Benjamin/Cummings, 1999 - Science - 620 pages
This coherent text translates the methods of statisticians into "ecological English" so that students may readily apply these methods to the real world. Ecological Methodology, Second Edition provides a balance of material on animal and plant populations. It teaches students of ecology how to design the most efficient tests in order to obtain maximum precision with minimal work. The first part of the text focuses on biological and technical issues in statistical methodology. Students learn about advances that have been made in designing better sampling devices, along with the techniques and equipment used for sampling. The second part deals with creating solid statistical design, and presents all methods that are well-known to statisticians in a language and context that students will easily understand.
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Tests for Goodness-of-Fit There are two methods for testing the goodness-of-fit of
the Poisson distribution: the index of dispersion test and the chi-squared
goodness-of-fit test. Index of Dispersion Test. We define an index of dispersion I
to be ...
6.4.4 Morisita's Index of Dispersion Morisita (1962) developed an index of
dispersion that has some of the desirable attributes of an index: X x2 — X x I , = n
| — - d "|####| (6.19) where Ia = Morisita's index of dispersion n = Sample size 2 x
It is important to remember when sampling with quadrats that the spatial pattern
obtained, and the resulting index of dispersion, depends on quadrat size and
shape. Elliott (1977) shows this graphically for a population with a clumped