Rob Bossarte
> I am trying to generate a bar graph with the cumulative
> percent of a variable along the y-axis instead of either
> simple counts or means. I can't seem to find anything in
> the STATA graphics guide.
Lee Sieswerda
> Try typing:
> findit cumulative frequency
>
> There's a FAQ by Nick Cox on tabulating cumulative frequency (or
> percent/proportion) as well as a couple of user-written
> commands that'll do
> it directly (-distplot- by Nick Cox and -ghistcum- by Baum and Cox).
-distplot- gives a continuous curve, not a bar graph.
If you really do want a bar graph, you can knit your own
in a few lines:
. u auto
. bysort rep78 : gen freq = _N if _n == 1
. replace freq = sum(freq)
!!! output edited here
. l freq
freq
1. 2
2. 2
3. 10
4. 10
9. 10
10. 10
11. 40
12. 40
38. 40
39. 40
40. 40
41. 58
42. 58
56. 58
57. 58
58. 58
59. 69
60. 69
68. 69
69. 69
70. 74
73. 74
74. 74
. label var freq "cumulative frequency"
. gra freq , mean bar by(rep78) b2(Repair record 1978) yla
In other words, calculate the cumulative
frequencies yourself and show them directly
as a bar chart.
The trickery lies in making sure that the
cumulative frequencies are the same within
category, so that their "mean" yields what
you desire. The "if _n == 1" is crucial here.
("* (_n == 1)" would work as well.)
Note that by default missings are ignored. Thus
the observations for which rep78 == . are not
represented in the bar graph.
Nick
[email protected]
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
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* http://www.ats.ucla.edu/stat/stata/
