Symmetry of functions and exchangeability of random variables

We present a new approach for measuring the degree of exchangeability of two continuous, identically distributed random variables or, equivalently, the degree of symmetry of their corresponding copula. While the opposite of exchangeability does not exist in probability theory, the contrary of symmetry is quite obvious from an analytical point of view. Therefore, leaving the framework of probability theory, we introduce a natural measure of symmetry for bivariate functions in an arbitrary normed function space. Restricted to the set of copulas this yields a general concept for measures of (non-)exchangeability of random variables. The fact that copulas are never antisymmetric leads to the notion of maximal degree of antisymmetry of copulas. We illustrate our approach by various norms on function spaces, most notably the Sobolev norm for copulas.     

MS,exercise, and the potential for older adults

Multiple Sclerosis (MS) is an autoimmune disorder of the central nervous system. The average onset of the disease is 30 years of age, and it afflicts women more often than men (ratio of approximately 2:1). The symptoms of the disease include fatigue, motor weakness, heat sensitivity, reduced mobility, abnormal gait mechanics, and poor balance. These symptoms decrease cognitive and physical functional capacity of an individual and tend to result in sedentary lifestyle behaviors. A sedentary lifestyle among individuals with MS increases the risk of secondary diseases such as coronary heart disease and obesity, particularly as one ages. The effect of exercise in treating symptoms of MS has been under explored, perhaps due to the fact that exercise was thought to magnify MS-related fatigue and other symptoms. Recent research has challenged this notion, advocating exercise as an effective therapy for the management of MS, as well as maintaining overall fitness and improving quality-of-life measures. While the research shows clear benefits, the barriers to exercise participation among MS patients are significant. Recommendations for various forms of exercise are provided, along with strategies for overcoming barriers to participation.     

Feedback in Organisationen

This article examines the need for and the problems of feedback in modern work organizations.The first part describes the way personal and institutional feedback is usually being delivered. It deals with the question why there seems to be an increasing need for feedback in modern organizations. In the second part a case study illustrates the dilemma between anonymity and direct communication. What makes anonymous feedback so disagreeable for the receiver and at the same time so difficult to transform into a more direct message? Finally, consultant malpractice in regard to feedback is being discussed.     

Problems of Measurement of the Relationship Between Civil Society and Democracy When Using Survey Data

Social Indicators Research - Over the last three decades, it has become accepted wisdom that membership in civil society organizations enhances civic participation and encourages democratic...     

Individual status at the start of rehabilitation: Implications for vocational rehabilitation programs

This research investigated the situation of 143 unemployed sick leavers at the start of vocational rehabilitation in Sweden. It is argued in this paper that in order to gain a meaningful picture of the vocational rehabilitation process it is necessary to know and understand something of individual differences and status at the onset. In doing so, assessment was carried out of the possible influence of one contextual factor and five individual factors on health, duration of sick leave and unemployment. Findings suggest that individual differences exist in health status, length of sick leave and unemployment, at the upstart of vocational rehabilitating. Locus of control was found to exert important influence on the differences between the individuals in the study sample, with persons of external locus of control having a less favourable point of departure at the start of vocational rehabilitation compared to other groups. It is therefore assumed that these persons will be in greater need of support during the vocational rehabilitation process. The level of unemployment within a geographical area was also found to influence the length of sick leave. CONCLUSIONS: Our suggestion is for rehabilitation programs to be developed and selected to match the special needs and differences whether they are of individual or of social nature.     

The prevalence of dental anxiety in patients of a university dental clinic

Dental anxiety remains a pervasive barrier to dental treatment for many individuals, including college-age patients. In this article, the author reviews dental anxiety and examines the usefulness of assessment instruments for identifying dental anxiety. Using 2 unique assessment instruments, he examines the prevalence of dental anxiety in his university dental clinic's patient population. The 2 assessment instruments were determined to be equally effective in identifying anxious dental patients. Both instruments revealed that the average patient surveyed had low-to-mild dental anxiety. The results of this survey concur with those of previous studies of college-populations.