Hi
tt<-ts((1:(4*12)), frequency=12)
tapply(tt,cycle(tt), mean)
However you could find it yourself more quickly just browsing docs as I did.
Regards
Petr
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Victor
> Sent: Tuesday, February 18, 2014 9:48 AM
> To: r-help at r-project.org
> Subject: [R] TS: Calculating the mean by month
>
> I have the following (monthly) ts time-series:
> > t
> Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
> 2002 5.3 9.4 12.1 14.4 17.9 23.5 24.3 23.6 19.3 16.3 13.9 9.0
> 2003 7.5 5.4 10.4 13.3 19.9 25.6 26.2 27.6 20.6 15.5 12.5 8.0
> 2004 6.3 7.8 9.6 13.6 16.5 22.0 24.3 24.6 21.3 18.1 11.7 9.0
> 2005 5.7 5.4 9.7 13.0 18.9 22.9 25.0 23.4 21.4 16.5 11.3 6.7
>
> I would like to calculate the mean of data by month.
>
> How can I do it with a ts time series?
>
> Many thanks
> Vittorio
>
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> and provide commented, minimal, self-contained, reproducible code.
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