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Non-linear state space modelling of fisheries biomass dynamics by using Metropolis-Hastings within-Gibbs sampling 总被引:1,自引:0,他引:1
Russell B. Millar & Renate Meyer 《Journal of the Royal Statistical Society. Series C, Applied statistics》2000,49(3):327-342
State space modelling and Bayesian analysis are both active areas of applied research in fisheries stock assessment. Combining these two methodologies facilitates the fitting of state space models that may be non-linear and have non-normal errors, and hence it is particularly useful for modelling fisheries dynamics. Here, this approach is demonstrated by fitting a non-linear surplus production model to data on South Atlantic albacore tuna ( Thunnus alalunga ). The state space approach allows for random variability in both the data (the measurement of relative biomass) and in annual biomass dynamics of the tuna stock. Sampling from the joint posterior distribution of the unobservables was achieved by using Metropolis-Hastings within-Gibbs sampling. 相似文献
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This historical overview explores the crucial and changing relationships between faith‐based organisations and governments, not only in the implementation of social services but also in the formation of social policy. Historically Australian governments have left large areas of social provision to the non‐government sector. For example, income support for the unemployed was not taken up by governments until World War II and income support for sole parents remained largely a responsibility for non‐government organisations (NGOs) until the 1970s. Prior to governments taking responsibility for income support, most of these NGOs were religious organisations surviving on donations, philanthropic support and limited government funding. It is argued that the dominant, semi‐public role of religious organisations in service delivery and social policy formation is an important but largely overlooked aspect of the Australian historical experience. 相似文献
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This paper describes the leadership function of self-sacrifice in organizational settings using a multiple-level model of leadership. It explores why self-sacrificial behaviors would arise in organizational settings and what would be the effects on followers if a leader exhibits self-sacrificial behaviors. It is proposed that self-sacrificial leadership will facilitate individual and organizational adaptations to changing environments and that followers will attribute charisma and legitimacy to a self-sacrificial leader and intend to reciprocate. 相似文献
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Elizabeth Rudd Emory Morrison Renate Sadrozinski Maresi Nerad Joseph Cerny 《Journal of marriage and the family》2008,70(1):228-238
Using a national survey of 508 art history Ph.D.s including data on graduate school performance and careers 10 – 15 years post‐Ph.D., this study investigates gender, family, and academic tenure in art history, the humanities field with the highest proportion of women. Alternative hypotheses derived from three perspectives—termed here clockwork, two‐body, and synergy—are evaluated with multivariate logistic regression. Analysis finds that marriage increases men’s tenure odds and decreases women’s, but that some types of marriages do not decrease women’s odds, and some types dramatically increase men’s. This study calls attention to male advantage in female‐dominated academic disciplines and demonstrates the potential to better understand the interactions of gender, marriage, and careers by conceptualizing different types of marriages. 相似文献
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Does Biology Matter?: Lesbian Couples' Transition to Parenthood and Their Division of Labor 总被引:1,自引:0,他引:1
The effect of biological motherhood on parents' transition to parenthood and their division of labor is a much contested issue. This paper explores the impact of biological motherhood in a unique context—lesbian parenthood—where biological requirements can be analytically separated from gender effects. The analysis is based on a study of 25 middle-class lesbian couples' transition to parenthood and their division of labor. Each couple had at least one biological child under the age of six and all children were born within the context of the couples' relationship. I conducted in-depth interviews with each partner and all participants filled out a short questionnaire. The distinction between the biological and non-biological mother affected couples in three domains of motherhood: public, relational, and personal motherhood. Comothers countered public ignorance, social and legal invisibility, and the lack of biological connection to the child by sharing primary childcare and establishing a distinct parenting role within the family. The participants employed various models of the division of labor to provide one full-time mother for as long as economically possible. Desire to be with the child, economic considerations, and strong commitments to equality and shared motherhood rather than biological requirements informed decisions about leave strategies and long-term paid work arrangements. Time/availability proved to be the best predictor of involvement in family work. Conflicts erupted whenever one partner perceived the other as not doing her fair share of domestic work. 相似文献
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Renate Kosuch 《Gruppendynamik und Organisationsberatung》2008,39(2):150-167
The ability of mental self regulation is becoming more and more important to shape change processes. Change agents often experience, especially in potentially difficult situations, limits of self regulation by volition. Imperating oneself as an effort of self control by unconditional commandments has a blocking impact on mental self regulation. Introvision supports mental self regulation in a mode of calmness, which can be described as operating effortless and deliberately. In an attitude of calmness it is possible not to slide into inner conflicts, even when facing difficult situations. Instead it is possible to make use of one‘s whole action repertoire and include the context of change processes. calmness also has a positive impact on group dynamics. The atmosphere becomes more relaxed, dialog ability and the capability of problem solving is supported. 相似文献
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