
Dear R forum,
 
I have a concern regarding a mathematical expression of the probability function (see below). I know how to write it for only one index i, but we have two : i (country) and j (year). We have a set of N observations of country year ij (or ith country in jth year).
 
Basically, I could replace ij as a one index t and call it as a country year observation. Anyway, how to write this expression correctly for two indices i and j? Or shall we put two product signs instead?
 
The expression is similar to this:
Large Mathematical Sign of Product as a function of (Xij), 
where the low subscript of the Product is ij=1 and an upper subscript is ij=N.
 
Thanks,
Julia
 
 
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