From therne@u @end|ng |rom m@yo@edu  Thu Nov  3 19:05:41 2022
From: therne@u @end|ng |rom m@yo@edu (Therneau, Terry M., Ph.D.)
Date: Thu, 03 Nov 2022 13:05:41 -0500
Subject: [Rd] as.Date withoug "origin"
Message-ID: <ff6a6b$iuo1bs@ironport10.mayo.edu>

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 at mayo.edu

"TERR-ree THUR-noh"

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[Rd] as.Date withoug "origin"
Therneau, Terry M., Ph.D.