Urn sampling, interval censoring and proportional hazard models
| Autor: | Lu Zheng, Marvin Zelen |
|---|---|
| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Statistical Modelling. 9:361-379 |
| ISSN: | 1477-0342 1471-082X |
| DOI: | 10.1177/1471082x0900900406 |
| Popis: | This paper proposes a new distribution-free statistical method for testing hypotheses about covariates for survival data having simultaneously right-, left- and interval-censored survival times. The new test is motivated by the analogue between urn sampling and the Cox’s proportional hazard models. Investigations of the significance levels and power as a function of the proportion of interval-censored observations and interval length show that the test performs well for most censoring situations encountered in practice. Simulation results also suggest that there is negligible loss of power in the practical situation in which the mean interval length for interval-censored observations is less than the mean survival time. This holds even with heavy interval censoring. Comparison with the widely used Mantel’s method for comparing two groups shows that the power of the new method appears to be superior. Furthermore, the test is relatively simple to carry out and generalizes to comparing k populations as well as the testing of general linear hypothesis for arbitrary covariates. |
| Databáze: | OpenAIRE |
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