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From |
Nick Cox <njcoxstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Stacked bar graph with twoway__histogram_gen |

Date |
Wed, 7 Mar 2012 18:43:35 +0000 |

I wouldn't do this. You want to subdivide a histogram according to two categories. My recipe for such cases is 1. Lay down a histogram for everything. 2. Lay down a histogram for one category on top. Then the difference is just the histogram for the other category, stacked. Here is some example code: sysuse auto twoway histogram mpg , width(2) start(10) barw(1.98) freq bfcolor(red*0.6) blcolor(gs12) || histogram mpg if foreign , width(2) barw(1.98) start(10) freq blcolor(gs12) bfcolor(blue*0.6) legend(order(1 "Domestic" 2 "Foreign") col(1) ring(0) pos(1)) See also Cox, N.J. 2009. Stata tip 78: Going gray gracefully: Highlighting subsets and downplaying substrates The Stata Journal 9(3): 499-503 On Wed, Mar 7, 2012 at 6:28 PM, Stefano Lombardi <lombardi_stefano@fastwebnet.it> wrote: > I have a problem in plotting a stacked bar graph. I have read some > documentation on the Internet and I am really close to obtain what I need, > but still I cannot manage to solve one issue (I haven't found any similar > problem on the Statalist archive..) > > In practice, I have one duration variable in months (overall survival, "os") > which as usual can be either censored or uncensored (the failure dummy is > "status_os"; 1 = os is uncensored). I need to create a stacked bar graph > with different colors for censored and uncensored data (blue and red, > respectively). My code is the following: > > use "epd0", clear > twoway__histogram_gen os if status_os==0, gen(freq_1 x, replace) /// > freq start(0) width(5) > drop if missing(x) > keep freq_1 x > save f1, replace > > use "epd0", clear > twoway__histogram_gen os if status_os==1, gen(freq_2 x, replace) /// > freq start(0) width(5) > drop if missing(x) > keep freq_2 x os > > merge 1:1 x using f1 > mvencode freq_1 freq_2, mv(. = 0) > > egen freq = rowtotal(freq_1 freq_2) > > twoway /// > (bar freq_1 x, barw(5) bcolor(red)) /// > rbar freq_2 freq x, barw(5) bcolor(blue) /// > legend(order(1 "Uncensored" 2 "Censored")) /// > xtitle("`: var label os'") ytitle(Frequency) > > Everything looks perfect but for one thing. In one bin there is a blank gap > between the lower red bar (which counts for two observations) and the upper > blue bar (other two observations). > Actually -- also by checking the previously generated frequencies -- the > lower bar should correspond to three observations, hence the blank gap > should be red. > > Can you suggest any solution? It may be a coincidence, but that bin is the > only one where there should be plotted more uncensored (red) data than > censored (blue) ones. * * 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/

**References**:**st: Stacked bar graph with twoway__histogram_gen***From:*Stefano Lombardi <lombardi_stefano@fastwebnet.it>

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