Direct gradient analysis
9 important questions on Direct gradient analysis
What is the goal of direct ordination?
What is the constrained version of PCA?
What is the constrained version of CA?
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Which 2 ordinations are done in constrained ordination?
- one on the modelled(constrained) part
- one on the residual (unconstrained) part.
Both parts are necessarily smallerthan the total variation in species abundances!
What is ignored during the calculation of the constrained eigenvalues?
This is why the first unconstrained eigenvalue may jump in magnitude.
What tests can be done on a constrained model?
- Testing the overall significance of the model
- Testing individual model terms sequentially
- The marginal effect of a single variable
- Testing constrained (canonical) axes
What is test 3 (marginal tests)?
- Tested by eliminating each term from the model containing all other terms
- The marginal effects are independent of the order of the terms, but correlated terms will get higher p-values
What is test 4 (test of canonical axes)?
- The second axis is tested after partialling out the first axis
- The third axis is tested after partialling out the first and second axis
- ... and so on
How is the pseudo-F-value calculated?
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