An evaluation of physical fitness parameters for graduate students

Although graduate physical therapy students are taught the principles of fitness for incorporation into their professional lives, they have difficulty finding the time to implement these principles during graduate school. The authors studied 3 successive classes of graduate physical therapy students at the beginning and ending of their respective programs. They found that the women's percentages of body fat were significantly greater over the period of the study. The men's lower extremity strength decreased at the slower speeds (60 degrees/second), and the women showed increased strength at the higher speeds (180 and 240 degrees/second, respectively). Male grip strength significantly increased over the period of the study. To decrease students' percentages of body fat and increase their strength, the authors asserted that physical therapy students should be allowed more time to participate in fitness activities during their graduate school years.     

Conservatism of the Accident Sequence Evaluation Program HRA Procedure

This paper presents a limited assessment of the conservatism of the Accident Sequence Evaluation Program (ASEP) human reliability analysis (HRA) procedure described in NUREG/CR-4772. The data for this study are derived from simulator examination reports from the NRC requalification examination cycle for nuclear power plant operators. The ASEP procedure was used to estimate human error probability (HEP) values for critical tasks, and the HEP results were compared with the failure rates observed in the examinations. The ASEP procedure was applied by PNNL operator license examiners who supplemented the limited information in the examination reports with expert judgment based upon their extensive simulator examination experience. Comparison of the average of the ASEP HEP values with the fraction of the population actually failed and demonstrated that the ASEP HEP values are larger (conservative) by a statistically significant average factor of two. Partitioning of tasks into subgroups based on the ASEP HEP values and comparison of the subgroup average ASEP HEP values with observed subgroup failure rates showed little or no conservatism for small ASEP HEP values, but considerable conservatism for larger ASEP HEP values.     

The influence of the economic crisis on quality of care for older people: system readiness for innovation in Europe

The aim of this study is to examine the influence of the recent economic crisis on the quality of long-term care for older people in Belgium and the Netherlands. A mixed-method approach was applied, primarily focused on conducting semi-structured qualitative interviews with health professionals working in a management role in organizations providing long-term care for older people. The results show that Dutch organizations seem to be prepared for the influences of the economic crisis on the quality of its care provision primarily in terms of a sound system readiness. At the same time, Belgian organizations seem to be prepared for the influences of the economic crisis on the quality of its care provision primarily in terms of a favorable sociopolitical context. Comparing two countries allows for reciprocal lesson-drawing. The conclusion drawn in this study is that a sustainable long-term care system requires above all stability and structure.     

The Multi-method Comprehensive Review: Synthesis and Analysis when Scholarship is International,Interdisciplinary, and Immense

VOLUNTAS: International Journal of Voluntary and Nonprofit Organizations - This article presents a new strategy for reviewing large, multidisciplinary academic literatures: a multi-method...     

Split Hamiltonian Monte Carlo

We show how the Hamiltonian Monte Carlo algorithm can sometimes be speeded up by “splitting” the Hamiltonian in a way that allows much of the movement around the state space to be done at low computational cost. One context where this is possible is when the log density of the distribution of interest (the potential energy function) can be written as the log of a Gaussian density, which is a quadratic function, plus a slowly-varying function. Hamiltonian dynamics for quadratic energy functions can be analytically solved. With the splitting technique, only the slowly-varying part of the energy needs to be handled numerically, and this can be done with a larger stepsize (and hence fewer steps) than would be necessary with a direct simulation of the dynamics. Another context where splitting helps is when the most important terms of the potential energy function and its gradient can be evaluated quickly, with only a slowly-varying part requiring costly computations. With splitting, the quick portion can be handled with a small stepsize, while the costly portion uses a larger stepsize. We show that both of these splitting approaches can reduce the computational cost of sampling from the posterior distribution for a logistic regression model, using either a Gaussian approximation centered on the posterior mode, or a Hamiltonian split into a term that depends on only a small number of critical cases, and another term that involves the larger number of cases whose influence on the posterior distribution is small.     

