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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: Re: Bar labels in stacked bar chart |

Date |
Mon, 12 Apr 2004 18:17:20 +0100 |

Yes, you can do this, but not on the fly, so far as I am aware. The re-ordering you achieve with -graph bar- can be achieved (only?) by generating indicator variables and then supplying them in the desired order. The analogous procedure needed for -catplot- is to provide a variable giving the desired sort order, say by . recode rep78 3=1 4=2 5=3 1=4 2=5, gen(Rep78) (69 differences between rep78 and Rep78) Then you need something like . catplot bar rep78 foreign, percent(foreign) asyvars stack oversubopts(sort(Rep78)) legend(order(3 4 5 1 2)) -oversubopts()- is an undocumented option. Also, make sure that you have the latest public domain -catplot-, 1.1.2. To put this in context, let me refer you to the original Statalist posting (recombine this URL) http://www.hsph.harvard.edu/cgi-bin/lwgate/STATALIST/ archives/statalist.0302/date/article-604.html on 18 February 2003. Here it is, in part: ================= Thanks to Kit Baum, a new package -catplot- has been posted on SSC. This is for plots of categorical data in Stata 8, specifically for bar or dot charts of the same showing frequencies, or fractions, or percents. (For Stata 7 or earlier there are other user-written programs available in the same territory, such as -fbar-, -tabhbar-, -vbar-.) Those who have looked at Stata 8's new graphics may well ask: Surely all that is very well done in Stata 8, with -graph bar-, -graph hbar- and -graph dot- offering a great range of possibilities? The answer is "Yes indeed", and that is what I am building on, the aim being to add a convenience command in one particular area. I work a lot with students and others who want bar charts of categorical data, for example, of counts of categories from one-way, two-way or even three-way tables from questionnaires and other survey data. In addition, many of these users want to tell me for some reason that it's very easy in Excel, so I really want to be able to say to them that it's also very easy in Stata. How does Stata size up on this task? 1. -histogram- is optimised for histograms, naturally. It can be used for this purpose by invoking options like , discrete xla(, valuelabel ang(45)) gap(50) for a one-way table or , discrete xla(, valuelabel ang(45)) gap(50) by(myvar, rows(1)) for a two-way table. Typing this -- or issuing the equivalent through a dialog -- is a little more complicated than some Stata beginners might expect for this task. In any case, some problems then frequently arise: a. it doesn't take much for value labels to become unreadable or to require what I call giraffe graphics, in which the graphic necessitates a great deal of neck movement. (That's why I have "ang(45)" in the examples above.) b. The number of cells you can show easily and effectively appears to be ~20, given that you will want value labels shown to indicate the categories. Any long value labels make this problem worse. c. Representing a 3-way table seems impossible, except by producing and then combining separate histograms. 2. -graph hbar- etc. is good _if_ the frequencies come predefined as a variable, because then you can just sum the frequencies. But if you want Stata to do the counting for you, this seems to require you to set up something to count. In particular, . graph hbar (count) rep78 doesn't give you the frequencies of the categories of -rep78-. Roughly, we want -graph- here to -contract-, not -collapse-. The way to do it is to calculate something in advance, as in . gen freq = 1 . graph hbar (count) freq, over(rep78) but arguably we shouldn't have to do that. And as for percents, catching missings, and working with -if- and -in-: it really needs a program. ======================== That is, -catplot- started out as the simplest program I could devise for bar charts of frequencies of categorical data -- given also that people do want two or more variables, percent calculations, etc., etc. Since birth, -catplot- has accumulated extra features both because users reasonably suggested them and because I found myself wanting them. This creates a small worry for the author, as the original intent was to keep it very simple. So -oversubopts()- was kept undocumented partly as an experiment to see how often it is needed, although some smart users looked at the code and discovered that it was there. Nick n.j.cox@durham.ac.uk > -----Original Message----- > From: owner-statalist@hsphsun2.harvard.edu > [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Friedrich > Huebler > Sent: 12 April 2004 05:31 > To: statalist@hsphsun2.harvard.edu > Subject: st: Re: Bar labels in stacked bar chart > > > Nick, > > Thank you, -catplot- is easier to use than -graph bar- because > several steps can be skipped. Another advantage is that -catplot- > works with numeric values and strings. > > However, with -graph bar yvars, over(varname) stack- it is possible > to stack the bars in a specific order by varying the order in which > the yvars are listed. > > . sysuse auto > . tab rep78, gen(rep) > . graph bar rep3 rep4 rep5 rep1 rep2, over(foreign) stack percent > > Can the same be accomplished with -catplot-? > > Thank you. > > Friedrich Huebler > > --- Nick Cox <n.j.cox@durham.ac.uk> wrote: > > Another way to do it is (in total) > > > > . catplot bar rep78 for , percent(for) asyvars stack > > blabel(bar, pos(center) format(%3.2f)) > > > > where I've added a format control. Here -catplot- can be > > installed from SSC. > > __________________________________ > Do you Yahoo!? > Yahoo! Tax Center - File online by April 15th > http://taxes.yahoo.com/filing.html > * > * For searches and help try: > * http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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