36 lines
1.2 KiB
Plaintext
36 lines
1.2 KiB
Plaintext
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R Under development (unstable) (2019-01-23 r76006) -- "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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> # Check out the Dory&Korn confidence interval option
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> #
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> tdata <- data.frame(time= 1:10,
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+ status=c(1,0,1,0,1,0,0,0,1,0))
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>
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> fit1 <- survfit(Surv(time, status) ~1, tdata, conf.lower='modified')
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> fit2 <- survfit(Surv(time, status) ~1, tdata)
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>
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> stdlow <- fit2$std.err * sqrt(c(1, 10/9, 1, 8/7, 1, 6/5, 6/4, 6/3, 1, 2/1))
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> lower <- exp(log(fit2$surv) - qnorm(.975)*stdlow)
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> all.equal(fit1$lower, lower, check.attributes=FALSE)
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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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0.748 0.036 0.786
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