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Hi Ken, could you please clarify the subscript in the function effecting the years variable being “a” (applied to the aptitude unobserved variable) instead of “y”? And in the next example a subscript “a” instead of “e” (explanatory) and “i” instead of “o” (outcome)? And using the same function subscript “r” (and asume the same function) to be applied to the marketing spend, buyers and sellers variables? Is that relevant? I guess I am missing something.

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