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# Difference between revisions of "Simpson"

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(New page: '''''*simpson*''''' These files give the classic Simpson Index of diversity. <math>H_{Simpson} = \frac {\sum_{i=1}^{S_{obs}} {S_i \left ( S_i - 1 \right )}}{N \left( N-1 \right )}</ma...) |
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These files give the classic Simpson Index of diversity. | These files give the classic Simpson Index of diversity. |

## Revision as of 16:06, 14 January 2009

Validate output by making calculations by hand

***.simpson**

These files give the classic Simpson Index of diversity.

<math>H_{Simpson} = \frac {\sum_{i=1}^{S_{obs}} {S_i \left ( S_i - 1 \right )}}{N \left( N-1 \right )}</math>

For the Amazonian dataset, the Simpson Index is 0.0044.

Example calculations below will be performed using data from the 70.fn.shared file with an OTU definition of 0.03.