PRM82 Verification of Proportional Hazards Assumption in Cost-Effectiveness Analysis (CEA)
نویسندگان
چکیده
منابع مشابه
Testing the proportional hazards assumption in case-cohort analysis
BACKGROUND Case-cohort studies have become common in epidemiological studies of rare disease, with Cox regression models the principal method used in their analysis. However, no appropriate procedures to assess the assumption of proportional hazards of case-cohort Cox models have been proposed. METHODS We extended the correlation test based on Schoenfeld residuals, an approach used to evaluat...
متن کاملEssays on the Assumption of Proportional Hazards in Cox Regression
Persson, I. 2002. Essays on the Assumption of Proportional Hazards in Cox Regression. Acta Universitatis Upsaliensis. Comprehensive Summaries of Uppsala Dissertations from the Faculty of Social Sciences 110. 36 pp. Uppsala. ISBN 91-554-5208-6. This thesis consists of four papers about the assumption of proportional hazards for the Cox model in survival analysis. The first paper compares the haz...
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Cox (1972) proposed the partial likelihood technique to estimate the risk coefficients of proportional hazards regression model without specify the baseline hazards function. Once the risk coefficients β are estimated, we may interest in estimating the corresponding baseline survival function. Therefore, Breslow (1972) and Kalbfleisch & Prentice (1973) provided two different procedures as the b...
متن کاملThe cost of checking proportional hazards.
Confidence intervals (CIs) and the reported predictive ability of statistical models may be misleading if one ignores uncertainty in the model selection procedure. When analyzing time-to-event data using Cox regression, one typically checks the proportional hazards (PH) assumption and subsequently alters the model to address any violations. Such an examination and correction constitute a model ...
متن کاملGraphical methods for assessing violations of the proportional hazards assumption in Cox regression.
A major assumption of the Cox proportional hazards model is that the effect of a given covariate does not change over time. If this assumption is violated, the simple Cox model is invalid, and more sophisticated analyses are required. This paper describes eight graphical methods for detecting violations of the proportional hazards assumption and demonstrates each on three published datasets wit...
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ژورنال
عنوان ژورنال: Value in Health
سال: 2012
ISSN: 1098-3015
DOI: 10.1016/j.jval.2012.08.1545