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

[John Kane]

--- Lauri Nikkinen <lauri.nikkinen at iki.fi> wrote:

> 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?

I'd think so but I don't know much about dates.  Gabor
is probably the person you need.  Good luck.

> 
> -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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