# hw3sol - Homework 3 solution for STA 6934/4930 1 a It seems...

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Unformatted text preview: Homework 3 solution for STA 6934/4930 1. a) It seems ok to use PH model. b) Fail to reject the null hypothesis, so we can use PH model. 2. a) see the attached r output b) The hazard ratio for males and females isn’t constant across race with α = 0.1. c) No significant outlines. d) No any influential points. R code and output please see the following pages 3. a) P (S (T) < t ) = P ( 1 - F (T) < t ) = 1- P (F (T) < t ) = 1 – ( 1 – t ) = t b) P (S-1 (U) > t) = P (( - log u) / r > t ) = t = P (S (T) < t ) 4. See notes qq q q qq qq q qq qq q qq qq qq q qq qq q q q q q q q q q qq q q q q q qq 0 200 400 kidney\$obs 600 800 q q q q q q q q q q q q q q q q qq qq qq qq qq q qq qqq qq qq qqqq q qq qq qq qq q q q q q q q q q q q q qq q q q qq qq q qq q q qq qq qq q q q q q q qq q q 1 0 qq qq qq qq qqq qqq qq q qq qqq qqq qqqq qqqq qqqq qqqq q qq qqqq qqqqq q q q qqq q qqq qqqqq qqqqq qqqqq qqqq q q qqq q qqqq qqqq q qqqq q q qqq q q qqqqq qqqq qqqq qqq q qq qq q q q qq q q q qqq qqq qqq qqqq qqqq qqqq q qqq qqq qq q q q qq q q qqqqq qqqq q qqqqqqq q qqqqqqqq qqqqqqqq q qqqqqq qqqqq q qqqqq qqqqq qqqqq qq q qqqqqq qqqq q q qqqqqq q q qqqqq qqqq qq qq q qq qq q qqqq q qq q q q qqq qq qq q qq q q qq q qqq qqq qqq q qq qq q q qq qq q qqqq q qqq qqqq qqqq qqqq qqqq q qqqqq qqqqq q qqqqq qqqq q q q qqqq q q q qq qq qq q q q qq q q q q q q q q −1 −0.4 0.0 0.4 dev.resid 2 q mart.resid qq qq qq qq qq qqq qq q q q q q q q q 3 0.8 qq qq qq qq qqq q qqq qq q q q qq q q qq q qqq qq q qqq qqq qq qq q q qq qq qq 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You are welcome to redistribute it under certain conditions. Type `license()' or `licence()' for distribution details. R is a collaborative project with many contributors. Type `contributors()' for more information. Type `demo()' for some demos, `help()' for on-line help, or `help.start()' for a HTML browser interface to help. Type `q()' to quit R. > library(survival) > library(splines) > kidney<-read.table("C:\\Documents and Settings\\lzhang\\Desktop\\sta 6934\\hw3\\kidney.txt",header=T) > attach(kidney) > kid.gender.race<-coxph(Surv(dtime,dind)~gender+race) > summary.coxph(kid.gender.race) Call: coxph(formula = Surv(dtime, dind) ~ gender + race) n= 863 coef exp(coef) se(coef) z p gender -0.0935 0.91 0.174 -0.536 0.59 race 0.2200 1.25 0.211 1.040 0.30 gender race exp(coef) exp(-coef) lower .95 upper .95 0.91 1.098 0.647 1.28 1.25 0.803 0.823 1.89 Rsquare= 0.002 (max possible= 0.87 ) Likelihood ratio test= 1.35 on 2 df, p=0.51 Wald test = 1.39 on 2 df, p=0.498 Score (logrank) test = 1.4 on 2 df, p=0.497 > kid.gender.race.genderrace<-coxph(Surv(dtime,dind)~gender+race+gender*race) > summary.coxph(kid.gender.race.genderrace) Call: coxph(formula = Surv(dtime, dind) ~ gender + race + gender * race) n= 863 coef exp(coef) se(coef) z p gender -0.994 0.370 0.548 -1.81 0.070 race -0.834 0.434 0.662 -1.26 0.210 gender:race 0.745 2.107 0.427 1.75 0.081 gender race gender:race exp(coef) exp(-coef) lower .95 upper .95 0.370 2.702 0.126 1.08 0.434 2.303 0.119 1.59 2.107 0.474 0.912 4.87 Rsquare= 0.005 (max possible= Likelihood ratio test= 4.37 on Wald test = 4.64 on Score (logrank) test = 4.74 on 0.87 ) 3 df, 3 df, 3 df, p=0.224 p=0.200 p=0.192 file:///A|/STA6934/HW3/2R_output.txt (1 of 2) [10/20/2003 12:05:36 AM] file:///A|/STA6934/HW3/2R_output.txt > > > > > > > > > > > > > > > > mart.resid<-residuals(kid.gender.race,type="martingale") dev.resid<-residuals(kid.gender.race,type="deviance") par(mfrow=c(2,2)) plot(kidney\$obs,mart.resid) plot(kidney\$obs,dev.resid) dfbetascale.resid<-residuals(kid.gender.race,type="dfbetas") par(mfrow=c(3,2)) plot(kidney\$obs,dfbetascale.resid[,1]) plot(kidney\$obs,dfbetascale.resid[,2]) plot(kidney\$gender,dfbetascale.resid[,1]) plot(kidney\$race,dfbetascale.resid[,2]) LD.mat<-(dfbetascale.resid) %*% kid.gender.race\$var %*% t(dfbetascale.resid) LD<-diag(LD.mat) plot(kidney\$obs,LD,main="Likelihood Displacement Statistics") file:///A|/STA6934/HW3/2R_output.txt (2 of 2) [10/20/2003 12:05:36 AM] ...
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## This note was uploaded on 01/15/2012 for the course STA 6934 taught by Professor Young during the Fall '08 term at University of Florida.

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