Difficult to guess why, but I reckon you should use ts() instead of as.ts. Otherwise set the tsp-attribute correctly. Eg :
> x <- cumsum(1+round(rnorm(20),2)) > as.ts(x) Time Series: Start = 1 End = 20 Frequency = 1 [1] 0.87 3.51 4.08 4.20 3.25 4.63 6.30 6.89 9.28 9.93 10.19 9.97 10.20 11.51 11.52 11.53 12.97 14.04 17.02 18.47 > tseries <- ts(x,frequency=12,start=c(2004,3)) > tseries Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2004 0.87 3.51 4.08 4.20 3.25 4.63 6.30 6.89 9.28 9.93 2005 10.19 9.97 10.20 11.51 11.52 11.53 12.97 14.04 17.02 18.47 > tsp(x) <- c(2004+2/12,2005.75,12) > as.ts(x) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2004 0.87 3.51 4.08 4.20 3.25 4.63 6.30 6.89 9.28 9.93 2005 10.19 9.97 10.20 11.51 11.52 11.53 12.97 14.04 17.02 18.47 See ?ts to get the options right. I suggest to use the function ts() instead of assigning the tsp attribute. ) Cheers Joris On Mon, Jul 5, 2010 at 9:35 AM, nuncio m <nunci...@gmail.com> wrote: > Dear useRs, > I am trying to construct a time series using as.ts function, surprisingly > when I plot > the data the x axis do not show the time in years, however if I use > ts(data), time in years are shown in the > x axis. Why such difference in the results of both the commands > Thanks > nuncio > > > -- > Nuncio.M > Research Scientist > National Center for Antarctic and Ocean research > Head land Sada > Vasco da Gamma > Goa-403804 > > [[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. > -- Joris Meys Statistical consultant Ghent University Faculty of Bioscience Engineering Department of Applied mathematics, biometrics and process control tel : +32 9 264 59 87 joris.m...@ugent.be ------------------------------- Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php ______________________________________________ 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.