Differential test functioning, or DTF, occurs when one or more items in a test demonstrate differential item functioning (DIF) and the aggregate of these effects are witnessed at the test level. In many applications, DTF can be more important than DIF when the overall effects of DIF at the test level can be quantified. However, optimal statistical…

We surveyed researchers in the health and exercise sciences to explore different areas and magnitudes of bias in researchers' decision making. Participants were presented with scenarios (testing a central hypothesis with p = 0.06 or p = 0.04) in a random order and surveyed about what they would do in each scenario. Participants showed significant…

The testing of contemporary sociological theory often calls for the application of structural-equation models to data which are inherently collinear. It is shown that simple ridge regression, which is commonly used for controlling the instability of ordinary least squares regression estimates in ill-conditioned data sets, is not a legitimate…

The fifth of a series of brief reports on the study of mental retardation in a Canadian province covers a period of approximately one year (September, 1969, through November, 1970). The period under review is primarily one of data gathering with the emphasis on the adequacy of the sampling procedure, follow up of incomplete interviews, and tapping…

Research on assessing the cultural fairness of individual test items is reviewed, with emphasis on Birnbaum's three-parameter logistic model. As defined in this review, differential item characteristics are exhibited when examinees from one group have a lower probability of answering correctly than do examinees of equal ability from another group.…

Mental health consumer-run organizations are alternatives to mainstream mental health services, and they have the dual focus of supporting members and creating systems change. The existing literature suggests that these organizations have beneficial impacts on social support, community integration, personal empowerment, subjective quality of life,…