In my recent quest to create or catalog as many DAX equivalents for Excel functions, EFFECT was a cinch:
EFFECT =
POWER(
(1 + [Nominal_rate Value] / [Npery Value]),
[Npery Value]
) - 1
And via Algebra, NOMINAL:
NOMINAL =
VAR __Effect =[EFFECT]
VAR __Npery = [Npery Value]
RETURN
( POWER(__Effect+1,1/__Npery) - 1) * __Npery
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