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

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

Subject |
st: RE: question |

Date |
Thu, 3 Nov 2005 11:38:42 -0000 |

First, note that the title "question" is not informative. You have two questions. On the second, there is an FAQ FAQ . . . . . . . . . . . . . . . . . . . . . . . Replacing missing values 2/03 How can I replace missing values with previous or following nonmissing values? http://www.stata.com/support/faqs/data/missing.html . search missing points to this. On the first, I am no survival expert, but absent a view of all your data your question looks very difficult to answer. But you can at a minimum compare the results on non-missing data and on data including imputations to see what difference it makes. Nick n.j.cox@durham.ac.uk Scott Cunningham > I am estimating a hazard, but I am missing data for certain time- > variant covariates when t is very small. Seeing data will help me > explain this. > > +--------------------------------+ > | sr _st _d _t _t0 | > |--------------------------------| > 1. | . 1 0 1 0 | > 2. | . 1 0 2 1 | > 3. | . 1 0 3 2 | > 4. | . 1 0 4 3 | > 5. | . 1 0 5 4 | > |--------------------------------| > 6. | . 1 0 6 5 | > 7. | . 1 0 7 6 | > 8. | . 1 0 8 7 | > 9. | . 1 0 9 8 | > 10. | .9738716 1 0 10 9 | > |--------------------------------| > 11. | 1.081043 1 0 11 10 | > 12. | 1.21261 1 0 12 11 | > 13. | 1.125889 1 1 13 12 | > 14. | . 1 0 1 0 | > 15. | . 1 0 2 1 | > |--------------------------------| > 16. | . 1 0 3 2 | > 17. | . 1 0 4 3 | > 18. | . 1 0 5 4 | > 19. | . 1 0 6 5 | > 20. | . 1 0 7 6 | > |--------------------------------| > 21. | . 1 0 8 7 | > 22. | . 1 0 9 8 | > 23. | .9738716 1 0 10 9 | > 24. | 1.081043 1 0 11 10 | > 25. | 1.21261 1 0 12 11 | > |--------------------------------| > 26. | 1.125889 1 0 13 12 | > 27. | 1.080463 1 0 14 13 | > 28. | .9527455 1 1 15 14 | > > > Notice that for all values of t=0 to t=9, I am missing data for sr. > My first question is when I -streg-, what effect does this > have on my > estimation? None of my respondents complete their respective spells > prior to t=10. Secondly, assume I wanted to fill in those missing > values with the same value as t=10. How would I do this? * * 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/

**Follow-Ups**:**Re: st: RE: question***From:*Scott Cunningham <scunning@gmail.com>

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