Calculate geometric mean in Excel

Posted by Libby on Super User See other posts from Super User or by Libby
Published on 2012-11-28T18:34:12Z Indexed on 2012/11/29 17:08 UTC
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I have some email network data in Excel as a edgelist meaning I have columns Vertex1, Vertex2, and then N columns of properties of that edge like how many emails were sent from one person to another. For each row in the data, Vertex1 is the source of a message, and Vertex2 is the target, so edges are directed. Here's some sample data

Vertex1 Vertex2 nMessages
Bob     Cindy   12
Cindy   Bob     3
Bob     Mike    11
Cindy   Mike    1

I'm trying to calculate a geometric mean of the form

gm = sqrt[(# of edges ij)*(# of edges ji)]

So gm for Bob and Cindy is gm = sqrt[(messages from Bob to Cindy)*(messages from Cindy to Bob)] or sqrt(12*3) = 6. Is there a way to make that a formula in Excel?

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