OBJECTIVE To test the Work Ability House model, verifying the hierarchy of proposed dimensions, among a group of hospital workers. METHODS A cohort study (2009-2011) was conducted with a sample of 599 workers from a hospital in the city of São Paulo. A questionnaire including sociodemographics, lifestyle and working conditions was used. The Brazilian versions of Job Stress Scale, Effort-Rewar...

A new algorithm for testing satis ability of propositional formulas in conjunctive normal form (CNF) is described. It applies reasoning in the form of certain resolution operations, and identi cation of equivalent literals. Resolution produces growth in the size of the formula, but within a global quadratic bound; most previous methods avoid operations that produce any growth, and generally do ...

Methods for testing hypotheses concerning the regression parameters in linear models for the latent person parameters in item response models are presented. Three tests are outlined: A likelihood ratio test, a Lagrange multiplier test and a Wald test. The tests are derived in a marginal maximum likelihood framework. They are explicitly formulated for the 3-parameter logistic model, but it is sh...

This paper examines the development of personnel selection testing from the late 19th century to the present, emphasizing general cognitive ability and personality testing. The development of methods and standards in employment testing is examined with particular emphasis on selection validity and utility. The issues of fairness and discrimination in cognitive ability selection testing are expl...

The Virtual Reality Applications Research Team (VIRART) has been developing communication and experiential Virtual Learning Environments (VLEs) for people with learning disabilities since 1991. As a human-factors-based research group, we have always been aware of usability issues and the importance of consideration of user needs and abilities in any design development process. However, the infa...

1. Introduction This essay is an exploratory study of incentives with two-dimensional output. I consider a model in which workers allocate effort across two dimensions: quality and quantity. The monitor can observe quantity perfectly and without cost. While quality comes in divisible units, I assume that observable quality comes in two forms: normal and distinguished. If quality meets a fixed s...