[R] Apply Function to List by Group Returning Result with Dim of List
jamesrobinsonjnr at gmail.com
Fri Jan 20 00:42:08 CET 2012
I have a panel data set defined as a simple data.frame with a factor age and
income. I would like to generate the results of a set function such as (sum,
mean, or even diff) separate for each factor (category or age group).
However I want the result to have the same dimension as the overal
data.frame. Therefore, I expect to get repeaded the same result for each
item within a category, but different accross categories.
age income avg_inc
20 100 100
20 90 100
20 110 100
30 200 200
30 250 200
30 150 200
What builtin function can assist in doing this without my having to write
loops. I know in Eviews there is the sumsby, meansby, minsby and so forth.
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