Hi,
I have a ts object with a frequency of 4, i.e., quarterly data, and I would
like to calculate the mean for each quarter. So for example:
> ts.data=ts(1:20,start=c(1984,2),frequency=4)
> ts.data
Qtr1 Qtr2 Qtr3 Qtr4
1984 1 2 3
1985 4 5 6 7
1986 8 9 10 11
1987 12 13 14 15
1988 16 17 18 19
1989 20
If I do this manually, the mean for the 1st quarter would be
mean(c(4,8,12,16,20)), which is 12. But I am wondering if there is a R
function that could do this faster. I tried aggregate.ts but it didn't work:
> aggregate(ts.data,nfrequency=4,mean)
Qtr1 Qtr2 Qtr3 Qtr4
1984 1 2 3
1985 4 5 6 7
1986 8 9 10 11
1987 12 13 14 15
1988 16 17 18 19
1989 20
Does anyone know what am I doing wrong?
--
Tom
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