Endowment additivity and the weighted proportional rules for adjudicating conflicting claims

We propose and study a new axiom, restricted endowment additivity, for the problem of adjudicating conflicting claims. This axiom requires that awards be additively decomposable with respect to the endowment whenever no agent’s claim is filled. For two-claimant problems, restricted endowment additivity essentially characterizes weighted extensions of the proportional rule. With additional agents, however, the axiom is satisfied by a great variety of rules. Further imposing versions of continuity and consistency, we characterize a new family of rules which generalize the proportional rule. Defined by a priority relation and a weighting function, each rule aims, as nearly as possible, to assign awards within each priority class in proportion to these weights. We also identify important subfamilies and obtain new characterizations of the constrained equal awards and proportional rules based on restricted endowment additivity

The Predictive Utility of Generalized Expected Utility Theories

Many alternative theories have been proposed to explain violations of expected utility (EU) theory observed in experiments. Several recent studies test some of these alternative theories against each other. Formal tests used to judge the theories usually count the number of responses consistent with the theory, ignoring systematic variation in responses that are inconsistent. We develop a maximum-likelihood estimation method which uses all the information in the data, creates test statistics that can be aggregated across studies, and enables one to judge the predictive utility-the fit and parsimony-of utility theories. Analyses of 23 data sets, using several thousand choices, suggest a menu of theories which sacrifice the least parsimony for the biggest improvement in fit. The menu is: mixed fanning, prospect theory, EU, and expected value. Which theories are best is highly sensitive to whether gambles in a pair have the same support (EU fits better) or not (EU fits poorly). Our method may have application to other domains in which various theories predict different subsets of choices (e.g., refinements of Nash equilibrium in noncooperative games)

Prospective randomized subject-masked study of intravitreal bevacizumab monotherapy versus dexamethasone implant monotherapy in the treatment of persistent diabetic macular edema

Purpose: To compare intravitreal bevacizumab monotherapy with intravitreal dexamethasone delayed delivery system monotherapy for persistent diabetic macular edema. Methods: Single-center, randomized, subject-masked study of eyes with persistent diabetic macular edema, defined as central subfield thickness (CST) >340 μm despite ≥3 anti–vascular endothelial growth factors injections within 5 months. The intravitreal bevacizumab monotherapy (n = 23 eyes) and delayed delivery system monotherapy (n = 27 eyes) groups received treatments q1month and q3months, respectively. Results: Baseline best-corrected visual acuity and CST were similar in the two groups. At Month 7, the mean final best-corrected visual acuity (mean ± SD) was 65 ± 16 letters (mean Snellen visual acuity 20/50) and 64 ± 11 letters (20/50) (P = 0.619), the mean change in best-corrected visual acuity was +5.6 ± 6.1 and +5.8 ± 7.6 letters (P = 0.785), the mean final CST was 471 ± 157 and 336 ± 89 μm (P = 0.001), and the mean change in CST was −13 ± 105 and −122 ± 120 μm (P = 0.005) in the intravitreal bevacizumab monotherapy and delayed delivery system monotherapy groups, respectively. The number of injections was 7.0 ± 0.2 and 2.7 ± 0.5 (P < 0.001) in the 2 groups. Conclusion: The two groups had similar best-corrected visual acuity gains. The delayed delivery system monotherapy group achieved a significantly greater reduction of CST compared with the intravitreal bevacizumab monotherapy group, with a q3month interval of treatment, and had no recurrent edema at any visit

Increased gravitational force reveals the mechanical, resonant nature of physiological tremor

Human physiological hand tremor has a resonant component. Proof of this is that its frequency can be modified by adding mass. However, adding mass also increases the load which must be supported. The necessary force requires muscular contraction which will change motor output and is likely to increase limb stiffness. The increased stiffness will partly offset the effect of the increased mass and this can lead to the erroneous conclusion that factors other than resonance are involved in determining tremor frequency. Using a human centrifuge to increase head-to-foot gravitational field strength, we were able to control for the increased effort by increasing force without changing mass. This revealed that the peak frequency of human hand tremor is 99% predictable on the basis of a resonant mechanism. We ask what, if anything, the peak frequency of physiological tremor can reveal about the operation of the nervous system.This work was funded by a BBSRC Industry Interchange Award to J.P.R.S. and R.F.R. C.J.O. was funded by BBSRC grant BB/I00579X/1. C.A.V. was funded by A∗Midex (Aix-Marseille Initiative of Excellence

Treatment for the homeless mentally ill

The effect of treatment on the homeless mentally ill was explored. Seventeen homeless individuals were screened with questionnaires to determine anxiety and depression (Krug, Laughlin, Scheiner, & Catell, 1976). One group included diagnosed mentally ill subjects, the other were non-diagnosed individuals. Both groups were tested upon admittance to either a treatment facility for homeless mentally ill persons or a community homeless shelter, respectively. They were again screened prior to discharge of either facility. Statistically, a rather significant difference was noted in the decrease of the diagnosed group’s anxiety level upon discharge. A similar, but less significant, statistical difference was also noted in the diagnosed group’s depression upon discharge, when they were compared to the non-diagnosed group. Clinically, these differences are important in that 40% of the diagnosed group’s anxiety was decreased, as was 30% of the individuals’ depression

The Repair of a Chronic Coxofemoral Luxation

A Cocker Spaniel dog was admitted to Stange Memorial Clinic having been referred to the college clinic by a neighboring practitioner. The dog was suffering from a chronic coxofemoral luxation and the referring practitioner requested the use of a Knowles Toggle Pin

Exploration of Factors Affecting Nurse Faculty Use or Resistance to Online Education

The substantial increase in online nursing program enrollment demands that nurse educators be adept in the delivery of online education; however, a significant challenge exists in how to deliver practice-based nursing education in the online environment. Teaching online requires a change in the traditional role of the educator accompanied by the effective use of online learning technologies. Some studies suggest that faculties remain pessimistic to online delivery of education and do not participate, yet few objectively examine variables that influence resistance or use. Included in this dissertation are two manuscripts. The first manuscript defines resistance and addresses prominent concerns associated with teaching online: technology skills and competencies, faculty preparation and training, workload, and quality. The second manuscript is a research study report that utilized multiple regression to test the Unified Theory of Acceptance and Use of Technology (UTAUT) among a population of 940 southern U.S. nurse educators. The study revealed several causal connections associated with nurse faculty use of online education. Experience, performance expectancy, social influence, attitude, voluntariness, anxiety, and facilitating conditions significantly contributed to the UTAUT model, explaining 36% (R2) of the variance in usage behavior. Effort expectancy and self-efficacy variables did not significantly contribute to the model