Use of a case study in sequencing/scheduling research

This paper describes a study of an industrial sequencing/scheduling problem. The study contains the definition of the problem, data requirements and examination of solution technique. Definition of the problem is discussed from the aspect of uniqueness of the specific system. Discussion of data requirements includes availability and accuracy, while examination of solution technique considers limitation of time, computer capacity, etc., as well as the possibility of imbedding available algorithms into the solution procedure. Conclusions are presented relative to the use of the case study approach in sequencing/scheduling research.     

Human dynamics: A new approach to human behavior

This paper presents a new approach to analyze human behavior and more precisely human performance. It calls upon a system dynamics methodology to develop a general framework for looking at human beings. As an illustration of the approach, one subsystem is described. The global human system is also briefly presented. The contribution of such an approach is illustrated with an example dealing with the study of a worker performance subject to different types of control.     

Educating back-injured workers: What should we be teaching?

OBJECTIVE: The purpose of this study was to identify what information people with acute and chronic back pain, health care practitioners, employers and case managers felt should be included in an educational brochure for recently back-injured workers. STUDY DESIGN: Four focus groups were convened, each comprising several representatives from one of the four constituencies. Participants rated 32 information items regarding their inclusion in an educational brochure. Ratings were tabulated for ranking and for group comparisons. RESULTS: While consensus was strong for most information items, there were apparent differences between the groups for several items relating to work resumption, medical attention, and legal or compensation consultation. CONCLUSIONS: Perceived educational needs of back-injured workers may differ from those of their health care practitioners and from their employers or insurers. Future efforts to prevent back disability through education should include evaluation of the informational needs of injured workers.     

Subgroup analyses of clinical effectiveness to support health technology assessments

Subgroup analysis is an integral part of access and reimbursement dossiers, in particular health technology assessment (HTA), and their HTA recommendations are often limited to subpopulations. HTA recommendations for subpopulations are not always clear and without controversies. In this paper, we review several HTA guidelines regarding subgroup analyses. We describe good statistical principles for subgroup analyses of clinical effectiveness to support HTAs and include case examples where HTA recommendations were given to subpopulations only. Unlike regulatory submissions, pharmaceutical statisticians in most companies have had limited involvement in the planning, design and preparation of HTA/payers submissions. We hope to change this by highlighting how pharmaceutical statisticians should contribute to payers' submissions. This includes early engagement in reimbursement strategy discussions to influence the design, analysis and interpretation of phase III randomized clinical trials as well as meta-analyses/network meta-analyses. The focus on this paper is on subgroup analyses relating to clinical effectiveness as we believe this is the first key step of statistical involvement and influence in the preparation of HTA and reimbursement submissions.     

Perceived consequences of hazing exposure during the first year of college: Associations with childhood victimization

Objective: This study investigates the association between histories of childhood victimization and perceived consequences of college hazing. Participants: First-year college students at four US universities (N?=?120). Method: Participants completed Web-based surveys asking about childhood victimization (eg, child maltreatment), peer victimization, and perceived consequences of hazing during college. Results: Results indicated that college students with childhood victimization histories perceived hazing to be negative. In particular, physical dating violence and a greater total number of childhood victimization exposures were related to a higher number of perceived negative consequences. Conclusion: Past victimization exposures confer risk on college students who experience hazing, in that these students are more likely to perceive negative consequences of hazing. Hazing-related policies and outreach efforts should consider these potential negative consequences, and counselors should be aware of the link between past victimization and how hazing might be experienced.     

What's an Oscar worth?

This article examines the impact of an Academy Award nomination and award for best picture, best actor/actress, and best supporting actor/actress on a film's (i) market share of theaters, (ii) average revenue per screen, and (iii) its probability of survival. The model is estimated using weekly box-office data for a matched sample of nominated and non-nominated films. The results indicate substantial financial benefits for a nomination and award for best picture and best actor/actress. The structure of rewards is consistent with that found in two-stage, single-elimination tournaments.     

Spouse selection and earnings: evidence of marital sorting

This article investigates economic bases for individuals'selection of marriage partners. Its central focus is matching of spouse pairs based on unobservable components of hourly earnings. Using a data extract from the Panel Study of Income Dynamics, we have observations of individuals'wages before and immediately after marriage, along with their spouses'earnings after marriage. We exploit the data to estimate the relation between spouses'wage residuals. The evidence supports positive marital matching on the basis of earnings. The results are robust with respect to variations in the statistical framework of the model.