The error is just a misleading error message. loading the data produced
column sdate as
str(prostate)
$ sdate :Classes 'labelled', 'dates' atomic [1:502] 2778 2820 2933 2999
3002 ...
.. ..- attr(*, "format")= symbol ddmmmyy
.. ..- attr(*, "label")= chr "Date on study"
prostate$sdate <- as.Date(prostate$sdate,origin="1970-01-01") # fixes the
problem and 'describe' runs
just as a comment: maybe the R dataset should have sdate as a Date class.
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