Simpsons Diversity Index

Step 2

Add up the total of all of the species you’ve counted.

Then fill in the n(n-1) column.

Species observedNumber of individuals
Field A (n)n(n-1)
Cocksfoot grass6060 x (60-1) = 3540
Timothy grass3232 x (32-1) = 992
Buttercup33 x (3-1) = 6
Clover33 x (3-1) = 6
Thistle11 x (1-1) = 0
Dandelion77 x (7-1) = 42
Total (N)106