Formula reference—Lincoln index and Simpson diversity

Use N=(n₁×n₂)/m₂ for mark-release-recapture and the stated Simpson formula for diversity.

Define each sample count and check that the formula version matches the convention in the question.

If few marked animals are recaptured, the estimate can become very large and uncertain.

Never interpret Simpson’s direction without checking whether the formula is D, 1−D or a reciprocal form.