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Resolving partial sums - For loop?

Hi all,

I have an interesting issue I am about to take on. I need to calculate a partial sum.

Y = T - aΣ x/(1+b)^i

Where the partial sum (Σ) is from i=1 to n and varies for each record between 1 and 25. Basically all of the terms of the equation are known and are in a single row of a table except for y. Each record has this single row of known terms.

I would like to add a column to the table for y using the data from that single row into this equation.

How do I get this partial sum to resolve? Is a For loop in the script my best option?

Many thanks,


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