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From |
sdriver@stata.com (Shannon Driver, StataCorp) |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Tabulating "missing" values |

Date |
Wed, 09 Apr 2003 15:50:51 -0500 |

Michael Oakes <oakes@epi.umn.edu> wrote: > Hoping this isn't too obvious, but I cannot figure out how to fill-in rows > for response values that do not appear in my data but do exist > hypothetically. > Imagine a variable, call it q5, that has possible responses 1, 2, 3, and 4; > let it be a simple Likert scale for example. The trouble is if survey > respondents only endorse/check values of 3 or 4, then my table will look > like this > . tab q5, nolab > | > q5 | > | Freq. Percent Cum. > ------------+----------------------------------- > 3 | 14 24.14 24.14 > 4 | 44 75.86 100.00 > ------------+----------------------------------- > Total | 58 100.00 > But what I want is (something like) this, which I made the "hard-way" via > cut/paste > q5 | > | Freq. Percent Cum. > ------------+----------------------------------- > 1 | 0 0.0 0.0 > 2 | 0 0.0 0.0 > 3 | 14 24.14 24.14 > 4 | 44 75.86 100.00 > ------------+----------------------------------- > Total | 58 100.00 > In this example the hypothetical values of 1 and 2 are represented, which is > nice if I want to apply value labels and such for presentation. > I've looked at -tabcond- and a few other adaptations but cannot find what I > want -- I do not seem to understand -tabcond- if that would do the trick. > Solutions? Though this may not be the most elegant code, here is one way to get the results that I believe you want. I'm sure it could be expanded to allow more statistics and options. program tabrange version 8.0 syntax varname, range(numlist) foreach i in `range' { local rangelist "`rangelist' `i'," } local rangelist = substr("`rangelist'",1,length("`rangelist'")-1) tempvar freq gen `freq' = 1 qui count if inlist(`varlist',`rangelist') if r(N) != 0 { preserve collapse (sum) `freq' if inlist(`varlist',`rangelist'), /// by(`varlist') gen Freq = `freq' foreach i in `range' { qui count if `varlist' == `i' if r(N) == 0 { local obs = _N + 1 qui { set obs `obs' replace `varlist' = `i' in l replace Freq = 0 in l } } } sort `varlist' qui summ Freq gen Percent = Freq/r(sum) * 100 gen Cum = sum(Percent) format %5.2f Percent Cum list `varlist' Freq Percent Cum, sum(Freq Percent) /// labvar(`varlist') noobs restore } else { di as txt "No observations for " as res "`varlist'" /// as txt " in given range." } end Here are the results you get: . tabrange q5, range(1/4) +-------------------------------+ | q5 Freq Percent Cum | |-------------------------------| | 1 0 0.00 0.00 | | 2 0 0.00 0.00 | | 3 14 24.14 24.14 | | 4 44 75.86 100.00 | |-------------------------------| | Sum 58 100.00 | +-------------------------------+ . tabrange q5, range(1 3 4 8) +-------------------------------+ | q5 Freq Percent Cum | |-------------------------------| | 1 0 0.00 0.00 | | 3 14 24.14 24.14 | | 4 44 75.86 100.00 | | 8 0 0.00 100.00 | |-------------------------------| | Sum 58 100.00 | +-------------------------------+ . tabrange q5, range(14) No observations for q5 in given range. --Shannon Driver sdriver@stata.com * * 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: Tabulating "missing" values***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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