Thanks a lot; this helps a lot.

On Sat, Jan 30, 2010 at 11:07 AM, Gabor Grothendieck <
ggrothendieck@gmail.com> wrote:

> See ?window.ts, e.g.
>
> > # 1
> > tt <- ts(c(0.71, 0.63, 0.85, 0.44, 0.61, 0.69, 0.92, 0.55),
> +   start = 1960, frequency = 4)
> > at <- c(1961, 3)
> > window(tt, at, at)[1]
> [1] 0.92
>
> Note that 1961.00, 1961.25, 1961.50 and 1961.75 represent the 4
> quarters of 1961 so this also works:
>
> # 2
> > window(tt, 1961.5, 1961.5)[1]
> [1] 0.92
>
> (Without the [1], the above commands return a time series of length 1
> rather than just a number.)
>
> A third approach is to convert to zoo.   as.zoo.ts converts a ts
> series to a zoo series whose index can be accessed via year + fraction
> notation and window.zoo supports an index argument (so we can avoid
> having to specify the index twice):
>
> > # 3
> > library(zoo)
> > coredata(window(as.zoo(tt), index = 1961.5))
> [1] 0.92
>
> (Without coredata it returns a length 1 zoo series rather than just a
> number.)
>
> On Sat, Jan 30, 2010 at 9:22 AM, Dipankar Basu <basu.15@gmail.com> wrote:
> > Hi All,
> >
> > I have a very simple question about a time series object: how to access
> > values for a particular year and quarter (say)?
> >
> > Suppose, following
> >
> > http://www.stat.pitt.edu/stoffer/tsa2/R_time_series_quick_fix.htm
> >
> > I have read in data as a time series; here is how it looks.
> >
> > *       Qtr1  Qtr2  Qtr3  Qtr4
> >  1960  0.71  0.63  0.85  0.44
> >  1961  0.61  0.69  0.92  0.55
> >    .     .     .     .     .
> >    .     .     .     .     .
> >  1979 14.04 12.96 14.85  9.99
> >  1980 16.20 14.67 16.02 11.61*
> >
> > How do I access the value for 1961 quarter 3 (say)?
> >
> > Dipankar
> >
> >        [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>

	[[alternative HTML version deleted]]

