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| From | Nick Cox <njcoxstata@gmail.com> |
| To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
| Subject | Re: st: RE: Graphing Histograms and Overlaying A Vertical Line |
| Date | Fri, 24 May 2013 19:05:21 +0100 |
This is a trick worth knowing, and I will give it a puff because Elan is being modest about it. -twoway function- draws functions that are y (variable on vertical axis) = whatever, and whatever can be a constant. But here the problem is to draw a function x (variable on horizontal axis) = whatever, and whatever is a constant. The option -horizontal- is what flips it around. It's documented, but like so much that is documented, it can easily be overlooked. Thanks for the nice example. Nick njcoxstata@gmail.com On 24 May 2013 18:48, Cohen, Elan <cohened@upmc.edu> wrote: > I see now. From http://www.stata-journal.com/sjpdf.html?articlenum=gr0014, the following should work: > > sysuse auto > twoway__histogram_gen mpg, percent gen(h x) > su h, meanonly > loc max = 1.1*r(max) > qui su mpg, d > loc mean = r(mean) > loc med = r(p50) > tw hist mpg, percent || function y=`mean', hor ra(0 `max') || function y=`med', hor ra(0 `max') > > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/