Newbie Time Series Questions
On Thu, 17 Oct 2002, 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 ...
Is that starting in Oct 1961 or what?
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)
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
I think you have a data frame or matrix. If a matrix, try klam.ts <- ts(as.vectior(t(klam.flow)), start=c(1961,10), frequency=12) If a data frame, try as.matrix and then the above.
Any advice on how to properly create the ts object so it looks and plots a la Figure 13.15 in VR?
The issue is to start with a `ts' object. The above may help, but your descriptions are not really consistent.
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 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._