50 lines
1.5 KiB
Plaintext
50 lines
1.5 KiB
Plaintext
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R Under development (unstable) (2023-05-10 r84417) -- "Unsuffered Consequences"
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Copyright (C) 2023 The R Foundation for Statistical Computing
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Platform: x86_64-pc-linux-gnu (64-bit)
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R is free software and comes with ABSOLUTELY NO WARRANTY.
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You are welcome to redistribute it under certain conditions.
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Type 'license()' or 'licence()' for distribution details.
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R is a collaborative project with many contributors.
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Type 'contributors()' for more information and
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'citation()' on how to cite R or R packages in publications.
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Type 'demo()' for some demos, 'help()' for on-line help, or
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'help.start()' for an HTML browser interface to help.
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Type 'q()' to quit R.
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> library(survival)
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> #
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> # Check out intercept/interaction for Frank H
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> #
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> age2 <- lung$age - 50
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> fit1 <- coxph(Surv(time, status) ~ age * strata(sex), lung)
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> fit2 <- coxph(Surv(time, status) ~ age2*strata(sex), lung)
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>
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> tdata <- data.frame(age=50:60, age2=0:10, sex=c(1,2,1,2,1,2,1,2,1,2,1))
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>
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> surv1 <- survfit(fit1, tdata)
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> surv2 <- survfit(fit2, tdata)
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> # The call won't match, nor the newdata data frame
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> icall <- match(c("newdata", "call"), names(surv1))
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> all.equal(unclass(surv1)[-icall], unclass(surv2)[-icall])
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[1] TRUE
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>
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>
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> # It should match what I get with a single strata fit
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>
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> fit3 <- coxph(Surv(time, status) ~ age, data=lung,
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+ init=fit1$coef[1], subset=(sex==1), iter=0)
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> surv1b <- survfit(fit3, newdata=list(age=c(50,52, 54)))
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> all.equal(c(surv1b$surv), surv1[c(1,3,5)]$surv)
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[1] TRUE
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>
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>
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>
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>
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> proc.time()
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user system elapsed
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0.920 0.070 0.981
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