[R] Problems with computing an aggregated score

[Hatsch]

Hi all,

I have a problem with computing a new variable as an aggregated score of
other variables.

Say, I have 10 variables for 1,000 observations (people). Every variable may
have values between 0 and 8. What I would like to do is computing the mean
of the individual top 3 values for every person.

Exampe: The values for the 10 variables (v1 to v10) for person A, B and C
are as follows:

A 0 1 0 2 5 8 3 0 4 0
B 6 4 3 0 0 0 0 5 0 0
C 0 0 8 0 0 8 0 0 0 0

So, I would like to compute a new variable for the mean of the individual
top 3 values, which would result for person A, B and C in the following:

A (8+5+4)/3 = 5.67
B (6+5+4)/3 = 5
C (8+8+0)/3 = 5.33

Is there any way to do this?

Any clues, hints and suggestions are highly appreciated,
many thanks in advance
Johannes
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