[R] HMisc describe -- error with dates
Frank E Harrell Jr
feh3k at spamcop.net
Wed Nov 12 01:32:02 CET 2003
On Tue, 11 Nov 2003 18:28:24 -0500
tmurph6 at po-box.mcgill.ca wrote:
> I am trying to use HMisc describe on a data frame. I have specified
> certain variables as dates using, for example:
> df1$aidsdate <- dates(aidsdate,format="day.mon.year",
> origin=c(month = 1, day = 1, year = 1960))
> When I use describe on the dataframe I get this error:
> Error in Ops.dates(weights, x) : * not defined for chron objects
> Has anyone had this problem? I had used the same method with an older
> version of R and HMisc and it worked.
> Should be be formatting date variables differently?
> Thank you!
> Tanya Murphy
In recent versions, describe for R recognizes date/times by one of the
following classes: 'POSIXt','POSIXct','chron'. If you really need to use
another date format I could be talked into extending the code for that if
you can remind me where dates( ) is found. -Frank
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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