45 lines
1.4 KiB
Plaintext
45 lines
1.4 KiB
Plaintext
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R Under development (unstable) (2019-08-23 r77061) -- "Unsuffered Consequences"
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Copyright (C) 2019 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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> # the way a +cluster() term is handled in coxph has implications for update.
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>
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> fit1 <- coxph(Surv(time, status) ~ age, cluster= inst, lung)
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> fit2 <- coxph(Surv(time, status) ~ age + cluster(inst), lung)
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> all.equal(fit1, fit2)
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[1] TRUE
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>
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> fit3 <- coxph(Surv(time, status) ~ age + sex + cluster(inst), lung)
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>
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> test1 <- update(fit1, .~ .+ sex)
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> all.equal(test1, fit3)
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[1] TRUE
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>
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> # Gives a spurious warning message
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> test2 <- update(fit1, . ~ age + sex + cluster(inst), lung)
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Warning message:
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In coxph(formula = Surv(time, status) ~ age + sex + cluster(inst), :
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cluster appears both in a formula and as an argument, formula term ignored
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> all.equal(test2, fit3)
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[1] TRUE
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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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0.751 0.039 0.791
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