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241.
242.
“It's better than it used to be”: Perspectives of adolescent siblings of children with an autism spectrum condition
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Rebecca Soraya Gorjy Angela Fielding Marita Falkmer 《Child & Family Social Work》2017,22(4):1488-1496
This article reports on the lived experiences of 11 adolescents who have a brother or a sister with a diagnosis of autism spectrum condition. Through semistructured, in‐depth, in‐person interviews, these adolescents shared their experiences and perceptions. These exploratory findings can be used to inform the practice of social workers and other health professionals, and future research. Implications for practice focus on the importance of exploring experiences and perceptions of siblings of children diagnosed with autism spectrum condition to enhance support services for these siblings. 相似文献
243.
ABSTRACT. We present a new method for estimating the edge of a two-dimensional bounded set, given a finite random set of points drawn from the interior. The estimator is based both on Haar series and extreme values of the point process. We give conditions for various kind of convergence and we obtain remarkably different possible limit distributions. We propose a method of reducing the negative bias, illustrated by a simulation. 相似文献
244.
We used data from the study of Marital Instability Over the Life Course to examine links between divorce in the grandparent generation and outcomes in the grandchild generation (N= 691). Divorce in the first (G1) generation was associated with lower education, more marital discord, weaker ties with mothers, and weaker ties with fathers in the third (G3) generation. These associations were mediated by family characteristics in the middle (G2) generation, including lower education, more marital discord, more divorce, and greater tension in early parent‐child relationships. In supplementary analyses, we found no evidence that the estimated effects of divorce differed by offspring gender or became weaker over time. Our results suggest that divorce has consequences for subsequent generations, including individuals who were not yet born at the time of the original divorce. 相似文献
245.
Regression coefficients specify the partial effect of a regressor on the dependent variable. Sometimes the bivariate or limited multivariate relationship of that regressor variable with the dependent variable is known from population‐level data. We show here that such population‐level data can be used to reduce variance and bias about estimates of those regression coefficients from sample survey data. The method of constrained MLE is used to achieve these improvements. Its statistical properties are first described. The method constrains the weighted sum of all the covariate‐specific associations (partial effects) of the regressors on the dependent variable to equal the overall association of one or more regressors, where the latter is known exactly from the population data. We refer to those regressors whose bivariate or limited multivariate relationships with the dependent variable are constrained by population data as being "directly constrained." Our study investigates the improvements in the estimation of directly constrained variables as well as the improvements in the estimation of other regressor variables that may be correlated with the directly constrained variables, and thus "indirectly constrained" by the population data. The example application is to the marital fertility of black versus white women. The difference between white and black women's rates of marital fertility, available from population‐level data, gives the overall association of race with fertility. We show that the constrained MLE technique both provides a far more powerful statistical test of the partial effect of being black and purges the test of a bias that would otherwise distort the estimated magnitude of this effect. We find only trivial reductions, however, in the standard errors of the parameters for indirectly constrained regressors. 相似文献
246.
According to Condorcet, the larger the team of decision-makers using the simple majority rule, the more likely they are to
reach correct decisions. This paper examines the validity of this claim under the condition of reduced team competence with
size. Determining committee size always involves quality-versus-quantity dilemma. This study provides criteria, as well as
an algorithm, for deciding on the optimum size of boards and committees.
Received: 18 January 2002/Accepted: 22 April 2002
The authors acknowledge the helpful comments of an anonymous referee. 相似文献
247.
We consider a likelihood approximation in generalized linear mixed-effects models (GLMM) with multilevel nested random effects. Likelihood evaluation in such models is difficult, hindered by the need for high dimensional integration, where the dimension is proportional to the number of units per level and the number of random effects per unit. Various integration approaches have been proposed, including the penalized quasi-likelihood method, Laplace approximation, quadrature approximation, simulation, and MCMC algorithms. We propose a new quadrature approximation method, which is based on the spherical radial integration approach of Monahan and Genz (J Am Stat Assoc 92:664–674 1997), and at the same time takes advantage of the hierarchical structure of the integration. Our new hierarchical spherical radial method has a time complexity that is linear in the number of units per level and the number of random effects per unit, in contrast to the exponential complexity of the adaptive Gaussian quadrature method of Pinheiro and Chao (J Comput Graph Stat 15:58–81 2006) for the same problem. Using a spline approximation, the generalized additive mixed models (GAMM) are GLMMs with two levels of nested random effects. We apply our method to estimation of GAMMs. We compare it with competing methods through simulations and apply our method to analyze virologic and immunologic responses in an AIDS clinical trial. An R package is written and available at http://?users.?wpi.?edu/?~jgagnon/?software.?html. 相似文献
248.
Fermín Mallén Ricardo Chiva Joaquín Alegre Jacob Guinot 《Review of Managerial Science》2016,10(3):463-485
Organizational learning capability is a key element in organizational performance. This issue spurs interest to discover how to generate environments with high organizational learning capability. In this paper, we analyze the relationship between the degree of organicity of the structure, organizational performance and organizational learning capability. A total of 251 firms with demonstrated excellence in human resource management took part in the study. Results suggest that the degree of organicity of the structure has a positive relationship with performance perceptions and this relationship is fully mediated by organizational learning capability. 相似文献
249.
Perceptions of Structural Injustice and Efficacy: Participation in Low/Moderate/High‐Cost Forms of Collective Action
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Prior studies on perceptions of structural disadvantage and injustice, efficacy, and collective action have suffered from two major limitations: (1) they have used single‐country samples, usually of economically advanced countries, and (2) generally theorized and investigated perceptions of structural injustice and efficacy separately. Drawing on value‐expectancy theory, we provide an integrated theory to predict direct and conditional effects of efficacy and perceptions of structural disadvantage and injustice on collective action within countries. To address the limitations of previous research, we use cross‐national data of 29 countries, including economically advanced and less advanced nations, to test how well these hypotheses explain within‐country variation in collective action. We find that internal efficacy is significantly and positively associated with low‐ and moderate‐cost collective action, whereas organizational embeddedness, a proxy for political efficacy, is significantly and positively associated with low‐, moderate‐, and high‐cost collective action. Perceptions of legitimate and unjust structural disadvantage are also positively associated with all types of collective action. Importantly, the positive effects of both types of efficacy on high‐cost collective action are conditional on perceptions of structural injustice. That is, participation in high‐cost collective action is more likely for those who are both efficacious and perceive structural disadvantage as unjust. 相似文献
250.
Jacob Kornbeck 《Social Work Education》2013,32(2):247-261
F. Tönnies's 'Gemeinschaft'/'Gesellschaft' dichotomy is discussed as an analytical and explanatory framework for identifying individual social work education modules' relevance to immigrant- and migration-related problems in social work practice. It is claimed that 'Gemeinschaft' (community) skills are especially needed in these practice contexts, as opposed to the more scientific, legal or administrative 'Gesellschaft' (state, society) skills. Two empirical studies from Germany dealing with the necessary competencies for social workers advising immigrants are drawn upon. A variety of other case study material is included to make the point that social workers need 'Gemeinschaft' skills more than has traditionally been assumed. 相似文献