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

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

Subject |
st: RE: possible to combine nmissing with tabstat? |

Date |
Mon, 14 Jun 2004 15:32:36 +0100 |

-nmissing- is a user-written command, last published in Stata Journal 3(4) 2003, so far as I can see. -tabstat- is an official Stata command. What you tried cannot be expected to work. The -s()- option of -tabstat- just accepts items from a menu indicating statistics to be calculated within -tabstat-. What you tried would only work in these circumstances: that if -tabstat- didn't recognise what you asked for, it then would try to find a command with the same name and use its results in tabulation. I see that this idea makes sense from your point of view, but it is essentially impossible to program without knowing what kinds of results would be returned by the program called, and arguably it is bad design in any case. However, what you want would be possible to program in a different way, if StataCorp were to extend the set of statistics provided to include the number of missing values. That would, however, require some restructuring of -tabstat- and arguably it is, again, bad design in any case, the main point being that -tabstat- has a clear focus as a wrapper for -summarize-. Loosely similar comments apply to -tabulate- and -table-. A cruder alternative is to cut and paste output from -nmissing- to go alongside outpot from -tabstat-. Clearly that is not a very attractive solution. A better alternative is to learn to use -tabdisp- to get what you want. In your example, the code might look like egen n = sum(1), by(DURSTAY DETMETH) egen nmissing, sum(mi(WEEKDELAY)), by(DURSTAY DETMETH) egen mean = mean(WEEKDELAY), by(DURSTAY DETMETH) tabdisp DURSTAY DETMETH , c(mean n nmissing) There is some discussion of related problems in Problems with tables, Part I. Stata Journal 3(3):309--324 (2003) Nick n.j.cox@durham.ac.uk A.M. Vos > I just found 'nmissing' and I hoped it was possible to use that in > combination with > tabstat, but it appeared not to. For instance, my syntax reads: > > by DURSTAY DETMETH: tabstat WEEKDELAY, s(mean n) > > and I would like to say: > > by DURSTAY DETMETH: tabstat WEEKDELAY, s( mean n nmissing) > that is, for each combination of durstay and detmeth > obtaining the mean > delay in > weeks, the number of observations on which the mean was > calculated, and > the number > of observations with a missing value on weekdelay. > > it would also be nice if 'nmissing' could be used in combination with > table and tabulate. > would this be possible? * * 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/

**Follow-Ups**:**Re: st: RE: possible to combine nmissing with tabstat?***From:*"A.M. Vos" <a.vos@erasmusmc.nl>

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