45 lines
1.5 KiB
Plaintext
45 lines
1.5 KiB
Plaintext
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R Under development (unstable) (2018-04-09 r74565) -- "Unsuffered Consequences"
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Copyright (C) 2018 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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> #
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> # New tests 4/2010 to validate strata by covariate interactions
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> #
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> library(survival)
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> 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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> aeq <- function(x,y) all.equal(as.vector(x), as.vector(y))
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>
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> tdata <- lung
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> tdata$sex <- lung$sex +3
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>
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> # Both of these should produce warning messages about singular X, since there
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> # are ph.ecog=3 subjects in only 1 of the strata.
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> # Does not affect the test
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> fit1 <- coxph(Surv(time, status) ~ age + sex:strata(ph.ecog), lung)
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> fit2 <- coxph(Surv(time, status) ~ age + sex:strata(ph.ecog), tdata)
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>
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> aeq(fit1$coef, fit2$coef)
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[1] TRUE
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> aeq(fit1$var, fit2$var)
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[1] TRUE
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> aeq(predict(fit1), predict(fit2))
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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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0.692 0.036 0.727
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