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2. Achen, C. H. Interpreting and Using Regression. Sage University Paper Series on Quantitative Applications in the Social Sciences 07–029. Beverly Hills, CA: Sage Publications, Inc., 1982.
3. Non-Deductive Inference;Ackerman,1966
4. The Analysis of Ordinal Categorical Data;Agresti,1984
5. Cluster Analysis;Aldendorfer,1984