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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

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

Subject |
AW: st: Problem with xi (Stata 11) |

Date |
Wed, 2 Jun 2010 15:45:13 +0200 |

<> This sounds like a problem that you should take up with Stata tech support, as nobody else has been able to reproduce it. HTH Martin -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Walter Garcia-Fontes Gesendet: Mittwoch, 2. Juni 2010 15:35 An: statalist@hsphsun2.harvard.edu Betreff: Re: st: Problem with xi (Stata 11) It seems a problem that I'm only able to reproduce in my machine, from a fresh started stata and entering the following commands: webuse set http://puna.upf.edu webuse data/data xi i.COUNTRY ta COUNTRY _ICOUNTRY_56, nol Country | code | COUNTRY==56 3-digit | 0 1 | Total -----------+----------------------+---------- 40 | 4,927 0 | 4,927 56 | 265 8,592 | 8,857 203 | 5,932 0 | 5,932 208 | 4,532 0 | 4,532 233 | 4,865 0 | 4,865 246 | 4,714 0 | 4,714 250 | 4,716 0 | 4,716 276 | 4,891 0 | 4,891 300 | 4,873 0 | 4,873 348 | 4,490 0 | 4,490 372 | 4,444 141 | 4,585 380 | 21,773 0 | 21,773 -----------+----------------------+---------- Total | 70,422 8,733 | 79,155 I get this both in updated Stata 10 and Stata 11. My machine is a Dell Precision 690 running Ubuntu Gnu-Linux 10.04. I tried it also at a Sun server running Solaris and I can't reproduce under Stata 10 (no Stata 11 there yet). So it seems some combination of a particular machine precision and the xi command. tab COUNTRY, gen(_ICOUNTRY) works perfectly on the other hand. Walter * Martin Weiss [02/06/10 15:10]: > > <> > > > " Stata 11 users are encouraged officially to use factor variables" > > > Walter may have a point, though, if all he wants is to use -xi- as a > standalone command, to generate dummies for a categorical variable. -tab, > gen()- may be an alternative. > > > > HTH > Martin > > > -----Ursprüngliche Nachricht----- > Von: owner-statalist@hsphsun2.harvard.edu > [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Roger Newson > Gesendet: Mittwoch, 2. Juni 2010 15:01 > An: statalist@hsphsun2.harvard.edu > Betreff: Re: st: Problem with xi (Stata 11) > > I don't know what exactly is going on in your case. However, I do know > that Stata 11 users are encouraged officially to use factor variables > instead of -xi-, although -xi- should still work (and has done so for me > so far). > > Best wishes > > Roger > > > Roger B Newson BSc MSc DPhil > Lecturer in Medical Statistics > Respiratory Epidemiology and Public Health Group > National Heart and Lung Institute > Imperial College London > Royal Brompton Campus > Room 33, Emmanuel Kaye Building > 1B Manresa Road > London SW3 6LR > UNITED KINGDOM > Tel: +44 (0)20 7352 8121 ext 3381 > Fax: +44 (0)20 7351 8322 > Email: r.newson@imperial.ac.uk > Web page: http://www.imperial.ac.uk/nhli/r.newson/ > Departmental Web page: > http://www1.imperial.ac.uk/medicine/about/divisions/nhli/respiration/popgene > tics/reph/ > > Opinions expressed are those of the author, not of the institution. > > On 02/06/2010 13:47, Walter Garcia-Fontes wrote: > > I have a problem with the "xi" command in Stata 11 (completely updated > > as of today). I tried to create a dataset as simple as possible to > > reproduce the problem, which can be accessed from my server. In the > > dataset there is a single variable called COUNTRY with numeric codes > > for each country and labels identifying the country. > > > > There are 12 different values for COUNTRY (12 different countries) and > > 79155 observations with a variable number of observations for each > country. > > To reproduce: > > > > webuse set http://puna.upf.edu > > webuse data/data.dta > > xi i.COUNTRY > > > > Stata creates variables _ICOUNTRY_n as it should, where n are the > > different codes for the 12 countries, omitting the country with the > > smallest code. > > > > The problem is that some of the values of _ICOUNTRY are 0 when they > > shouldn't be, for instance I have cases where _ICOUNTRY_56 = 0 but > > COUNTRY = 56. This happens randomly for a few cases and I've looked at > > it from all angles but couldn't figure out what is going on. > > > > If I reduce the number of variables or the number of observations the > > problem disappears at some point, can't tell exactly when, so I'm > > providing the smallest example I could build. > > > > Walter > > > * > * 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/ -- Walter Garcia-Fontes mailto: walter.garcia@upf.edu - http://puna.upf.edu Departament d'Economia i Empresa - http://www.econ.upf.edu Universitat Pompeu Fabra Ramon Trias Fargas 25-27, 08005 Barcelona, Spain Tel. +34 93 542 2722 - Fax. +34 93 542 1746 * * 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/

**References**:**st: Problem with xi (Stata 11)***From:*Walter Garcia-Fontes <walter.garcia@upf.edu>

**Re: st: Problem with xi (Stata 11)***From:*Roger Newson <r.newson@imperial.ac.uk>

**AW: st: Problem with xi (Stata 11)***From:*"Martin Weiss" <martin.weiss1@gmx.de>

**Re: st: Problem with xi (Stata 11)***From:*Walter Garcia-Fontes <walter.garcia@upf.edu>

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