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2007 Feb 01
2
How can I calculate conditional mean in a large dataset including date data
Dear R users,
I have a dataframe with two columns: first column is date data (e.g.
1/1/2000 with character format: daily data from 1/1/1970 till 31/12/2003)
and second column is temperature value. Now I'd like to calculate mean for
each month in a year (i.e. May 2001, June 1997) and mean for each month in
all of years. As the number of days in some months is different from others
I could