On Fri, Jun 22, 2012 at 3:45 PM, APOCooter <mikeedinge...@gmail.com> wrote: > > [snip and rearrange] > >> try to put your data in a proper time series class (zoo/xts if I >>might give a personal-ish plug) which will make all these calculations >>much easier. > > I thought that's what I was doing with as.POSIXlt?
as.POSIXlt converts your time stamps to one of many formats (though it's really probably better to use as.POSIXct instead) -- zoo/xts objects are "containers" for time series data and provide you with methods/wrappers to do many common time-series style calculations. E.g., rollapply() or period.apply() Best, Michael ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
