Thanks Gabor for this reply. Your first reply answers my question, however
end is not. Here you said :
> set.seed(1)
> daily.dat <- zooreg(rnorm(500), start=as.Date("2000-01-01"), frequency=1)
> aggregate(daily.dat, as.yearmon, sd)
Jan 2000 Feb 2000 Mar 2000 Apr 2000 May 2000 Jun 2000 Jul 2000 Aug
2000
0.9370553 0.7743405 0.9514569 0.8813805 0.9188229 1.0969453 1.0327717
1.0392682
Sep 2000 Oct 2000 Nov 2000 Dec 2000 Jan 2001 Feb 2001 Mar 2001 Apr
2001
1.0276672 1.0173960 0.8953093 1.0964024 0.9696928 0.9507952 1.1275021
1.1410237
May 2001
1.5286202
But what I want is, to aggregate "all" data on a particular month for all
years and apply statistics on that aggregated data. Therefore I should get
only 12 values (for 12 months) not 17 values. Is there any way to do that?
Thanks,
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