[R] r equivalent of egen? Not tapply

[Spencer Graves]

	  I don't know Stata, and I don't know if I understand your question. 
Consider the following:

 > (AList <- as.list(rep(letters[1:3], 2))
+ )
[[1]]
[1] "a"

[[2]]
[1] "b"

[[3]]
[1] "c"

[[4]]
[1] "a"

[[5]]
[1] "b"

[[6]]
[1] "c"

 > (unlist(AList))
[1] "a" "b" "c" "a" "b" "c"
 > table(unlist(AList))

a b c
2 2 2

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	  spencer graves

Thomas Davidoff wrote:

> I have a list that has about 50 elements, each repeated many times (a  
> list of states by observation).  I want to create a vector with the  
> same length with the same value repeated over and over again within  
> states.  The value I want is the number of observations that are in  
> the same state as each observation.
> In stata, this is simply egen statesum = count(state), by(state).
> What is the r equivalent?  tapply just gives me 50 observations.  No  
> luck yet trying apply, lapply, etc.
> Thomas Davidoff
> Assistant Professor
> Haas School of Business
> UC Berkeley
> Berkeley, CA 94720
> phone:     (510) 643-1425
> fax:        (510) 643-7357
> davidoff at haas.berkeley.edu
> http://faculty.haas.berkeley.edu/davidoff
> 
> 
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