You could put this data into a 3 dimensional array and then use the
apply function to apply a function (such as mean) over which ever
variables you choose.
Or you could put the data into a data frame in long format where you
have your 3 variable indices in 3 columns, then the data in a 4th
column.
Suppose I have data organized in the following way:
(P_i, M_j, S_k)
where i, j and k and indexes for sets.
I would like to analyze the data to get for example the following
information:
what is the average over k for
(P_i, M_j)
or what is the average over j and k for P_i.
My question is what woul
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