[R] Newbie Time Series Questions

Achim Zeileis
Thu, 17 Oct 2002 20:39:10 -0000

Robert Schick wrote:
>
> I have a data set of monthly river flows from 1960-2000, which are
> similar in structure to the nottem data:
>
> > klam.flow
>       Oct  Nov  Dec  Jan  Feb   Mar  Apr  May  Jun  Jul  Aug  Sep
> 1961 1461 1716 2524 1773 1906  2005 1756 1575 1387  983 1094 1382
> 1962 1907 2253 1985 1907 1769  1676 2634 1386  929  766  968 1309
> ...
>
> I tried plotting with
>
> > ts.plot(klam.flow)
>
> Which quickly led me to realize the data aren't a "ts"
object, as it
> plotted 40 stacked lines instead of one long series. I've tried
> converting to this using ts or as.ts, e.g.
>
> > klam.ts <- ts(data=klam.flow, start=1960,end=2000, frequency=12)

If I understand your data correctly they start in October 1961? Then you
should do something like

R> klam.flow2 <- ts(as.vector(t(klam.flow)), start = c(1961, 10), freq 12)
R> plot(klam.flow2)

This turns your time series to one long vector first and then adds the
"ts" properties.
Z

> But this seems to explode the number of time series, e.g.
>
> > klam.ts
>           Oct  Nov  Dec  Jan  Feb   Mar  Apr  May  Jun  Jul  Aug  Sep
> Jan 1960 1461 1716 2524 1773 1906  2005 1756 1575 1387  983 1094 1382
> Feb 1960 1907 2253 1985 1907 1769  1676 2634 1386  929  766  968 1309
> Mar 1960 2511 2852 3661 2103 2189  2548 3841 2937  857  743 1058 1574
> ...
>
> Any advice on how to properly create the ts object so it looks and plots
> a la Figure 13.15 in VR?
>
> I'm using R 1.60 on a Windows 2000 box.
>
> Thanks
> --
> Rob Schick
> Research Associate
> NOAA Fisheries
> Santa Cruz Lab
> 110 Shaffer Road
> Santa Cruz, CA 95060
> Phone: 831.420.3960
>
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