[R] Manipulation in timeSeries object:how to use the function "applySeries" by daily?

[Jeff Ryan]

Take a look at xts, a time series class that extends zoo and is compatible
(forward and backwards) with all major time-series classes, including
timeSeries from Rmetrics.

It has a few functions that may be of interest:

?endpoints
?period.apply

It may also be useful to use the Fortran-based aggregation by time functions
to turn your series into an OHLC series.

See ?to.period

quantmod also has a ?periodReturn function that may be of interest.

Some examples of all the above can be found at  http://www.quantmod.com
http://www.quantmod.com 

HTH
Jeff

tedzzx wrote:
> 
> Hi all 
> I have some tick-by-tick data and I have calculated the intraday returns.
> I want to sum up the intraday squared returns to calculate the daily
> volatility(or daily variance). I know that the s-plus FinMerics has the
> function aggregateSeries function that can be apply to daily data:
> aggregateSeries(x, Fun, by="daily"), but the counterpart function in
> R:applySeries can not be apply to daily data. This function has the
> argument by=c("monthly", "quartly"). 
> Can we find some way to mimic the aggregateSeries function in s-plus?
> 
> Thanks in advance
> 
> Ted
> 

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