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

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: AW: Merging database |

Date |
Wed, 29 Apr 2009 11:54:21 -0500 |

something like: joinby V using "filename", unmatched(both) _merge(label) ~Eric __ Eric A. Booth Public Policy Research Institute Texas A&M University ebooth@ppri.tamu.edu Office: +979.845.6754 Fax: +979.845.0249 http://ppri.tamu.edu On Apr 29, 2009, at 11:41 AM, Eric A. Booth wrote:

To add to Jochen's comment:If you were hoping to have a new 'ID' variable that keeps theinformation from all the ID variables V1, V2, and V3, you couldcreate a string variable...here are some examples:****************** clear input V1 V2 V3 1 . 1 2 . 2 3 3 3 4 4 . . 5 5 6 . 6 end // foreach x in V* { recode `x' (.=99) // <-- So that -regexr- isn't tripped up later tostring `x', replace } gen str10 v_combined = V1+"_"+V2+"_"+V3 gen v_combined2 = regexr(v_combined, "99", "x") sencode v_combined2, gene(uniqueID) gsort(+v_combined2) label(id) list ****************** ~Eric __ Eric A. Booth Public Policy Research Institute Texas A&M University ebooth@ppri.tamu.edu Office: +979.845.6754 Fax: +979.845.0249 http://ppri.tamu.edu On Apr 29, 2009, at 11:36 AM, Jochen Späth wrote:Hello Sergio,I'm not quite sure of what your problem is, maybe it would help ifyou were a little more precise.Below, I assumed that the example you gave is AFTER your three datasets have been merged, with v1 coming from the first, v2 from thesecond and v3 from the third and with v1, v2 and v3 denoting allthe same ID. If this is the case you could-replace v1 = v2 if v1 == . & v2 != .- -replace v1 = v3 if v1 == . & v2 ==. & v3 != .--count if v1 == .- /* should return 0, otherwise there areobservations in your data that are not uniquely determined byeither of your three ID variables.*/-drop v2 v3- /* of course, only if you got all IDs caught in v1 */ HTH, Jochen -----Ursprüngliche Nachricht-----Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von "SERGIO M. AFCHA CHÁVEZ"Gesendet: Mittwoch, 29. April 2009 17:55 An: statalist@hsphsun2.harvard.edu Betreff: st: Merging database Dear Statlisters, I have a little problem merging a data base. I have variables for 3 years showing an ID: V1 V2 V3 1 . 1 2 . 2 3 3 3 4 4 . . 5 5 6 . 6I need only one ID variable. How can I obtain one column with alltheID numbers? Thanks in advance for your help. Sergio * * 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/

**References**:**st: Merging database***From:*"SERGIO M. AFCHA CHÁVEZ" <s.afcha@ub.edu>

**st: AW: Merging database***From:*Jochen Späth <jochen.spaeth@iaw.edu>

**Re: st: AW: Merging database***From:*"Eric A. Booth" <ebooth@ppri.tamu.edu>

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