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From |
Antoine Terracol <Antoine.Terracol@univ-paris1.fr> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: AW: Area under a percentile point |

Date |
Tue, 03 Feb 2009 16:19:13 +0100 |

Just make sure to drop all observations with missing values of myvar before applying Jeph's trick Antoine zeynep elitaº wrote: > It looks like it'll work just fine > Thanks for your time > Zeynep Elitas > > 2009/2/3 Jeph Herrin <junk@spandrel.net>: >> What you want is a bit strange, but here is how I would do it: >> >> sort myvar >> keep if _n<0.75*_N >> >> >> hope this helps, >> Jeph >> >> >> >> zeynep elitaº wrote: >>> Thanks for help, but this does not solve my problem. As a simple >>> example, lets assume we have a data set containing five 6's and five >>> 7's. so the sample size is 10. Now if I wanted to keep the data values >>> below the 75 th percentile, I would roughly have 7 observations >>> remaining. However, following your suggestion I end up keeping all the >>> observations. >>> Thanks >>> Zeynep Elitas >>> >>> 2009/2/3 Martin Weiss <martin.weiss1@gmx.de>: >>>> <> >>>> >>>> Let`s keep those below the 75 percentile of generated normal deviates... >>>> >>>> ************* >>>> clear* >>>> set obs 1000 >>>> generate x=rnormal() >>>> _pctile x, p(75) >>>> keep if x<=r(r1) >>>> ************* >>>> >>>> >>>> >>>> HTH >>>> Martin >>>> >>>> -----Ursprüngliche Nachricht----- >>>> Von: owner-statalist@hsphsun2.harvard.edu >>>> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von zeynep >>>> elitas >>>> Gesendet: Dienstag, 3. Februar 2009 14:28 >>>> An: statalist@hsphsun2.harvard.edu >>>> Betreff: st: Area under a percentile point >>>> >>>> I have a simple question which I do not have the answer for. Is there >>>> a way to tell Stata to keep the data under a certain percentile point >>>> and drop the rest? This is important since in my data a percentile >>>> point has often the same value as the ones below and over it. >>>> >>>> Thanks >>>> Zeynep Elitaº >>>> >>>> * >>>> * 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/ >>>> >>> * >>> * 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/ >> > > * > * 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/ > -- Ce message a ete verifie par MailScanner pour des virus ou des polluriels et rien de suspect n'a ete trouve. * * 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**:**RE: st: AW: Area under a percentile point***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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