Discrimination Among Groups - UMass Amherst

Discrimination Among Groups P Are Groups significantly different? (How valid are the Groups ?). < Multivariate Analysis of Variance [(NP)MANOVA]. < Multi-Response Permutation Procedures [MRPP]. < Analysis of group Similarities [ANOSIM]. < Mantel's Test [MANTEL]. P How do Groups differ? (Which variables best distinguish Among the Groups ?). < Discriminant Analysis [DA]. < Classification and Regression Trees [CART]. < Logistic Regression [LR]. < Indicator Species Analysis [ISA]. 1. Important Characteristics of Discriminant Analysis P Essentially a single technique consisting of a couple of closely related procedures. P Operates on data sets for which pre-specified, well- defined Groups already exist. P Assesses dependent relationships between one set of discriminating variables and a single grouping variable; an attempt is made to define the relationship between independent and dependent variables.

3 PExtracts dominant, underlying gradients of variation (canonical functions) among gr oups of sample entities (e.g., species, sites, observations, etc.) from a set of ...

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