24 lines
616 B
R
24 lines
616 B
R
options(na.action=na.exclude) # preserve missings
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options(contrasts=c('contr.treatment', 'contr.poly')) #ensure constrast type
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library(survival)
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# Tests using the rats data
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#
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# (Female rats, from Mantel et al, Cancer Research 37,
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# 3863-3868, November 77)
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rfit <- coxph(Surv(time,status) ~ rx + frailty(litter), rats,
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method='breslow', subset= (sex=='f'))
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rfit
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rfit$iter
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rfit$df
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rfit$history[[1]]
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rfit1 <- coxph(Surv(time,status) ~ rx + frailty(litter, theta=1), rats,
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method='breslow', subset=(sex=="f"))
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rfit1
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rfit2 <- coxph(Surv(time,status) ~ frailty(litter), rats, subset=(sex=='f'))
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rfit2
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