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Mass-dependent mass loss in breeding birds: getting the null hypothesis right
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolutionary Biology, Population Biology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolutionary Biology, Animal Ecology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolutionary Biology, Animal Ecology.
1999 (English)In: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 87, no 1, 191-194 p.Article in journal (Refereed) Published
Abstract [en]

An assumption central to many tests of statistical association between two variables is the null expectation of zero association. Here, we draw attention to the fact that in many published tests of mass-dependent mass loss in breeding birds, this assumption has been violated. We show that a correct null hypothesis can be derived by using resampling methods, and analyse three data sets (two previously published) from passerine birds to illustrate the approach. Our results show, that under a correct null hypothesis, the biological interpretation of the previously published results is reversed-initially heavy birds do actually lose less mass (relative to their weight) than the initially light birds.

Place, publisher, year, edition, pages
1999. Vol. 87, no 1, 191-194 p.
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Natural Sciences
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URN: urn:nbn:se:uu:diva-78071DOI: 10.2307/3547012OAI: oai:DiVA.org:uu-78071DiVA: diva2:105984
Available from: 2008-10-17 Created: 2008-10-17 Last updated: 2013-10-08Bibliographically approved

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