Hello, I would like to draw a histogram with two vertical lines showing
upper and lower estimates of a statistic for two (or more) groups using
the graph command of Stata 7.0.
This is a snippet of the
example dataset:
grp������
stat�����������
lower_es�����������
upper_es
1���������
91�����������
43.45387�����������
60.79625
1���������
60�����������
43.45387�����������
60.79625
1���������
87�����������
43.45387�����������
60.79625
1���������
52�����������
43.45387�����������
60.79625
[..removed..]
2���������
100�����������
79.70421�����������
124.2349
2���������
60�����������
79.70421�����������
124.2349
2���������
77�����������
79.70421�����������
124.2349
2���������
125�����������
79.70421�����������
124.2349
[..removed..]
I have already read the existing
post at http://www.stata.com/statalist/archive/2003-08/msg00282.html about
a similar topic.
Nevertheless, I can’t figure out how to
draw upper and lower estimates with ‘xline()’ option when the
‘graph’ command is combined with the ‘by’ option
like that:
��� graph stat, by(grp)
xline(`=lower_es[_n]' `= upper_es[_n]')
In fact, the graph
command always draw vertical lines in the same position in all the
histograms combined with the by option (I suppose it always draws
lower_es[1] and upper_es[1]).
I considered the possibility to
create histograms using the ‘by’ clausole like that:
��� by grp: graph stat, xline(`=lb[_n]' `=ub[_n]') xlab(0
20 to 140)
but I obtained the the same previous result.
Anyone can suggest me a solution ?
Thanks
in advance,
Achille M. Luongo
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