Introduction to Stata 8 - (GRIPS

graph bar
Prevalence (per cent)
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8
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4
2
0
16-24 25-44 45-66 67-79 80+
Age
Males
Females
/ / c:\dokumenter\...\gph.diabetes prevalence.do
clear
input str5 age m f
16-24 .9 .2
25-44 .8 .8
45-66 3.8 2.9
67-79 8.2 5.4
80+ 9.1 7.2
end
set
scheme lean2
graph bar m f ///
, ///
over(age) ///
b1title("Age") ///
ytitle("Prevalence (per cent)") ///
legend( label(1 "Males") label(2 "Females") ) ///
xsize(4) ysize(2.3) scale(1.4)
For some reason the xtitle() option is not valid for bar graphs. To generate an x-axis title
you may, however, use b1title() instead.
Bar fill colours are assigned automatically according to the scheme. This option would
generate a very dark fill for females:
...
bar(2 , bfcolor(gs3))
In bar graphs the x-axis is categorical, the y-axis continuous. In the example variables m and
f defined the heights of the bars, but actually graph bar used the default mean function,
as if the command were (with one observation per bar the result is the same):
graph bar (mean) m f , over(age)
With the auto data you could generate bars for the number of domestic and foreign cars by:
graph bar (count) mpg , over(foreign)
Actually what is counted is the number of non-missing values of mpg.
Bar graphs are documented in [G] graph bar and [G] graph twoway bar.
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