Abstract
We present an alternative approach to Multiple Correspondence Analysis (MCA) that is appropriate when the data consist of ordered categorical variables. MCA displays objects (individuals, units) and variables as individual points and sets of category points in a low-dimensional space. We propose a hybrid decomposition on the basis of the classical indicator super-matrix, using the singular value decomposition, and the bivariate moment decomposition by orthogonal polynomials. When compared to standard MCA, the hybrid decomposition will give the same representation of the categories of the variables, but additionally, we obtain a clear association interpretation among the categories in terms of linear, quadratic and higher order components. Moreover, the graphical display of the individual units will show an automatic clustering.
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Ordered multiple correspondence analysis has been programmed by the first author in R. Any request of the program can be done writing to the address below.
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Lombardo, R., Meulman, J.J. Multiple Correspondence Analysis via Polynomial Transformations of Ordered Categorical Variables. J Classif 27, 191–210 (2010). https://doi.org/10.1007/s00357-010-9056-6
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DOI: https://doi.org/10.1007/s00357-010-9056-6