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I'm having great difficulty building a series with interest rate r where I need the product from i=1 to t of ( 1+r_i ).
Using the comment @prod(x) gives just the total product of the whole series and not a new series where the entry at time t equals the product of the previous entries.
Could anyone help me out with this?
Thanks

You need the cumulative product? Take logs, use the cumulative sum, then exponentiate the result.

Something like:

Thanks!