In regression analysis, the notion of population validity is of theoretical interest for describing the usefulness of the underlying regression model, whereas the presumably more important concept of population cross-validity represents the predictive effectiveness for the regression equation in future research. It appears that the inference…

A theoretical advantage of item response theory (IRT) models is that trait estimates based on these models provide more test information than any other type of test score. It is still unclear, however, whether using IRT trait estimates improves external validity results in comparison with the results that can be obtained by using simple raw…

This paper partly revises the dynamic equilibrium (DE) theory of subjective well-being (SWB), sometimes termed set point theory. Results from four national panel surveys show that correlations among measures of SWB diminish over time, and that the SWB set points of a minority of individuals substantially change. These results mean that DE theory…

This article examines the job attitudes of people who hold more than one job. Satisfaction, stress, and organizational (continuance and affective) commitment were assessed for both primary and secondary jobs for 83 full-time workers who held two jobs concurrently. Consistency between job constructs across jobs was negligible, except for…