43 lines
1.3 KiB
Plaintext
43 lines
1.3 KiB
Plaintext
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R version 2.7.1 (2008-06-23)
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Copyright (C) 2008 The R Foundation for Statistical Computing
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ISBN 3-900051-07-0
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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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> 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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Loading required package: splines
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>
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> #
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> # A test of NULL models
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> #
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> fit1 <- coxph(Surv(stop, event) ~ rx + strata(number), bladder, iter=0)
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> fit2 <- coxph(Surv(stop, event) ~ strata(number), bladder)
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>
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> all.equal(fit1$loglik[2], fit2$loglik)
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[1] TRUE
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> all.equal(fit1$resid, fit2$resid)
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[1] TRUE
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>
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>
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> fit1 <- coxph(Surv(start, stop, event) ~ rx + strata(number), bladder2, iter=0)
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> fit2 <- coxph(Surv(start, stop, event) ~ strata(number), bladder2)
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>
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> all.equal(fit1$loglik[2], fit2$loglik)
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[1] TRUE
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> all.equal(fit1$resid, fit2$resid)
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[1] TRUE
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>
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