1991 Volume 18 Issue 2 Pages 9-23
We propose a diagnostic method of rectangular closure by which we replace a Japanese character to provide a metric frame for quantization of Japanese handwriting. Based on Completeness and Independence of diagnostic variables, we formulate a diagnostic theory of handwriting for computerized graphology as a multivariate statistical analysis. Applications of the method to232Japanese hands revealed that27diagnostic variables defined on the metric frame were hierarchically classified into8clusters and condensed into8principal components, and that several diagnostic variables and principal components showed developmental changes with skillfulness of handwriting. We discuss the relationship between the developmental law and the aesthetic factors which contribute to the beautifulness of a written document.