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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

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

Subject |
st: RE: Generating time-varying covariates in a multiple spell data |

Date |
Tue, 8 Apr 2008 15:58:36 +0100 |

A spell includes at least one December if (12 * ceil(BEGIN/12)) <= END That's a Stata expression that will evaluate as 0 or 1. Nick n.j.cox@durham.ac.uk Pyy-Martikainen Marjo I have a data containing multiple spells per person. The spells are measured in months. The data is in the following form: PERSON BEGIN END EVENT DUR 1 ( 0 1 ] 1 1 1 ( 4 13 ] 1 9 2 (15 25 ] 0 10 where variables BEGIN and END are measured in calendar time (1 refers to Jan 1995, 2 to Feb 1995 and so on until 60, Dec 1999). I stset the data in the following way: stset end, failure(event) time0(begin) exit(time .) origin(time begin) which means I want to "set the clock to zero" at the start of each spell. Now I would like to include a dummy for December months 12, 24, 36 and 48. It is thus a time-varying variable getting value 1 for the December months and 0 for other months. A spell may include zero, one or many December months. I suppose I should use stsplit and do some kind of episode splitting, but could someone help me and give me advice how I should do it with my data? * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Generating time-varying covariates in a multiple spell data***From:*"Pyy-Martikainen Marjo" <Marjo.Pyy-Martikainen@stat.fi>

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