37 lines
1.3 KiB
Plaintext
37 lines
1.3 KiB
Plaintext
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R Under development (unstable) (2020-06-10 r78681) -- "Unsuffered Consequences"
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Copyright (C) 2020 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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> # Verify the values found in the Royston paper
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> library(survival)
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>
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> pbc2 <- na.omit(pbc[,-1]) # no id variable, no missings
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>
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> pfit1 <- coxph(Surv(time, status==2) ~ . + log(bili) - bili, pbc2,
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+ ties="breslow")
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> # backwards elimination was used to eliminate all but 8
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> pfit2 <- coxph(Surv(time, status==2) ~ age + log(bili) + edema + albumin +
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+ stage + copper, data=pbc2, ties="breslow")
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>
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> temp <- rbind(royston(pfit1), royston(pfit1, adjust=TRUE),
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+ royston(pfit2), royston(pfit2, adjust=TRUE))
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> all.equal(round(temp[,1], 2), c(2.86, 2.56, 2.69, 2.59))
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[1] TRUE
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>
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> proc.time()
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user system elapsed
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0.824 0.052 0.868
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