[R] 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

Re: [R] How can I calculate conditional mean in a large dataset including date data

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Re: [R] How can I calculate conditional mean in a large dataset including date data

, February 01, 2007 8:11 AM To: r-help@stat.math.ethz.ch Subject: [R] 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

Re: [R] How can I calculate conditional mean in a large dataset including date data

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