[Rd] as.Date withoug "origin"

[Therneau, Terry M., Ph.D.]

Add my name to those who think this is a good change.

As someone who works daily with medical research data, the number of times I have been 
caugth by failure of statements like
    as.Date(ifelse( is.na(prog.dt), lastfu.dt, prog.dt)
is a large annoyance.    Replace ifelse by any number of selection processes for choosing 
among ending dates.

Terry T.

-- 
Terry M Therneau, PhD
Department of Quantitative Health Sciences
Mayo Clinic
therneau using mayo.edu

"TERR-ree THUR-noh"

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