|Estimating prey preference by predators: uses of various indices, and a proposal of another based on X2|Pearre, S. Jr. (1982). Estimating prey preference by predators: uses of various indices, and a proposal of another based on X2. Can. J. Fish. Aquat. Sci. 39(6): 914-923. hdl.handle.net/10.1139/f82-122
In: Canadian Journal of Fisheries and Aquatic Sciences = Journal canadien des sciences halieutiques et aquatiques. National Research Council Canada: Ottawa. ISSN 0706-652X; e-ISSN 1205-7533
selection, index, chi-square, exact test, prey
|Auteur|| || Top |
A really useful prey-selection index should be statistically testable. A 2 × 2 contingency table formulation provides a simple way to test the significance of any degree of selection at any sample size. An index ranging from -1 to +1, and zero-valued for no selection, can be simply derived from the chi-square formulation. Some conflicting usages in biological statistics texts are discussed, as well as the usefulness and limitations of other commonly used indices.