[The configuration frequency analysis. Victor's singular types and syndromes]

A new concept on configural frequency analysis (CFA) is presented under the title: CFA, Victor's singular types and syndromes. The new concept is suitable and highly effective if one and only one type, a singular type, is present within a population of subjects or patients. It is based on the nullhypothesis of quasi-independence which assumes that a type-population with coincident variables is superimposed to a residual population with independent variables. The singular type CFA is illustrated by a set of data where a subgroup of dyslexics is mixed up with a residual group of non-dyslexics who have been evaluated as to reading, vocabulary and spelling. The resulting type, not to be identified by classical CFA, was shown to be singular and clear-cut with weakness in all 3 verbal tests. The importance of singular types and syndromes for psychopathology is discussed clinically and theoretically.