Successive intervals scaling of paired comparisons

In this paper a method is developed for analyzing data resulting from the use of a modification of the usual paired comparisons procedure which allows for ratings of size of difference. The scaling model is essentially an extension of the Thurstonian successive intervals model. The method is applied to scaling of a set of nine immoral actions and the results agree rather well with those from conventional successive intervals scaling of the same stimuli.This study was supported by a grant from the Swedish Council for Social Science Research.