Guido Tiemann <[email protected]> writes:
> I know that there are "weighted markers" in a scatterplot (Stata 9);
> however "weights are ignored when the mlabel() option is specified"
> (Graphics Manual, p 293).
>
> Does anyone know another option so as to produce "weighted labels" in a
> scatterplot?
--- Derek Wagner, StataCorp answered:
> One way to get around the problem of using marker labels with weighted
> markers would be to create overlaid plots using the same values each time
> (one graph would be weighted while the other graph would show the labels).
>
> For the graph showing only the labels, you can hide the markers with the
> -msymbol(none)- option.
>
> Your resulting command might look like the following:
>
>. twoway (scatter y x, msymbol(none) mlabel(z)) (scatter y x [weight=w])
An alternative is to overlay different scatter plots with
labels in different fontsizes.
In the example below I want to change the fontisize
depending on displacement. I first create a variable that
groups displacement into 11 equally spaced groups. Than I
store the values into the local levels using the -levelsoff-
command. For each group I want to graph a scatter of price
versus mpg with its own fontsize for the labels, and overlay
these scatters graphs. I will store the entire command in
the local gr (so I can automatically build the command by
looping over the levels).
The first scatter is a bit different (it contains "twoway
scatter" instead of "scatter" and "legend(off)") so I create
that outside the loop. To make that work I need to prevent
the loop to include the first level, otherwise these would
be plotted twice. To remove the first level from the local
levels I use the command -gettoken-.
Two other things need attention: First, the local gr contains
a very long string. To ensure that the maximum string length
doesn't bite I took care not to include an equal sign when
declaring the local gr. Second to wrap the local command over
multiple lines I used the -#delimit ;- command since you
can't use /**/ to wrap lines inside a string since it will
just be considered as part of the string.
*------------------ begin example -----------------
sysuse auto, clear
sum displacement
local incr = (r(max)-r(min))/12
local min = r(min)
local max = 10000
egen grdispl = cut(displacement), at(`min'(`incr')`max')
qui levelsof grdispl, local(levels)
gettoken first levels: levels
local size = .5
#delimit ;
local gr "twoway scatter price mpg
if grdispl == `first',
mlabel(make) mlabpos(0) msymbol(i)
mlabsize(*`size') legend(off) " ;
foreach lev of local levels { ;
local size = `size' + .1 ;
local gr "`gr' || scatter price mpg
if grdispl == `lev',
mlabel(make) mlabpos(0) msymbol(i)
mlabsize(*`size') " ;
} ;
#delimit cr
`gr'
*------------------ end example ------------------
(For more on how to use examples I sent to the Statalist, see:
http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )
Hope this helps,
Maarten
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
