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A Cox Proportional Hazard Model with Time-Varying Coefficients Using Revised Survival Time to Investigate Stroke Risk Factors : 뇌졸중 위험요인 분석을 위하여 개선된 생존시간을 이용하는 시간변동계수를 포함한 Cox 비례위험모형

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Authors

장지영

Advisor
Myunghee Cho Paik
Major
자연과학대학 통계학과
Issue Date
2014-02
Publisher
서울대학교 대학원
Keywords
strokeNorthern Manhattan stroke studyCox proportional hazard modelsurvival timeproportional hazard assumptiontime-varying coefficient
Description
학위논문 (석사)-- 서울대학교 대학원 : 통계학과, 2014. 2. Myunghee Cho Paik.
Abstract
According to estimates by World Health Organization (WHO), globally, cardiovascular disease is the first leading cause of death. Among various cardiovascular diseases, the risk of stroke is constantly increasing even though the mortality rate for it is decreasing. Including representative studies, Framingham study and Northern Manhattan stroke study (NOMAS), many of studies relating to the risk factors of stroke have been performed. In this study, using the dataset obtained from NOMAS, the Cox proportional hazard model is used in order to investigate stroke risk factors. In particular, the NOMAS used follow-up time to onset of stroke, whereas, in this study, the age of having a stroke is treated as survival time for fitting the models. The proportional hazard assumption is evaluated through graphs, and some risk factors whose risk effects vary according to the variation of age are detected. The pattern of change and the significance of these risk effects are evaluated by constructing a Coxs model with time-varying coefficients. In addition to the study concerning occurrence of all types of strokes, the study concentrating only on the ischemic stroke occurrence is also performed and these two are compared.
Language
English
URI
https://hdl.handle.net/10371/131281
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College of Natural Sciences (자연과학대학)Dept. of Statistics (통계학과)Theses (Master's Degree_통계학과)
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