Non-symmetrical correspondence analysis to evaluate how age influences the addiction discourses
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The current paper aims to present the method of Non-Symmetrical Correspondence Analysis (NSCA) based on Emerson’s orthogonal polynomials, which takes into account, in efficient way, the ordinal structure of the data. The extension of NSCA is the so called Singly Ordered Non-Symmetrical Correspondence Analysis version (SONSCA), that, by taking into account the ordinal structure in the table, improving the interpretation ability of the analysis. The methods was applied to 40 in-depth interviews, gathered with people in treatment for their problems with addiction. NSCA and SONSCA are used to evaluate if the classes of age of the subjects interviewed influence the addiction thematic categories that characterize their discourses.The work provides insight on NSCA and SONSCA methods and how they could be applied in the psychological context and in particular to study the dependence between ordinal and categorical variables reported in a contingency table.
keywordsNon-Symmetrical Correspondence Analysis (NSCA), Emerson’s Orthogonal Polynomials, Singly Ordered Non-Symmetrical Correspondence Analysis (SONSCA), Addiction Thematic Categories, Classes of Age. |
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