The Fisher information loss on the dependence parameter is considered for three one-parameter Gaussian processes on a rectangular lattice when some values are not observed. Formulae are given for the general case, and simplified versions for two of the special cases. Approximations are considered, and cases with a small number of missing sites are compared. 相似文献
Finding a subset collection that provides optimal population coverage is a frequently encountered deterministic problem. A random
sample is often used to formulate the optimal coverage (OC) model, which is then used to select the subsets that provide the
estimated optimal population coverage. Such problems are ubiquitous and occur in both the public and private sectors; examples include
media selection, placement of municipal services such as sirens and waste dumps, and reserve site selection. Conceptualizing
sample elements as counts in a contingency table, we show how decision-makers can combine prior information with sample data
to help formulate OC models. We consider conjugate and vague priors with classical and empirical Bayesian interpretations.
We show that the predictive approach yields a common marketing exposure model that has previously been justified empirically.
Finally, we demonstrate the potential importance of our results on problems generated from a well-known example from the literature. 相似文献
In this article, an empirical study on super-leadership is documented. Based on the self-leadership approach a questionnaire was developed to evaluate super-leadership. 175 employees from various branches have participated to this study. Explorative factor analysis revealed two dimensions of super-leadership which could be interpreted as ??coaching and communicative support?? and ??promoting autonomy and self-responsibility??. Further data analysis showed positive correlations between super-leadership and perceived leadership effectiveness. Partly depending on the degree of organizational decentralization, positive correlations were also found between super-leadership and overall job satisfaction. Implications for research and potential applications will be discussed. 相似文献
Twenty-five years ago, David Cantor and Kenneth Land presented a model of the relationship between unemployment and crime. This model showed the complexity of this seemingly simple relationship. Namely, there are two independent and counteracting effects from unemployment that affect crime: motivation and guardianship. In their analysis, Cantor and Land found that the guardianship effect dominates the motivation effect, but subsequent research has questioned this result. In this paper, the unemployment and crime relationship is tested using a neighborhood level hybrid modeling approach. Such a method allows for the nuances of Cantor and Land’s model to be tested at a fine ecological resolution for the first time. It is found that both motivation and guardianship matter for crime, but at different time frames: motivation matters in the long-run whereas guardianship matters in the short-run, similar to what Cantor and Land hypothesized. 相似文献
In Amartya Sen's capability approach, policy makers can focus on different levels to influence the well-being of a society. A dimension that is usually neglected is improving individuals’ “conversion efficiency”, i.e. the efficiency with which individual resources are converted into well-being. To examine effects of policies on (the development of) this measure we suggest an intertemporal index of conversion efficiency estimated via a nonparametric order-m approach. The approach is exemplified using data from the British Household Panel Survey (BHPS) from 1991 to 2006. We find that over this time horizon between 24% and 29% of individuals were efficient in their conversion of resources into well-being. Moreover, age and self-employment increase an individual's conversion efficiency, while living in London, being disabled and being separated, divorced or widowed all decrease conversion efficiency. Being married also decreases the conversion efficiency and we find few evidence of gender disparities in conversion efficiency. 相似文献
The paper examines the issue of weights and importance in composite indices of development. Building a composite index involves several steps, one of them being the weighting of variables. The nominal weight assigned to a variable often differs from the degree to which the variable affects the scores of the overall index. The newly suggested notion of importance is based on the idea that an important indicator, if omitted from the index, causes large changes in countries’ results. We propose a method of measuring the importance and apply it to inequality variables in composite indices of development. The results show a low importance for most inequality variables, and for some of them, a large discrepancy between the nominal weights and the importance. We argue that the importance of variables should be considered in the process of index construction. This may imply a modification of the index when there is a large discrepancy between the nominal weights and importance and when the importance of some variables is extremely low. Whether any such modification is justified must be decided within the context of the particular index.
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The aim of this study was to determine if objective and self-reported measures of physical capacity are two equivalent methods to detect changes following an intervention in obese older women. 36 obese women aged between 55 and 75 years participated in a 3-month study with the aim of improving physical capacity by caloric restriction and/or resistance training. Physical capacity was measured objectively with 10 different tests and self-reported with the SF-36 physical functioning score (SF-36 PF score). Then the performance-to-objective tests were computed using quartiles to provide a baseline global physical capacity score. The mean percentage of change of the 10 tests as well as the SF-36 PF score were also calculated after the study. Body composition was measured by dual-energy X-ray (DXA) absorptiometry. The baseline global physical capacity score and the SF-36 PF score were significantly correlated at baseline (r = 0.43; P < 0.01). Eight out of the 10 objective tests of physical capacity improved after the intervention, while no improvement was observed for the SF-36 PF score. On average, percentage of change in physical capacity was 4.1 ± 5.9% for the SF-36 PF score and 11.1 ± 2.9% for the objective measures. However, no significant correlation was observed between percentage of changes between the two approaches after the intervention (r = 0.32; P = 0.07). Based on these results, the method used to quantify physical capacity after an intervention may have major implications on the outcomes. The methods used should be carefully analyzed in regard to the objective of the study. 相似文献