"Building" exact confidence nets

Confidence nets, that is, collections of confidence intervals that fill out the parameter space and whose exact parameter coverage can be computed, are familiar in nonparametric statistics. Here, the distributional assumptions are based on invariance under the action of a finite reflection group. Exact confidence nets are exhibited for a single parameter, based on the root system of the group. The main result is a formula for the generating function of the coverage interval probabilities. The proof makes use of the theory of "buildings" and the Chevalley factorization theorem for the length distribution on Cayley graphs of finite reflection groups.Comment: 20 pages. To appear in Bernoull

The Oswald Clergy Burnout Scale: reliability, factor structure and preliminary application among Australian clergy

This study assesses the Oswald Clergy Burnout Scale (OCBI), the psychometric properties of which have not been previously described. Analysis of responses from a large number (N  = 3,012) of ministers in charge of Australian congregations showed that the scale’s internal reliability was satisfactory, and that the scale could be represented by two factors, identified, respectively, as the personal and social aspects of burnout. This structure was supported by confirmatory factor analysis. Several demographic and job-related variables that might relate to burnout were regressed on the total, personal and social factor scores. Age is the predominant (negative) predictor of burnout as measured by the total scale and the personal factor scores. All variables predict burnout as measured by the social factor. However, in all models, the predictor variables account for no more than 5% of the total variance. These findings suggest that demographic factors and working conditions are poor predictors of burnout among clergy

The psychological-type profile of lay church leaders in Australia

A sample of 845 lay church leaders (444 women and 401 men) from a range of 24 different denominations and movements (including house churches and independent churches) completed the Francis Psychological-Type Scales within the context of the 2006 Australian National Church Life Survey. The psychological-type profiles of these lay church leaders were almost identical to the type profiles of 1527 Australian churchgoers (936 women and 591 men) published in an earlier study by Robbins and Francis. The predominant types among female lay church leaders were ISFJ (21%), ESFJ (21%), and ISTJ (18%). The predominant types among male lay church leaders were ISTJ (28%), ISFJ (17%), ESTJ (13%), and ESFJ (12%). The SJ temperament accounted for 67% of the female lay church leaders and for 70% of the male lay church leaders. The strengths and weaknesses of the SJ leadership style are discussed

The teenage religion and values survey in England and Wales : an overview

The Teenage Religion and Values Survey was conducted throughout the 1990s among young people between the ages of 13 and 15 years. A total of 33,982 young people took part in the survey. As the next phase of this research begins for the twenty-first century this paper looks back at the survey conducted in the 1990s and considers two aspects of the research. First, this paper considers the methodology behind designing such a survey. Second, this paper considers some of the insights generated by the survey under five headings: personality, spiritual health, religious affiliation, belonging without believing, and church leaving

Modeling Nonaxisymmetric Bow Shocks: Solution Method and Exact Analytic Solutions

A new solution method is presented for steady-state, momentum-conserving, non-axisymmetric bow shocks and colliding winds in the thin-shell limit. This is a generalization of previous formulations to include a density gradient in the pre-shock ambient medium, as well as anisotropy in the pre-shock wind. For cases where the wind is unaccelerated, the formalism yields exact, analytic solutions. Solutions are presented for two bow shock cases: (1) that due to a star moving supersonically with respect to an ambient medium with a density gradient perpendicular to the stellar velocity, and (2) that due to a star with a misaligned, axisymmetric wind moving in a uniform medium. It is also shown under quite general circumstances that the total rate of energy thermalization in the bow shock is independent of the details of the wind asymmetry, including the orientation of the non-axisymmetric driving wind, provided the wind is non-accelerating and point-symmetric. A typical feature of the solutions is that the region near the standoff point is tilted, so that the star does not lie along the bisector of a parabolic fit to the standoff region. The principal use of this work is to infer the origin of bow shock asymmetries, whether due to the wind or ambient medium, or both.Comment: 26 pages and 6 figures accepted to ap

Deformation mechanics of deep surface flaw cracks

A combined analytical and experimental program was conducted to determine the deformation characteristics of deep surface cracks in Mode I loading. An approximate plane finite element analysis was performed to make a parameter study on the influence of crack depth, crack geometry, and stress level on plastic zones, crack opening displacement, and back surface dimpling in Fe-3Si steel and 2219-T87 aluminum. Surface replication and profiling techniques were used to examine back surface dimple configurations in 2219-T87 aluminum. Interferometry and holography were used to evaluate the potential of various optical techniques to detect small surface dimples on large surface areas

Thermal stress cycling of GaAs solar cells

A thermal cycling experiment was performed on GaAs solar cells to establish the electrical and structural integrity of these cells under the temperature conditions of a simulated low-Earth orbit of 3-year duration. Thirty single junction GaAs cells were obtained and tests were performed to establish the beginning-of-life characteristics of these cells. The tests consisted of cell I-V power output curves, from which were obtained short-circuit current, open circuit voltage, fill factor, and cell efficiency, and optical micrographs, spectral response, and ion microprobe mass analysis (IMMA) depth profiles on both the front surfaces and the front metallic contacts of the cells. Following 5,000 thermal cycles, the performance of the cells was reexamined in addition to any factors which might contribute to performance degradation. It is established that, after 5,000 thermal cycles, the cells retain their power output with no loss of structural integrity or change in physical appearance

Playing through the pain: Self-reported shoulder function of uninjured rugby players.

Introduction: The shoulder is the most commonly injured joint in rugby league and among the top 3 in rugby union. Contact injuries make up the majority of shoulder injuries in rugby, but many shoulder pathologies are of insidious onset or linked to training loads. Given that previous injury is the greatest risk factor for future injury in many sports, it is pertinent to develop methods which detect early stage pathology. At present, it is not yet known what the prevalence of players playing with an existing sub-clinical shoulder dysfunction are. The Rugby Shoulder Score (RSS), a uni-dimensional 120-point scale (20 – 140), was developed to monitor shoulder function in players undergoing rehabilitation from shoulder injury. The aim of this study was to use the RSS to estimate the prevalence of sub-clinical shoulder dysfunction in a sample of professional and amateur rugby players. Methods: Following ethical approval from the Leeds Beckett University research ethics committee, 86 uninjured players provided written informed consent. RSS assessments were administered, via paper questionnaire, at the mid-point of the season. All players were participating in training and match play at the time of assessment. The sample consisted of 34 professional and 52 amateur players respectively. A RSS of 20 represents a perfect score. An increasing RSS indicates increasing shoulder dysfunction. Results: The mean RSS score for the entire sample was 35. Professional players demonstrated greater shoulder dysfunction than amateur players (RSS 42 vs. 30; P20) was more than half of the sample. Professionals tended to have greater shoulder dysfunction than amateurs. A threshold for minimal clinical importance of the RSS does not exist. However, for a sub group of players (n=17) an RSS range has been identified which appears to indicate a level of dysfunction which may affect match play and training

Congregational bonding social capital and psychological type : an empirical enquiry among Australian churchgoers

This study explores the variation in levels of bonding social capital experienced by individual churchgoers, drawing on data generated by the Australian National Church Life Survey, and employing a five-item measure of church-related bonding social capital. Data provided by 2065 Australian churchgoers are used to test the thesis that individual differences in bonding social capital are related to a psychological model of psychological types (employing the Jungian distinctions). The data demonstrated that higher levels of bonding social capital were found among extraverts (compared with introverts), among intuitive types (compared with sensing types) and among feeling types (compared with thinking types), but no significant differences were found between judging types and perceiving types