[R] changing the time base in a ts

[Dr Carbon]

Sorry, what I meant was that I want dat.sub[1] to line up with dat[7],
dat.sub[2] to line up with dat[19], dat.sub[3] with dat[12+12+7],
etc...


On Mon, 31 Jan 2005 18:34:55 +0100, Uwe Ligges
<ligges at statistik.uni-dortmund.de> wrote:
> Dr Carbon wrote:
> > I'm probably apporaching this all wrong to start but....
> >
> > Suppose I have a monthly time series and I want to compute the mean of
> > months 6,7, and 8. I want to plot the original time series and the
> > seasonal time series, one above the other. When I do that as below the
> > time series don't line up for reasons that are obvious. How can I
> > change the base of the seasonal time series so I can make my plots
> > line up? That is, I want the points for the seasonal plot to line up
> > with cycle 6 of the first plot.
> >
> > Thanks.
> >
> >
> > dat <- ts(rnorm(12*20), start = c(1980,1), frequency = 12)
> > plot(dat)
> > dat.sub <- dat
> > dat.sub[cycle(dat.sub) < 6] <- NA
> > dat.sub[cycle(dat.sub) > 8] <- NA
> > dat.sub <- aggregate(dat.sub, nfrequency = 1, FUN = mean, na.rm = T)
> > tsp(dat)
> > tsp(dat.sub)
> > par(mfrow = c(2, 1))
> > plot(dat)
> > plot(dat.sub, type = "b")
> 
>   plot(dat)
>   plot(dat.sub, type = "b", xlim=c(1980, 2000))
> 
> Uwe Ligges
> 
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>