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Just a note

Take care - many texts have an error in this formula, apparently because of a typographical error in Southwood, 2000 (Southwood, T.R.E. & Henderson, P.A. (2000). Ecological Methods 3rd Edn. Blackwell, Oxford. 575 pp.) which gives it on p12 as:
1 - 1
2b
rather than
1 - b
2

We assume Southwood originally wrote it as 1 - 1/2b