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

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

Subject |
RE: st: RE: bar graph of multiple variables |

Date |
Mon, 7 Mar 2005 11:03:00 -0000 |

Richard Sherman asked: ---------------------------------- Here is what must be a simple graphing problem; I confess that I am still mostly baffled by the Stata 8 graphics syntax. I have seven variables, c1-c7, that take values 1, 2, or 3. I want a graph of the frequencies of these variables that looks something like this: freq | | | | * | * * | * * | * * * | * * * * * * | * * * * * * * * * |________________________________________ (... etc.) 1 2 3 1 2 3 1 2 3 (... etc.) c1 c2 c3 (... etc.) I have been slogging away with -graph bar- and have gotten no farther than the inelegant and unsatisfying method of generating three variables from each variable (measuring the count of each category) and using graph bar (count) all-of-these-variables or graph bar (count) three-at-a-time and then graph combine these-seven-graphs But surely there is a better way. Thanks in advance for any help. ------------------------------------------------------------------- Clive Nicholas suggested ... > use Nick Cox's -catplot- routine, downloadable via SSC. ... > > to do something like: > > > > . catplot bar continuousvar, over(discretevar) sort percent asyvars > > > > But even this doesn't quite do what Richard wants, which is > to bar-graph > > seven _individual_ variables which all have (presumably) > the same three > > categories _without_ having to specify an -over()- option. Scott Merryman then suggested > Ok, how about something like this: > > *Create data set: 7 variables with values {1, 2, 3} > clear > set obs 30 > qui { > forv i = 1/7 { > gen c`i' = 1 > replace c`i' = 2 if uniform() <.4 > replace c`i' = 3 if uniform() <.3 > } > } > > *Create frequency values > qui { > forv i = 1/7 { > tempfile file`i' > xcontract c`i', freq(freq) idnum(`i') saving(`file`i'') > } > } > > dsconcat `file1' `file2' `file3' `file4' `file5' `file6' `file7' > drop c* > egen id2 = fill(1 2 3 1 2 3) > > forv i = 1/7 { > local relabel `relabel' `i' C`i' > } > > graph bar freq, over(id2) over(idnum, relabel( `relabel')) > ytitle(Frequency) Taking the idea from Clive of using -catplot- and from Scott that a data restructure is needed, another way is along these lines. First we create an example dataset as did Scott clear set obs 30 qui forv i = 1/7 { gen c`i' = 1 replace c`i' = 2 if uniform() <.4 replace c`i' = 3 if uniform() <.3 } Then gen id = _n reshape long c , i(id) catplot bar c _j There is no need to get into file manipulations, as all can be done in place. Nick n.j.cox@durham.ac.uk * * 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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