Within SAM , a program called SAMITPRO was developed that can do an Analysis of Variance (ANOVA), cf. Chapter 9, on the test results scored by SAM_SCORE . The technique used is called ``iterative proportional fitting''. The goodness of the fit is expressed by Pearson's . The input of the analysis program is DBMS format. For availability, see Appendix E.
Based on the confusion matrix, a multidimensional scaling analysis can be performed. For this purpose, the confusion matrix has to be transformed to a symmetric matrix (i.e. ), and analysed by multidimensional scaling analysis (HDSCAL ) such as developed by [Carroll & Chang (1970)]. Examples of this procedure can be found in [Steeneken (1989)].