Abstract
A method for extracting the hierarchical structure of a body of information is described. The method uses factor analysis to extract the principal components of a multidimensional measurement space. The principal axis solution of the factor analysis is rotated, starting with the two factors having the largest eigenvalues, and in successive rotations, adding facors with the highest eigenvalue from the remaining unrotated factors. The results are then presented in graphic form. The method is called rotation to hierarchical structure (Rotohist) and uses a single computer run for the analysis.