On generalized least squares estimation of the weibull distribution

A simple estimation procedure, based on the generalized least squares method, for the parameters of the Weibull distribution is described and investigated. Through a simulation study, this estimation technique is compared with maximum likelihood estimation, ordinary least squares estimation, and Menon's estimation procedure; this comparison is based on observed relative efficiencies (that is, the ratio of the Cramer-Rao lower bound to the observed mean squared error). Simulation results are presented for samples of size 25. Among the estimators considered in this simulation study, the generalized least squares estimator was found to be the "best" estimator for the shape parameter and a close competitor to the maximum likelihood estimator of the scale parameter.     

Book reviews

This article examines nationalist impulses toward a familiar, traditional heteronormativity through the language and imagery of a sample of tabloid newspapers in Britain during the Falklands War in 1982. In doing so, it asks how tabloid representation of the war created a particular and normative version of ‘Britishness’, central to which was the English woman, whose body became the site for a specific coalescing of race, gender and sexuality; a fixed notion of whiteness and normative heterosexuality located in the particular, unstable cultural space of a struggling ‘post-colonial’ Britain.     

The Benefits and Costs of New Fuels and Engines for Light‐Duty Vehicles in the United States

Rising oil prices and concerns about energy security and climate change are spurring reconsideration of both automobile propulsion systems and the fuels that supply energy to them. In addition to the gasoline internal combustion engine, recent years have seen alternatives develop in the automotive marketplace. Currently, hybrid‐electric vehicles, advanced diesels, and flex‐fuel vehicles running on a high percentage mixture of ethanol and gasoline (E85) are appearing at auto shows and in driveways. We conduct a rigorous benefit‐cost analysis from both the private and societal perspective of the marginal benefits and costs of each technology—using the conventional gasoline engine as a baseline. The private perspective considers only those factors that influence the decisions of individual consumers, while the societal perspective accounts for environmental, energy, and congestion externalities as well. Our analysis illustrates that both hybrids and diesels show promise for particular light‐duty applications (sport utility vehicles and pickup trucks), but that vehicles running continuously on E85 consistently have greater costs than benefits. The results for diesels were particularly robust over a wide range of sensitivity analyses. The results from the societal analysis are qualitatively similar to the private analysis, demonstrating that the most relevant factors to the benefit‐cost calculations are the factors that drive the individual consumer's decision. We conclude with a brief discussion of marketplace and public policy trends that will both illustrate and influence the relative adoption of these alternative technologies in the United States in the coming decade.     

A critical survey on the status of multiple criteria decision making theory and practice

This paper seeks to review and to contrast the main streams of thought in Multiple Criteria Decision Making (MCDM) theory and practice, without attempting to review all MCDM methods in detail. The main purpose is to identify pitfalls in the usage of various approaches, and to suggest approaches which are most robustly and effectively useable, especially by the non-expert in MCDM methodology. Problem areas in MCDM still requiring further research are also discussed.     

Reactions to a partner-assisted emotional disclosure intervention: direct observation and self-report of patient and partner communication

Partner-assisted emotional disclosure is a couple-based intervention designed to help patients disclose cancer-related concerns to their spouses-partners. We previously found that, compared with an education/support control condition, partner-assisted emotional disclosure led to significant improvements in relationship quality and intimacy for couples in which the patient initially reported holding back from discussing cancer-related concerns (Porter et al., 2009, Cancer, 115, 4326-4338). The purpose of this study was to examine the process data from couples who participated in the disclosure sessions including (a) observational ratings of couples' communication during the sessions; (b) couples' ratings of their communication during the sessions; and (c) associations between participants' observed communication and their baseline psychological/relationship functioning. As rated by trained observers, couples' communication was in the moderate range of adaptive skills. Self-report data indicated that participants had positive perceptions of their communication. Observational and self-report ratings were weakly associated. Patients reporting lower levels of relationship quality, higher levels of holding back, and higher partner avoidance at baseline were rated by observers as more expressive during the sessions. Overall, these findings suggest that the intervention was acceptable to couples and was particularly helpful for patients who had difficulty talking with their partners on their own without skills training.     

Patient-centered approach to building problem solving skills among older primary care patients: problems identified and resolved

This article describes problems identified by older primary care patients enrolled in Problem Solving Therapy (PST), and explores factors associated with successful problem resolution. PST patients received 1 to 8, 45-min sessions with a social worker. Patients identified problems in their lives and directed the focus of subsequent sessions as consistent with the steps of PST. The 107 patients identified 568 problems, 59% of which were resolved. Most commonly identified problems included health related issues such as need for exercise or weight loss activities, medical care and medical equipment needs, home and garden maintenance, and gathering information on their medical condition. Problems identified by patients were 2.2 times more likely to be solved than those identified by a health care professional. Using PST in primary care may facilitate patients in addressing key health and wellness issues.     

Preventive planning for disasters

The authors have analysed the available data on disaster occurence and conclude that disasters are on the increase, especially in underdeveloped countries. They argue that a new approach to disaster is needed, one which emphasizes the continuing man-environment relationship. Within this approach, planning to prevent disaster should concentrate on long-term precautionary planning integrated into development planning utilizing, as far as possible, local awareness of the disaster problem. This long-term approach to disaster planning is a more effective way of offsetting disaster than a heavy emphasis on each individual disaster event and the relief measures which accompany it.     

Rates of Asymptomatic Nonurethral Gonorrhea and Chlamydia in a Population of University Men Who Have Sex With Men

ABSTRACT

Objective: To evaluate a text message (SMS) program as a booster to an in-person alcohol intervention with mandated college students. Participants: Undergraduates (N = 224; 46% female) who violated an on-campus alcohol policy over a 2-semester period in 2014. Methods: The SMS program sent drinking-related queries each Thursday and Sunday and provided tailored feedback for 6 weeks. Response rates to SMS drinking-related queries and the associations between weekend drinking plans, drinking-limit goal commitment, and alcohol consumption were examined. Gender differences were explored. Results: Ninety percent of SMS queries were completed. Weekend binge drinking decreased over 6 weeks, and drinking-limit goal commitment was associated with less alcohol consumption. Compared with women, men had greater reductions in alcohol consumption when they committed to a drinking-limit goal. Conclusions: Preliminary evidence suggests that an SMS program could be useful as a booster for helping mandated students reduce weekend binge drinking.     

Factors Predicting Relocation Among Older Adults

Having a greater understanding of what influences the older adults decisions to move and the characteristics of older adults who are more likely to move is valuable to help plan for the housing needs of the expanding older adult population. The authors examined how contextual, push and pull factors influence preferences of older adults to relocate. A total of 1,015 community-dwelling older adults completed a survey. Results of logistic regression analysis indicated the following variables as significantly related to relocation: gender, age, household income, province resided in, driving status, whether the current home met the older adult's needs, and unmet heavy cleaning needs. Policies and services need to focus on identification of those at most risk of relocation and support them either in their preference to age in place or through the relocation process.