ASSESSING THE DIMENSIONALITY OF OPTIMISM AND PESSIMISM USING A MULTIMEASURE APPROACH

Weighted least-squares confirmatory factor analysis and exploratory fa ctor-analytic procedures were used to assess the dimensionality of thr ee self-report instruments designed to measure optimism and pessimism: the Life Orientation Test (LOT), the Hopelessness Scale (HS), and the Optimism and Pessimism Scale (OPS). The LOT was found to be bidimensi onal, the HS unidimensional, and the OPS multidimensional. The HS was interpreted as measuring a unipolar pessimism dimension. Factor analys es performed on an item subset from the OPS that fit the definition of optimism and pessimism as generalized outcome expectancies also suppo rted the two-dimensional model of optimism and pessimism. Differential correlations between separate optimism and pessimism indices and a me asure of psychological stress provided partial further support for a t wo-dimensional model of optimism and pessimism.