Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

Record number 423330
Title Improved testing of species traits-environment relationships in the fourth corner problem
Author(s) Braak, C.J.F. ter; Cormont, A.; Dray, S.
Source Ecology 93 (2012)7. - ISSN 0012-9658 - p. 1525 - 1526.
Department(s) Biometris (PPO/PRI)
Biometris (WU MAT)
Land Use Planning
Publication type Refereed Article in a scientific journal
Publication year 2012
Abstract The fourth corner problem entails estimation and statistical testing of the relationship between species traits and environmental variables from the analysis of three data tables. Dray and Legendre (2008, Ecology, 89, 3400-34) proposed and evaluated five permutation methods for statistical significance testing, including a new two-step testing procedure. However, none of these attained the correct type I error in all cases of interest. We solve this problem by showing that a small modification of their two-step procedure controls the type I error in all cases. The modification consists of adjusting the significance level from va to a or, equivalently, of reporting the maximum of the individual P-values as the final one. The test is also applicable to the three table ordination method RLQ
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