[R] HMisc describe -- error with dates
tmurph6 at po-box.mcgill.ca
Wed Nov 12 02:06:38 CET 2003
I am using the chron package. I have no preference for which function I use. I
just want the most reliable format for HMisc functions and general plotting. I
like the ddmonyyy formats (e.g. 11NOV2003). What would you recommend?
Quoting Frank E Harrell Jr <feh3k at spamcop.net>:
> On Tue, 11 Nov 2003 18:28:24 -0500
> tmurph6 at po-box.mcgill.ca wrote:
> > Hello,
> > 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!
> > Sincerely,
> > 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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