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From |
"Robert Bozick" <rbozick@smtp.aed.org> |

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

Subject |
st: desgin effects, weights, and cox proportional hazard models |

Date |
Mon, 31 Mar 2003 10:41:32 -0500 |

Hello everyone -- I am currently working on a project that requires the use of hazard/event history models. I am relatively new to estimating these models. The basic model I am estimating is the rate of college degree completion as a function of a set of covariates COMPLETION = a + bX I have two questions: 1) How do I adjust the estimates for the clustered-stratified nature of the sample? The data set I am using is a two stage stratified-cluster sample (i.e. the National Education Longitudinal Study for those of you who use NCES data sets). In the first stage, schools are randomly sampled with a probability proportional to a given strata (defined by socioeconomic status, urban v. suburban, etc.) In the second stage, students are sampled randomly within the schools. In typical logit models using this data, I use 'survey' commands to adjust for the strata and hierarchically clustered desigin of the sample using the code : svyset psu psu svyset strata stratum (*where psu = the primary sampling unit (the school) and stratum is the strata that the schools were proportionally sampled from)....then when I estimate a logit model, I use the command: svylogit y x1 x2 x3 That command estimates the model correcting for the sample design. I noticed there is no 'survey' command for cox proportional hazard models. How do I correct for the sample design (cluster and strata) when estimating a cox proportional hazard model? 2) How do you weight data when estimating a cox proportional hazard model? I tried the command: stcox x1 x2 x3 [pweight = weight] Stata gave me the response: weights not allowed Are you not allowed to weight data when estimating a cox proportional hazard model or is there some other procedure that I need to do to incorporate a probability weight when estimating this type of model? Thanks in advance for any help with these issues! * * 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: desgin effects, weights, and cox proportional hazard models***From:*"Stephen P. Jenkins" <stephenj@essex.ac.uk>

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