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From |
Eric Booth <ebooth@ppri.tamu.edu> |

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

Subject |
RE: st: Dropping observations and creating a balanced panel |

Date |
Wed, 28 Jul 2010 14:10:07 +0000 |

<> Yeah, it was a typo, I meant to type "firstyear" instead of "year" in that last line. Also, you could also use -fillin- (from SSC) to create balanced panels after dropping panels that are problematic (start after 2003 & with closure | chow). cap which fillin if _rc ssc install fillin, replace fillin oshpd_fac_no year ~ Eric ________________________________________ From: owner-statalist@hsphsun2.harvard.edu [owner-statalist@hsphsun2.harvard.edu] on behalf of Martin Weiss [martin.weiss1@gmx.de] Sent: Wednesday, July 28, 2010 8:48 AM To: statalist@hsphsun2.harvard.edu Subject: AW: st: Dropping observations and creating a balanced panel <> "I am off to try and figure out the duplicates or some similar command." You can find the problematic observations thus: ************* sysuse nlswork,clear bys idcode: gen int number=_N su number, mean cou if number!=r(max) ************* HTH Martin -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Matthew Krauchunas Gesendet: Mittwoch, 28. Juli 2010 15:27 An: statalist@hsphsun2.harvard.edu Betreff: Re: st: Dropping observations and creating a balanced panel Hi Eric, I had to tweak the code a little bit, but you got me 95% of the way there! drop if firstyear>2002 & !mi(year) instead of drop if year>2003 & !mi(year) My only problem now is that I would expect a balanced panel (i.e., one divisible by 6), but that is not the case as I have 3,971 observations remaining. Also, it will not let me xtset the data. Instead it gives me a "repeated time values within panel error." I am off to try and figure out the duplicates or some similar command. Thanks, Matt On Tue, Jul 27, 2010 at 9:53 PM, Eric Booth <ebooth@ppri.tamu.edu> wrote: > <> > > Note: I added facility 206010741 to your example data: > *********! > clear > inp double(oshpd_fac_no) year chow closure > 206010734 2002 0 0 > 206010734 2003 0 0 > 206010734 2004 0 0 > 206010734 2006 0 0 > 206010734 2006 1 0 > 206010734 2008 0 0 > 206010744 2002 0 0 > 206010744 2003 0 0 > 206010744 2004 0 0 > 206010744 2007 0 0 > 206010744 2008 0 0 > 206010747 2002 0 0 > 206010747 2003 0 0 > 206010747 2004 0 0 > 206010747 2006 0 0 > 206010747 2007 0 0 > 206010747 2008 0 0 > 206010741 2007 0 0 > 206010741 2004 0 0 > 206010741 2005 0 0 > 206010741 2006 0 0 > end > > ** 1. drop all the observations in each of the panels if there was a chow or closure** > bys oshpd_fac_no: egen any_chow = max(chow) > bys oshpd_fac_no: egen any_closure = max(closure) > drop if 1==any_closure | 1==any_chow > > **2. drop if I have all nursing homes that opened after 2003 ** > bys oshpd_fac_no: egen firstyear = min(year) > drop if year>2003 & !mi(year) > *********! > > ~ Eric > > __ > Eric A. Booth > Public Policy Research Institute > Texas A&M University > ebooth@ppri.tamu.edu > Office: +979.845.6754 > > > On Jul 27, 2010, at 4:52 PM, Matthew Krauchunas wrote: > >> Hello, >> >> I am studying nursing homes (2002-2004 & 2006-2008) and I have a two >> part problem that I need to solve in order to create a balanced panel. >> First, I have nursing homes that have closed or changed ownership >> (chow) during my study period. I need to drop all the observations >> in each of the panels (panel identifier is the oshpd_fac_no) if there >> was a chow or closure? Second, I have nursing homes that opened after >> 2003 and therefore I would not have all the observations for these >> panels. How can I identify and remove these panels as well? Does >> anyone have any ideas? >> >> >> oshpd_fac_no year chow closure >> 206010734 2002 0 0 >> 206010734 2003 0 0 >> 206010734 2004 0 0 >> 206010734 2006 0 0 >> 206010734 2006 1 0 >> 206010734 2008 0 0 >> 206010744 2002 0 0 >> 206010744 2003 0 0 >> 206010744 2004 0 0 >> 206010744 2007 0 0 >> 206010744 2008 0 0 >> 206010747 2002 0 0 >> 206010747 2003 0 0 >> 206010747 2004 0 0 >> 206010747 2006 0 0 >> 206010747 2007 0 0 >> 206010747 2008 0 0 >> >> Thank you, >> Matt >> * > > > > * > * 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/

**Follow-Ups**:**Re: st: Dropping observations and creating a balanced panel***From:*Matthew Krauchunas <krauchunasms@mymail.vcu.edu>

**References**:**st: Dropping observations and creating a balanced panel***From:*Matthew Krauchunas <krauchunasms@mymail.vcu.edu>

**Re: st: Dropping observations and creating a balanced panel***From:*Eric Booth <ebooth@ppri.tamu.edu>

**Re: st: Dropping observations and creating a balanced panel***From:*Matthew Krauchunas <krauchunasms@mymail.vcu.edu>

**AW: st: Dropping observations and creating a balanced panel***From:*"Martin Weiss" <martin.weiss1@gmx.de>

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