Thread: Shannon diversity index formula
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Barb Reinhardt Barb Reinhardt is offline
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Default Shannon diversity index formula
Try this then:

=-SUMPRODUCT((C$2:C$20/SUM(C$2:C$20)),(IF(C$2:C$200,(LOG(C$2:C$20/SUM(C$2:C$20))))))
Activate with CTRL SHIFT ENTER
You should see {} around the formula when you are done.

"peter" wrote:

This function still evaluates to a #NUM error.

On Apr 8, 2:22 pm, Barb Reinhardt
wrote:
Try this

=-SUMPRODUCT(--(C2:C200),(C2:C20/SUM(C2:C20)),(LOG(C2:C20/SUM(C2:C20))))



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