[R] ts basic question

[ripley@stats.ox.ac.uk]

On Tue, 27 Aug 2002, juli g. pausas wrote:

> Dear R collegues,
>
> I'd like to use the time-series facilities of R and I'm not sure how to
> set my dataset properly.
> I have monthly data, so the description could be:  ts(data,
> start=c(1951,1), frequency= 12)
> However, the data is a matrix of years (rows) and months (columns), as
> follows:
>
> > s1 <- read.table("stdata.txt", header=TRUE)
> > s1[1:3, ]
>   YEAR  JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC
> 1 1951  1.7  0.6 -0.8 -0.6 -1.0 -0.3 -1.4 -0.7 -1.3 -1.4 -1.0 -1.0
> 2 1952 -1.2 -1.1  0.0 -0.5  0.6  0.5  0.4 -0.4 -0.3  0.2 -0.2 -1.6
> 3 1953  0.2 -1.0 -0.8 -0.1 -2.2 -0.3 -0.1 -1.9 -1.5 -0.2 -0.4 -0.7
> >
>
> How can I create a ts object from this format?

Something like

ts(t(si), start=c(1951,1), frequency= 12)

since t will convert it to a matrix.

> Alternatively, I could delete the column YEAR from the file, read the
> file with scan to create a single vector (reading by rows), and then
> use: ts(s1, start=c(1951,1), frequency= 12).
> Is there a better way to do this?

Yes. Use skip in scan and don't alter the file.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
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

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