Re: [R] How to get week of the year, scale 1-52?

From: Lauri Nikkinen <lauri.nikkinen_at_iki.fi>
Date: Tue, 18 Mar 2008 15:18:34 +0200

Yeah, that's correct. I can accept that there is more than 52 weeks in a year (:-)) but it's hard to accept that the first week e.g in this example is 00 (year 2008). Should the first week be the first one, 1?

-Lauri

2008/3/18, John Kane <jrkrideau_at_yahoo.ca>:
> 365/7 != 52. You have more than 52 weeks in each
> year.
>
>
> --- Lauri Nikkinen <lauri.nikkinen_at_iki.fi> wrote:
>
> > R users,
> >
> > I have a vector of dates
> >
> > days <- seq(as.Date("2007/1/1"),
> > as.Date("2008/1/31"), "days")
> >
> > and I would like to have week numbers from 1 to 52
> > for each year. How
> > do I do that? Now I get 00-53 using
> >
> > format(days, "%W")
> >
> > > range(format(days, "%W"))
> > [1] "00" "53"
> >
> > I have read "Date and Time Classes in R" (R news
> > 01/04 by Gabor
> > Grothendieck and Thomas Petzoldt) with no help.
> >
> > Thanks
> > Lauri
> >
> > ______________________________________________
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> >
>
>
>
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