Réponse
The mca action reduces the dimensionality of nominal variables by using a multiple correspondence analysis (MCA).
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mca
nominalVarsDimReduction
Other questions about mca
How do I specify the number of new variables to be created?
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Is it possible to add a custom prefix to the names of the output reduced variables?
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Which parameter is used to define the input table for the analysis?
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How can I specify which variables are nominal for the training?
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How can I save the dimensionality reduction model for future scoring?
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