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From |
Rodrigo Briceño <rjbriceno@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Re: missing values |

Date |
Wed, 18 Nov 2009 09:44:06 -0600 |

Thanks guys. I tried with the nmissing and mvpatterns, but certainly these do not fulfill my objective. I will test the commands recommended by Kit. One additional comment: I saw that there is no possibility of running xtreg together with stepwise. In these cases how can I avoid to do the tests manually to keep-drop variables? Thanks for your help. 2009/11/18 Kit Baum <baum@bc.edu>: > <> > I'm not sure -nmissing- is the answer here, as this involves listwise deletion: any observation with a value missing in any variable in the regression will be dropped. Something like this will test for that: > > sysuse auto,clear > replace turn = . if foreign & mod(_n,2) > replace weight = . if !foreign & !mod(_n,2) > nmissing price rep78 turn weight > > g ts1 = rep78+turn > g ts2 = rep78+weight > g ts3 = turn+weight > g ts4 = rep78+turn+weight > g ts5 = length+displacement+gear_ratio > su ts* > > The N reported by summarize is the number of cases that would enter the regression, given these regressors. > > On Nov 18, 2009, at 2:33 AM, statalist-digest wrote: > >> I'm using windows XP and stata 9.2. I'm running some econometric >> models and when I got the output I can see the number of observations >> that were used in the estimation. >> Since my database has several missing values for almost all variables >> I would like to know if there is some command-function that allow me >> to see which combination of variables will produce the regression with >> the highest avaialble number of non-missing observations. > > > Kit Baum | Boston College Economics & DIW Berlin | http://ideas.repec.org/e/pba1.html > An Introduction to Stata Programming | http://www.stata-press.com/books/isp.html > An Introduction to Modern Econometrics Using Stata | http://www.stata-press.com/books/imeus.html > > > * > * 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/ > -- Rodrigo Briceño Economist +506 22-91-12-00 ext. 113 Office +506 22-32-08-30 Fax rjbriceno@gmail.com MSN: jbric98@hotmail.com SKYPE: rbriceno1087 * * 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/

**References**:**st: Re: missing values***From:*Kit Baum <baum@bc.edu>

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