
>
> I would appreciate any suggestions for adding emphasis to the years
> 1902 to 1905.
>
> Now to the bug report. I thought about creating a vertical line with
> the letters I or l but this leads to an error message.
>
> . graph bar le_w le_b, over(year) stack text(2 18 "I" 2 55 "I")
> invalid syntax
> r(198);
>
> The same error message appears when the letters i, j, or l are used.
> That resulting graph has only the bars without any labels. I did not
> test the entire alphabet but most other letters appear to
> work. I can
> create a vertical line with the character used to indicate "or" in
> Stata commands but I would rather not use the -text- option because
> the correct coordinates depend on things like legend position and
> size that are not fixed.

I confirm the last bug report. I get seven "invalid syntax" messages;
that's a touch of class for you.

In general terms, some of what Friedrich is seeing follows from a
division
mentioned several times on this list since the release of Stata 8.

-graph bar- is based on the idea of bars plotted on a categorical
axis, in contrast to -twoway bar-, which is based on bars plotted
on a numeric axis.

I was going to suggest moving to -twoway bar- as
a partial remedy, but Friedrich wants to -stack- bars,
and I would think that's going to be difficult with
-twoway bar- (I won't say impossible, just in case
it can be done).

However, that in turn raises the question of why you want to stack
these bars. I assert that stacking is permissible for additive
quantities, and I would say that life expectancy for
whites and blacks does not qualify. So are these just data to
illustrate the Stata graphics problem, or is this what
you want to do?

Nick
n.j.cox@durham.ac.uk

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