data("sTRACE",package="timereg")
dt<- sTRACE
dt$time2 <- dt$time^2
dt$wmi2 <- dt$wmi^2
head(dt)
dcor(dt)
dcor(dt,~time+wmi)
dcor(dt,~time+wmi,~vf+chf)
dcor(dt,time+wmi~vf+chf)
dcor(dt,c("time*","wmi*"),~vf+chf)
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