Recursion [PREV]

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my first time posting to this board. i couldn’t find when i quickly search recursion but is there a way to write a recursion formula with [PREV] for two years ago rather than only one? thanks

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the answer is [PREV-n] n being the number of years minus 1 you want to go back.
if the year is 2015 and I want to go back 2 years to 2013 it would be [prev-1].

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