On the dimensionalities of the dissociative experiences scale (DES) and the dissociation questionnaire (DIS-Q)

The dimensionalities of the Dissociative Experiences Scale (DES) and the Dissociation Questionnaire (DIS-Q) have been explored by factor analysis by a number of investigators. The general claim is that both scales are multidimensional. However, we argue that, in both cases, this apparent multidimensionality is a form of range restriction that arises because some symptoms are more common than other symptoms. As a result, the resulting subscales derived from the multifactor solutions are so highly intercorrelated as to be incapable of meaningful discriminant validity. The current findings support a more parsimonious single factor solution for both scales.