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en:expl_var_r [2019/02/10 16:07]
David Zelený
en:expl_var_r [2019/02/10 16:19]
David Zelený [Explained variation and Monte Carlo permutation test (constrained ordination)]
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 [[{|width: 7em; background-color:​ white; color: navy}expl_var_exercise|Exercise {{::​lock-icon.png?​nolink|}}]] [[{|width: 7em; background-color:​ white; color: navy}expl_var_exercise|Exercise {{::​lock-icon.png?​nolink|}}]]
  
 +==== R functions ====
 +
 +  * **''​RsquareAdj''​** (library ''​vegan''​) - extracts the value of R<​sup>​2</​sup>​ and adjusted R<​sup>​2</​sup>​ from results of ordination (and also regression). For linear constrained ordinations (RDA, tb-RDA), the adjusted R2 is calculated using Ezekiel'​s formula, while for unimodal constrained ordinations (CCA) the calculation is based on permutation model introduced by [[en:​references|Peres-Neto et al. (2006)]].
   * **''​anova.cca''​** (library ''​vegan''​) - tests the significance of the variation in species composition explained by explanatory variables in constrained ordination (RDA, CCA), using Monte Carlo permutation test. It can test the significance of    * **''​anova.cca''​** (library ''​vegan''​) - tests the significance of the variation in species composition explained by explanatory variables in constrained ordination (RDA, CCA), using Monte Carlo permutation test. It can test the significance of 
     * the global model (default setting), i.e. all variables included in the analysis;     * the global model (default setting), i.e. all variables included in the analysis;
en/expl_var_r.txt · Last modified: 2019/02/26 23:35 by David Zelený