Subject: RE: Is a ts of length one a ts? (PR#245)
From: Prof Brian Ripley (email@example.com)
Date: Wed 11 Aug 1999 - 22:57:01 EST
> Date: Wed, 11 Aug 1999 13:52:51 +0200 (CEST)
> From: Martyn Plummer <firstname.lastname@example.org>
> To: Prof Brian D Ripley <email@example.com>
> Subject: RE: Is a ts of length one a ts? (PR#245)
> Cc: firstname.lastname@example.org, Remail@example.com
> On 11-Aug-99 Prof Brian D Ripley wrote:
> > On Wed, 11 Aug 1999, Martyn Plummer wrote:
> >> On 10-Aug-99 firstname.lastname@example.org wrote:
> >> > Is there any good reason why a time series of length one is not
> >> > allowed by [.ts (you can certainly create one with ts)?
> >> It certainly has a start and an end value, but what's the
> >> frequency? If you want the tsp attribute of a time series
> >> to be well defined, then maybe you should disallow series
> >> of length 1.
> > I think the frequency is perfectly well defined, as that of the series you
> > subsetted.
> Is it?
> R 0.64.2:
> R> x <- ts(1:10)
> R> frequency(x)
>  1
> R> y <- x[c(2,4,6,8,10)]
> R> frequency(y)
>  0.5
I was only discussing the case of a subset of one, but you omitted
the next sentence. What I actually said was
`I think the frequency is perfectly well defined, as that of the series you
subsetted. How can extracting one observation change the frequency of
Obviously, subsetting a regularly spaced series can change the frequency.
-- Brian D. Ripley, email@example.com Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272860 (secr) Oxford OX1 3TG, UK Fax: +44 1865 272595
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: firstname.lastname@example.org _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
This archive was generated by hypermail 2b25 : Tue 04 Jan 2000 - 14:16:07 EST