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From |
"Mark Marshall" <mrmarsh@woosh.co.nz> |

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

Subject |
RE: Corrected repost: Two general questions about xt commmands and re / fe |

Date |
Sun, 12 Apr 2009 10:22:56 +1200 |

Thanks for the advice on Q1. I do stset for patient-level data, but most quality assurance data in medical practice is reported at unit-level. Panel data approaches are useful for analysing such data, offsetting by a variety of measures to account for unit-level casemix... Any thoughts on Q2? MM -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Martin Weiss Sent: Sunday, 12 April 2009 9:52 a.m. To: statalist@hsphsun2.harvard.edu Subject: Re: Corrected repost: Two general questions about xt commmands and re / fe <> BTW, just out of curiosity: Your problem sounds very much like a survival analysis issue. Have you considered -stset-ting? HTH Martin _______________________ ----- Original Message ----- From: "Mark Marshall" <mrmarsh@woosh.co.nz> To: <statalist@hsphsun2.harvard.edu> Sent: Saturday, April 11, 2009 11:37 PM Subject: Corrected repost: Two general questions about xt commmands and re / fe > Hi > > I am using Stata 9.2 on windows. > > I am fitting an xtpoisson model to unbalanced panel data (n counts of > death > over T months), with a grouping variable called unit that signifies the > ICU > where the data come from. E.g > > obs_rrt T unit > 0 5 4 > 3 6 4 > 2 7 4 > 4 8 4 > 3 9 4 > 1 10 4 > 3 2 3 > 1 3 3 > 1 4 3 > 1 5 3 > 0 6 3 > 1 7 3 > > Question 1. > > When I specify > > tis T > > my understanding is that this does not explicitly model T in the model (I > want to model the death rate in relationship to time, amongst other > things), > and I would have to specify T in the command line to do this. Is this > correct? > > Question 2. > > I would like to specify T and some other exposure covariates as fixed > effects, and unit as a random effect in the model. If I specify all of > these > as independent variables in the command line, and then use the re option, > how can I tell which is modelled as fixed, and which is modelled as > random? > > Thanks, > > Mark Marshall > > > > > > > > > > * > * 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**:**Corrected repost: Two general questions about xt commmands and re / fe***From:*"Mark Marshall" <mrmarsh@woosh.co.nz>

**Re: Corrected repost: Two general questions about xt commmands and re / fe***From:*"Martin Weiss" <martin.weiss1@gmx.de>

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