Shizuhiko Nishisato

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One of the most contentious issues in medical and legal practice is how to reliably assess the mental competence of individuals who consent or refuse psychiatric treatment. Current legislation does not provide clear definitions of what constitutes competence or incompetence to make a treatment decision. As a preliminary attempt to operationalize the concept(More)
A formulation, which is different from Guttman’s is presented. The two formulations are both called the optimal scaling approach, and are proven to provide identical scale values. The proposed formulation has at least two advantages over Guttman’s. Namely, (i) the former serves to clarify close relations of the optimal scaling approach to those of Slater(More)
OBJECTIVE To compare physicians' judgements of competency in routine clinical practice with the findings obtained from a structured clinical interview. METHODS Ninety-six patients referred for electroconvulsive therapy were administered the Competency Interview Schedule (CIS) prior to their first treatment. Cluster analysis was employed to categorize(More)
In most multidimensional analyses, the dimension reduction is a key concept and reduced space analysis is routinely used. Contrary to this traditional approach, total information analysis (TIA) (Nishisato and Clavel, Behaviormetrika 37:15–32, 2010) places its focal point on tapping every piece of information in data. The present paper is to demonstrate that(More)
For monotone, dichotomous items, two interpretations of the usual scoring procedure may be made. One interpretation (A) is that failure of the items to form a perfect Guttman Scale leads to loss of discriminative infor- mation when the usual procedure of scoring is applied. Another interpretation (B) is that nonunidimensionality of the item-set leads to(More)
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