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yourmeans
2010 Nov 18
2
conditional mean between two data frames with different levels
Hi guys, I have two data frames: one referred to 2008 and one to 2009. Their
structure is identical except for the different data in them.
I need to create a vector alfa of the same length of the dataframe 2009 and
fill each element with the mean of 2008$var1 conditional to the subgroup
indicated by a factor variable in 2009$var2.
In this case it would be easy to use the function