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[생존분석] 생존분석 PART3

저작시기 2005.07 |등록일 2005.07.04 한글파일한컴오피스 (hwp) | 11페이지 | 가격 2,300원

목차

1 Nonparametric Method

2 Comparison of two exponential distribution.

3. Accerlated Faliure Time

본문내용

Tarone - Ware class of tests.
; a family of nonparametric tests for sample with censoring.
1) Comparison of two groups
two treatment groups : 1 and 2.
Group 1 has N subjects : survival time {(t , d )} j=1,2,...,n
Group 2 has N subjects : survival time {(t , d )} j=1,2,...,n
Data for the combined sample.
d ; # of failure j th
m ; # of censoring j th
n ; # of risk set j th
Equal survival function implies independence of sample and status in 2x2 table.
( 즉 , 생존기간이 같다 = 생존패턴이 같다 = 2x2 테이블에서 행과 열이 서로 독립.
ex) smoking , cancer 간에 서로독립 ⇒ 서로영향을 미치지 않는다. )
Q : Constant Weight to the difference between the two survival experiences at each of the j death times.
( is sensitive to exposures with a constant risk ( = proportional hazards)
Q : tends to weight the early differences more heavily then the late ones. (powerful in detecting the ettect of short-term effect)

참고 자료

생존분석 입문 바이오통계
비모수통계학 MAXIMUM LIKELIHOOD ESTIMATION
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