[R] Calculating quarterly statistics for time series object

From: Megh Dal <megh700004_at_yahoo.com>
Date: Sun, 29 Jun 2008 00:17:52 -0700 (PDT)

I have time series observation on daily frequencies :

date1 = seq(as.Date("01/01/01", format = "%m/%d/%y"), as.Date("12/31/02", format = "%m/%d/%y"), by = 1) len1 = length(date1); data1 = zoo(matrix(rnorm(len1, mean=0, sd=SD*0.5), nrow = len1),  date1) plot(data1)

Now I want to calculate 1. Quarterly statistics like mean, variance etc and 2. Weekly statistics, where as per my definition week starts from Wednesday and ends on Tuesday.

I can define some 'for' loop for doing those. However it takes considerably amount of time. Is there any advance methods in R to do the same?


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