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

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

Subject |
st: AW: Problem looping over spells for an individual |

Date |
Wed, 25 Feb 2009 17:39:42 +0100 |

<> Are you sure the line ************* if `touse' { ************* does what you want it to? -set trace on- or indeed use the recently announced -ssc d tr- and report what happens... HTH Martin -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Ilona Carneiro Gesendet: Mittwoch, 25. Februar 2009 17:24 An: statalist@hsphsun2.harvard.edu Betreff: st: Problem looping over spells for an individual Hello all I am trying to write a programme that will run a command sequentially for observations of an individual. For each individual I have multiple spells and multiple failures. However, the twist is that I also need to exclude a period of time at risk after each treatment (prophylaxis) and after each failure (to prevent double-counting of failures that may actually be the same episode). I managed to do this without any problem for the treatment, but if an episode is disqualified (by a prior treatment or episode) I don't want it to disqualify a subsequent episode. Therefore I need to run the code sequentially for each spell of an individual, but using the marksample touse code to run it "by" individual doesn't seem to be working - the "forvalues" seems to always interpret _N as the last observation in the whole dataset, not the last observation for each individual. I have the following code: program define byid, byable(recall, noheader) marksample touse sort `id' `start' if `touse' { forvalues i = 1(1)`=_N' { replace lagend = (`end' + `lag') if ((`tx' > 0 & `tx' < .) | (`case' > 0 & `case' < .)) drop if lagend[`i'-1]>`end' & `id'[`i'-1]==`id' } } end gen lagend=. qui by id: byid but I get the error: 2nd by group not found r(111); And the programme isn't doing what I need it to. Any ideas? Ilona * * 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: AW: Problem looping over spells for an individual***From:*Ilona Carneiro <ilonac@orange.es>

**References**:**st: Problem looping over spells for an individual***From:*Ilona Carneiro <ilonac@orange.es>

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