A measurement model for the Schwartz values inventory is proposed that - aside from the traits measured - takes into account method factors as well as systematic effects of the situation of measurement and of person-situation interaction. The values inventory measures ten, nearly universally recognized motivational types of values. It was administered to 224 subjects on two occasions, six weeks apart. Traditional latent trait models and latent state-trait models with method factors were specified for each of the ten value-type scales and tested with Lisrel. The latent trait model was inadequate as a measurement model in all cases. For nine of the ten values scales, a latent state-trait model with method factors fit the data best. For one scale, a latent trait model with method factors was acceptable. Based on the accepted models and their parameter estimates, the reliabilities, trait consistencies, occasion specificities, and method specificities of the scales were determined. By far the largest proportion of variance in individual value priorities was due to trait differences. In addition, for nine value types, small but significant proportions of variance reflected systematic effects of the particular occasion of measurement. Finally, a substantial proportion of variance in the scales was traceable to methods effects.
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