I'm trying to resolve a problem of Namespaces and probably have misunderstood
something basic.
In my quantreg package the function crq() has as its first argument a
formula that typically contains
something like this: Surv(y, ...) ~ foo, where Surv is a function from the
survival package which
quantreg suggests. When this syntax is encountered in ordinary usage Surv
is resolved, I believe,
because near the beginning of the crq code there is the locution:
if(!requireNamespace("survival", quietly = TRUE))
stop("crq requires survival package to be installed")
However, when R CMD check tries to do one of the crq examples I see:
> f <- crq(Surv(y,d,type = "left") ~ x, method = "Portnoy")
Error in eval(expr, envir, enclos) : could not find function "Surv"
Calls: crq ... eval -> model.frame -> model.frame.default -> eval -> eval
Execution halted
Can someone suggest a fix?
Roger
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