Discovery algorithms for hierarchical relations

Two algorithms based on a latent class model are presented for discovering hierarchical relations that exist among a set ofK dichotomous items. The two algorithms, stepwise forward selection and backward elimination, incorporate statistical criteria for selecting (or deleting) 0–1 response pattern vectors to form the subset of the total possible 2 ^k vectors that uniquely describe the hierarchy. The performances of the algorithms are compared, using computer-constructed data, with those of three competing deterministic approaches based on ordering theory and the calculation of Phi/Phi-max coefficients. The discovery algorithms are also demonstrated on real data sets investigated in the literature.     

Reproductive Genetic Counseling to Asian-Pacific and Latin American Immigrants

Latin and Asian-Pacific immigrants are the fastest growing new-comer groups in the U.S. contributing to 85% of immigration totals. New immigrants experience multiple barriers to accessing genetic counseling resulting from cultural, linguistic, financial, and educational factors as well as having unique perceptions on health, illness, reproduction, and life as a whole. In addition, new immigrants lack familiarity with Western medical practices as well as genetic risk and available interventions. We provided perinatal genetic services to 2430 clients, mostly new immigrants of Latin and Asian-Pacific descent over a period of 6 years. Counseling aides sharing the clients' cultural backgrounds were employed. A study assessing the efficacy of cross-cultural education regarding advanced maternal age risk and amniocentesis was implemented and linked to a database containing demographic and clinical information. Practical observations relating to cultural beliefs in the two groups relevant to perinatal genetic counseling were made.     

A methodology to facilitate occupational task grouping: Meeting the demands of training analysis and planning

Methods for grouping occupational tasks are required to support a broad range of personnel actions and organizational planning activities. Having subject matter experts sort tasks into groups is the only methodology generally recognized for these purposes. For many applications, however, and training in particular, analyses that cover large areas of an organization may be required. For such uses, manual sorting is costly and may be infeasible. A new method, based on statistical clustering using task coperformance, is described. Results indicate that this method can replicate much of the structure of the experts’ groups and so can be used to facilitate task grouping. Implications of this new approach are discussed.     

A reevaluation of semantic versus nonsemantic processing in implicit memory

A number of investigations have purported to demonstrate that semantic processing does not produce a memorial advantage over nonsemantic processing on implicit tests, as contrasted with the typical advantage of semantic over nonsemantic processing on explicit tests. A review of 166 outcomes from 38 studies that have manipulated processing on implicit tests reveals that on 131 occasions (79%), priming was greater following semantic than it was following nonsemantic processing. This difference was found in both perceptual and conceptual implicit memory tests, as well as in within- and between-subjects designs. It suggests that implicit tests reflect the involvement of both conceptual and perceptual processes. Although explicit contamination may account for some of the processing difference in implicit tests, the pervasiveness of the phenomenon, especially in perceptual implicit tests, makes it an unlikely account for the entire effect.     

Personality correlates of life values

The present study sought to determine whether significant relationships exist between life value preferences and personality traits and to describe the nature of any relationships identified. Administered to 310 undergraduate and graduate students were the 16 PF personality inventory and a 55-item Life Values Inventory which assessed values governing life styles and orientations. A factor analysis of the Life Values Inventory resulted in the identification of 14 life values dimensions. Factor scores for these 14 dimensions were then employed in a canonical analysis and a factor analysis with the 16 PF scores. The canonical analysis yielded results significant at the .001 level. The factor analysis yielded 10 factors, many of which displayed shared common-factor variance between Life Values and 16 PF variables. The interpretation of that shared variance identified several personality correlates of life values that suggested causal and developmental interactions of some value in describing and explaining human behavior.     

Improving Self-Concept and Learning Skills of Marginal Black Students: A Seminar Approach

In this article, an eight-session seminar model is presented. This seminar is designed to increase participants' study skills and to redefine participants' self-concepts from those characterized by feelings of inadequacy and frustration to concepts of selves as competent and capable. Specific study skills content covers learning strategies, two-way communication, learning styles, note making, test taking, vocational planning, and academic coping strategies. This seminar model has been used to meet the above goals with considerable success; relevant data from the evaluation of a class taught using this model is included.