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

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

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

Date |
Sun, 12 Apr 2009 09:37:56 +1200 |

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/

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

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

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