How do I type this so excel recognizes it?

[fronty]

I need to calculate the geometric average of returns on stocks.

I looked at the definition of geomean and it will not work for me. I
need to use this formula.

Rgeo={[(1+R1)(1+R2)....(1+Rn)]}^(1/n) -1

Any help would be greatly appreciated.

 

[Barb Reinhardt]

Add a helper column to calculate 1 + R1, 1+ R2, ETC.

Let's say that your data is in R1, R2, R3 to R10 for this example.
Create Q1-Q10
Q1:R1+1
Copy to Q10

Q11: =product(Q1:Q10)^(1/10)-1

 

[Dana DeLouis]

Hi. If v represents the Range A1:A10, then the following two Array Formulas
appear to work ok.

=POWER(PRODUCT(v+1),1/10)-1

=GEOMEAN(v+1)-1

Enter w/ Ctrl+Shift+Enter.