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  1. Z

    Normality of the data in linear regression

    We have a data structure with 11 columns: 3 species and 8 chemical-physical indicators of water quality. However, two of the species are zooplankton well known for their use as biological indicators of water quality. That's why it seemed likely that we have only one variable (zebra mussel...
  2. Z

    How to interpret my CCA triplot?

    How to interpret my CCA triplot? I have a CCA triplot of taxa/ samples over 8 environmental gradients and am trying to make sense of the result. First, different theory sources all state that clustering of samples around the far end of an arrow representing an environmental gradient suggests...
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    The length of explanatory vectors in CCA and their relation to impact on (explained) variance

    I performed CCA on a taxa-sample matrix using 8 explanatory variables. They say that the length of the vectors that represent the explanatory variables in your triplot visualization is proportional to their impact on the taxonomic variance. However, since various of my explanatory variables have...
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    Canonical Correspondence Analysis: how to interpret results

    Hi, I am using Canonical Correspondence Analysis (CCA) to analyze phytolith abundances (similar to pollen) over environmental gradients. As I am new to CCA, I read some background info. The following section from explains how to look at the visualization of results (Buttigieg & Ramette, 2014)...