The Probability of Teenage Parenthood: Parental Predictions and Their Accuracy

Teenage parenthood is an often-discussed topic in family economics since it has been shown to affect many outcomes for the teen, child, and household. Using a nationally representative longitudinal panel of American teenagers and their parents, two questions related to the probability of teenage parenthood are examined. First, how do predictions of this occurrence made by the teenager’s parents vary across the population? Second, how does the accuracy of these predictions vary? The actual prevalence and variance of teenage parenthood are also examined, and the determinants of its occurrence are estimated. Among other results, expectations and their accuracy are found to differ substantially across socioeconomic status and some demographics such as race and religion. The average American parent underestimates the probability their child will become a teen parent by only a small amount, but within certain demographic groups this outcome is considerably underestimated, and in others it is overestimated. These differences help explain the variability in teen parenthood effects, and more broadly, the analysis serves as a test of parents’ ability to judge their childrens’ future outcomes.     

The Effect of 21st Century Military Service on Civilian Labor and Educational Outcomes

I estimate the effect of military service during the Afghanistan and Iraq wars on civilian labor and educational outcomes using several empirical methodologies including sibling fixed effects and propensity score matching. Since military occupations and training have changed significantly in the past few decades, these effects may be different than those found in previous studies on veterans of earlier theaters. I find that veteran status increases civilian wages by approximately ten percent for minorities but has little or no effect on whites in this regard. Veterans of all demographic groups are found to be equally employable and equally as satisfied with their civilian occupation as non-veterans. For females and minorities, veteran status substantially increases the likelihood one attempts college. These veterans are found to be more apt to pursue and obtain a two year (associate’s) degree instead of a four year (bachelor’s) degree. Lastly, I find mixed evidence that veteran status increases the likelihood of public sector employment.     

HISPANIC MEDIA USE AND PERCEPTIONS OF DISCRIMINATION:

This study utilizes data from the Latino National Political Survey to evaluate the relationship between several social and cultural variables, media use, and Hispanic perceptions of discrimination. We examine the effects that level of income and education, personal experience, ethnicity, and political party preference and media exposure have on these perceptions. The examination builds on social-psychological theories and media framing/cultivation arguments. The cross-section, regression analysis considers Hispanics as a whole and as various subgroups (Mexicans, Puerto Ricans, and Cubans), respectively. Contrary to conventional wisdom that media use is positively related to perceived discrimination, we find that socioeconomic and ethnic conditions are of greater import for understanding perceptions. Further, it appears that media use has little impact on perceptions of discrimination.     

Developmental trends in proxemic spacing behavior between surrounding companions and strangers in casual groups

This study examined age differences in the pattern of proxemic behavior observed in casual groups frequenting public environments. Observations were made in the corridors of large shopping malls and along sidewalks of small towns. The relative positions of all walking subjects were inconspicuously recorded in photographs, and interpersonal distances were measured by projecting slides on a calibrated grid. Distances to first, second, and third nearest companions and first, second, and third nearest strangers were computed for subjects in six age classes: preschool children, grade school children, teenagers, young adults, middle adults, and senior adults. All classes showed significant age differences in the distances maintained to companions (p = .00001), but only senior adults differed in their spacing toward strangers, by maintaining significantly closer distances than the other age groups (p < .01). Tests of spatial patterns showed significant aggregations between first, second, and third nearest companions, and essentially random spacing toward first nearest strangers in all age groups. Senior adults showed a significant tendency to aggregate with their second and third nearest surrounding strangers. These results are discussed in the light of oer research and in the context of the ecology and development of proxemic behavior.Funding was provided by a National Science Foundation grant, BNS 79-06843, to J.W. Burgess. Additional fundint was provided by a grant from the Consumer Research Center, University of California (Robert Sommer, Director), and by Sigma Xi grants to J.W. Burgess. The author thanks Ms. Deanna Johnson for expert help in behavioral observation and decoding.     

非对称信息市场理论对规范中国劳动力市场秩序的启示

信息不对称是导致中国劳动力市场秩序混乱的主要原因之一。斯宾塞的劳动力市场模型解决了信息非对称条件下的均衡实现问题,同时也揭示了信息不对称下均衡效率低下、劳动力市场混乱的事实。运用这一模型对我国劳动力市场存在的问题作了进一步解释,并提出了规范我国劳动力市场的对策。