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From |
Howard Lempel <HLempel@brookings.edu> |

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

Subject |
st: RE: Re: percent of time a |

Date |
Wed, 11 Feb 2009 09:01:00 -0500 |

It would have been helpful if I'd been more explicit. I have various income variables that are topcoded and censored at zero and would like to know how often that bites among many different subpopulations. The censoring means that p(X_i=0) is not zero. I guess it's also true that my variables are not strictly continuous in that they're rounded to the nearest integer. I ended up doing something like the following: Gen zero = . foreach var in `vars' { local rowcount = 1 foreach gend in `genders' { foreach yr in `yrs' { local colcount = 1 *Do other things . . . . . . *Find out how often my variable is zero replace zero = (`var'==0) sum zero [aw=wgt] if gender==`gend' & year==`yr', meanonly matrix `var'mat[`rowcount', `colcount'] = r(mean) local colcount = `colcount' + 1 *Do more other things . . . . . . } } } Nick's method using the _gwtmean function for -egen- also works, but since there's no -ereplace- function, it would have involved either -dropping- a variable in each iteration of the loop, or -egenerating- lots of variables. Howie Howie Lempel Research Assistant The Brookings Institution | Economic Studies 1775 Massachusetts Ave NW | Washington DC 20036 hlempel@brookings.edu | p: (202) 238-3576 -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Kit Baum Sent: Wednesday, February 11, 2009 7:06 AM To: statalist@hsphsun2.harvard.edu Subject: st: Re: percent of time a <> Easy: for a continuous variable the probability that X_i = x is zero. Kit Baum, Boston College Economics and DIW Berlin http://ideas.repec.org/e/pba1.html An Introduction to Modern Econometrics Using Stata: http://www.stata-press.com/books/imeus.html On Feb 11, 2009, at 02:33 , Howie wrote: > Is there a command that will give me the proportion of the time a > variable is equal to a certain value? The command must accept > weights. I'm looking for something like -tabcond-, from SSC, but > that returns proportions as well as counts. > > One option would be to -generate- a dummy equal to 1 when my > variable is equal to my value and zero otherwise and then to use - > svy: mean-, but I would prefer something that can be done in one > line (and without generating a new variable). My variable is > continuous, so I don't want to -svy: tab- the whole thing. * * 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/ * * 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/

**Follow-Ups**:**st: RE: RE: Re: percent of time a***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**References**:**st: Re: percent of time a***From:*Kit Baum <baum@bc.edu>

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