aggredating date data
?aggregate I would transfer your date character sting into a date object (as.POSIXct) and then extract month or week numbers (?format) from this vector and use them as indices for the aggregate function. There may be more elegant ways though.... HTH Jannis --- analyst41 at hotmail.com <analyst41 at hotmail.com> schrieb am Mi, 12.1.2011:
Von: analyst41 at hotmail.com <analyst41 at hotmail.com>
Betreff: [R] aggredating date data
An: r-help at r-project.org
Datum: Mittwoch, 12. Januar, 2011 20:20 Uhr
I tried a date by date forecast of a
time series and it seems to be
too wild.? How can I aggregate the date into weeks or
months as
required?
Thanks.
The input looks like
ID datadate("YYYY-MM-DD")? value_for_day
--? ???-----? ? ? ?
? ? ? ? ? ? ? ?
? ? ? ? -------
--? ???------? ? ?
? ? ? ? ? ? ? ?
? ? ? ???--------
and I want to be able to change it to
ID dataweek value_for_week
or
ID datamonth value_ for_ month
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