Combinatorial Inference in Geometric Data Analysis
Résumé
Combinatorial Inference in Geometric Data Analysis
In this talk, we present statistical inference methods for Geometric Data Analysis (GDA) that are not based on random modeling, but on permutation procedures recast in a combinatorial framework. The combinatorial approach, which is entirely free from assumptions, is the most in harmony with inductive data analysis. The methods are applicable to any IndividualsXvariables table, with structuring factors on individuals (i.e. external categorical variables not used for construction the clouds), and either numerical (PCA) or categorized (MCA) variables. In GDA the usual sampling models, with their drastic assumptions, are simply not appropriate.
We first introduce the test of comparison of the mean of a subcloud to a point a reference. Then we develop procedures dealing with the typicality of a subcloud of individuals with a generalization of test-values. Lastly, we present homogeneity tests for comparing several subclouds. In each case, we define the p-value and a compatibility (confidence) zone.
References:
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