test_ushape_cox | R Documentation |
Test U-shape relationship This function checks for a U-shaped relationship between survival time and a set of variables. Users are required to create and set the datadist option globally before using this function.
test_ushape_cox(my_data, variables)
my_data |
A dataframe containing the data with survival times and event indicators. |
variables |
A character vector specifying the names of the variables to be tested. |
No return value, produces a plot as a side effect.
library(rms)
data_path <- system.file("extdata", "cox_data.csv", package = "RGS")
my_data <- read.csv(data_path)
# create and set the datadist option globally
dd <- datadist(my_data)
options(datadist = "dd")
test_ushape_cox(my_data, c("u1", "u2"))
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