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I think you inversed the relationship. Multiple R is the correlation between actual and predicted values of the dependant variable. R2 is the modelâs accuracy in explaining the dependant variable. I think there is a testable difference.
MIRR formula. where: 1  NPV() is the Excel NPV function. 2  rrate is the reinvestment rate. 3  frate is the finance rate. 4  values[positive] is the positive values in the array only. 5  values[negative] is the negative values in the array only. 6  n is the number of periods.