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Selection: Dormann:CF [5 articles] 

Publications by author Dormann:CF.
 

Cross-validation strategies for data with temporal, spatial, hierarchical, or phylogenetic structure

  
Ecography, Vol. 40, No. 8. (1 August 2017), pp. 913-929, https://doi.org/10.1111/ecog.02881

Abstract

Ecological data often show temporal, spatial, hierarchical (random effects), or phylogenetic structure. Modern statistical approaches are increasingly accounting for such dependencies. However, when performing cross-validation, these structures are regularly ignored, resulting in serious underestimation of predictive error. One cause for the poor performance of uncorrected (random) cross-validation, noted often by modellers, are dependence structures in the data that persist as dependence structures in model residuals, violating the assumption of independence. Even more concerning, because often overlooked, is that structured data also ...

 

Effects of incorporating spatial autocorrelation into the analysis of species distribution data

  
Global Ecology and Biogeography, Vol. 16, No. 2. (March 2007), pp. 129-138, https://doi.org/10.1111/j.1466-8238.2006.00279.x

Abstract

[Aim]  Spatial autocorrelation (SAC) in data, i.e. the higher similarity of closer samples, is a common phenomenon in ecology. SAC is starting to be considered in the analysis of species distribution data, and over the last 10 years several studies have incorporated SAC into statistical models (here termed ‘spatial models’). Here, I address the question of whether incorporating SAC affects estimates of model coefficients and inference from statistical models. [Methods]  I review ecological studies that compare spatial and non-spatial models. [Results]  In all ...

 

Stacking species distribution models and adjusting bias by linking them to macroecological models

  
Global Ecology and Biogeography, Vol. 23, No. 1. (1 January 2014), pp. 99-112, https://doi.org/10.1111/geb.12102

Abstract

[Aim] Species distribution models (SDMs) are common tools in biogeography and conservation ecology. It has been repeatedly claimed that aggregated (stacked) SDMs (S-SDMs) will overestimate species richness. One recently suggested solution to this problem is to use macroecological models of species richness to constrain S-SDMs. Here, we examine current practice in the development of S-SDMs to identify methodological problems, provide tools to overcome these issues, and quantify the performance of correctly stacked S-SDMs alongside macroecological models. [Locations] Barents Sea, Europe and Dutch Wadden Sea. [Methods] We present formal mathematical arguments demonstrating how S-SDMs should ...

 

Collinearity: a review of methods to deal with it and a simulation study evaluating their performance

  
Ecography, Vol. 36, No. 1. (1 January 2013), pp. 27-46, https://doi.org/10.1111/j.1600-0587.2012.07348.x

Abstract

Collinearity refers to the non independence of predictor variables, usually in a regression-type analysis. It is a common feature of any descriptive ecological data set and can be a problem for parameter estimation because it inflates the variance of regression parameters and hence potentially leads to the wrong identification of relevant predictors in a statistical model. Collinearity is a severe problem when a model is trained on data from one region or time, and predicted to another with a different or ...

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A quantitative review of ecosystem service studies: approaches, shortcomings and the road ahead

  
Journal of Applied Ecology, Vol. 48, No. 3. (1 June 2011), pp. 630-636, https://doi.org/10.1111/j.1365-2664.2010.01952.x

Abstract

1. Ecosystem services are defined as the benefits that humans obtain from ecosystems. Employing the ecosystem service concept is intended to support the development of policies and instruments that integrate social, economic and ecological perspectives. In recent years, this concept has become the paradigm of ecosystem management. 2. The prolific use of the term ‘ecosystem services’ in scientific studies has given rise to concerns about its arbitrary application. A quantitative review of recent literature shows the diversity of approaches and uncovers a lack ...

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