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Re: st: RE: graph command: xline() with by() option
How about something like this? you would need to choose the value of
-top- to be the right height, which might require some experimentation.
And you might want to add options to the -pcspike- plots to set the
line color, etc.
. gen zero = 0
. gen top = 0.05
. graph twoway histogram stat || pcspike zero lower_es top lower_es ||
pcspike zero upper_es top upper_es , by(grp)
- Nick Winter
Nick Cox wrote:
Unfortunately, it is possible to say why this doesn't work. When Stata sees any references to local macros in commands, it substitutes them immediately with their contents and then tries to execute the command. That applies too to references of form
`= <some calculation>'. In short, that is done once only. Thus there is no way that what you want will be done separately according to the distinct values of a variable specified in a -by()- option.
Nor can I think of a neat way to do this in Stata 7, or even Stata 10. I guess you need to produce individual graphs, and then combine them. -forval- or -foreach- would help.
Nick
[email protected]
Achille M. Luongo
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.
*
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--
--------------------------------------------------------------
Nicholas Winter 434.924.6994 t
Assistant Professor 434.924.3359 f
Department of Politics [email protected] e
University of Virginia faculty.virginia.edu/nwinter w
PO Box 400787, 100 Cabell Hall
Charlottesville, VA 22904
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/