Robust Clustering on Rules Usage Classification of OJT with Raw Rule Score

The purpose of this study is to analyze the rule usage of OJT by a robust clustering, called similarity- based clustering method (SCM) proposed by Yang and Wu (2004), with raw rule score. The clustering result of SCM indicates that five groups are the best classifications of rule usage. Each group represents one rule or mixture of rules with which fits the theoretic foundation of rule usage of OJT. It also shows that patterns of rule usage vary with different grade of subjects, but not with gender.