34 lines
1.0 KiB
R
34 lines
1.0 KiB
R
library(survival)
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#
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# The survival code was failing for certain data sets when called as
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# survfit(Surv(time2-time1, status) ~ ......
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# The issue was how tied floating point numbers are handled, and the
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# fact that unique(x), factor(x) and tapply(x) are not guarranteed to
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# all be the same.
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# This test fails in survival 2.36-5, fixed in 2.36-6. Data sets that
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# can cause it are few and far between.
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#
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load('ties.rda')
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x <- time2 -time1
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# Here is the heart of the old problem
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# length(unique(x))== length(table(x))
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# And the prior fix which worked ALMOST always
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# x <- round(x, 15)
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# length(unique(round(x,15)))== length(table(round(x,15)))
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fit1 <- survfit(Surv(x) ~1)
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length(fit1$time) == length(fit1$surv)
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# a second test, once "rounding.R"
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tdata <- data.frame(time=c(1,2, sqrt(2)^2, 2, sqrt(2)^2),
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status=rep(1,5),
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group=c(1,1,1,2,2))
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fit <- survfit(Surv(time, status) ~ group, data=tdata)
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all.equal(sum(fit$strata), length(fit$time))
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