HMisc describe -- error with dates

On Tue, 11 Nov 2003 20:40:50 -0500 (EST)

dates is part of chron.  There may be something wrong in 
Hmisc's detection of chron objects.

chron(1)
[1] 01/02/70

isChron(chron(1))
FALSE

---

Date: Tue, 11 Nov 2003 20:06:38 -0500 
From: <tmurph6 at po-box.mcgill.ca>
To: Frank E Harrell Jr <feh3k at spamcop.net> 
Cc: <r-help at stat.math.ethz.ch> 
Subject: Re: [R] HMisc describe -- error with dates 

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?
I like POSIX but chron should be workable.  The fix for isChron in Hmisc
is:

function(x) {
  cl <- class(x)
  dc <- if(.R.) c('POSIXt','POSIXct','dates','times','chron') else
                c('timeDate','date','dates','times','chron')
  length(cl) && any(cl %in% dc)
}

But describe also runs this command:

  if(isdatetime) notime <- all(format(x.unique,"%H%M%S")=='000000')

and such calls to format for chron objects (which actually calls
format.dates if x.unique is a dates object) do not work.  So a few more
modifications will need to be made in describe to work with chron objects,
when time allows.

Frank
Thank you!

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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---
Frank E Harrell Jr    Professor and Chair            School of Medicine
                      Department of Biostatistics    Vanderbilt University

HMisc describe -- error with dates

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