The Dispositional Hope Scale (DHS; C. R. Snyder et al., 1991) consists of two subsets of items measuring Agency and Pathways. The authors used bifactor analysis to evaluate the dimensionality structure of the scale. Data from 676 persons (295 psychiatric patients, 112 delinquents, and 269 students) were analyzed. The authors conclude that although the Pathway items seem to explain some additional variance when the Hope scale variance is partionalized out, the DHS allows unidimensional measurement.

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Abstract. Stark, Chernyshenko, Drasgow, and Williams (2006) and Chernyshenko, Stark, Drasgow, and Roberts (2007) suggested that unfolding item response theory (IRT) models are important alternatives to dominance IRT models to describe the response processes on self-report personality inventories. To obtain more insight into the structure of personality data, we investigated whether dominance or unfolding IRT models are a better description of the response processes on personality trait inventories constructed using dominance response processes or ideal-point response processes. Data from 866 adolescents on a Dutch personality inventory, the NPV-J ( Luteijn, van Dijk, & Barelds, 2005 ), and from 704 adolescents on a Dutch translation of an Order scale ( Chernyshenko et al., 2007 ) were used. Results from Stark et al. (2006) and Chernyshenko et al. (2007) were partly supported. The self-report inventory that was constructed using dominance response processes (NPV-J) consisted mostly of items with monotonically increasing item response functions (IRFs), but some IRFs were single-peaked. The Order scale (constructed on the basis of ideal-point response processes) consisted of items with monotonically increasing, decreasing, and single-peaked IRFs. Further implications for personality test construction are discussed.

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