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81.
BjÖRn Gustafsson 《European Journal of Social Work》1998,1(2):203-220
Social assistance receipt among first-time unemployed in Sweden is investigated by analysing data files obtained by merging register data from the city of Goteborg. First-time unemployed males were observed during 1993 and 1994 and were followed in the register of social assistance recipients for 18 months after the debut. Many of the newly unemployed had no access to unemployment compensation. Slightly more than one out of five newly unemployed became social assistance recipients. Lengthy periods of unemployment combined with no access to unemployment compensation signify a high risk of becoming a social assistance recipient. This risk varies a great deal with age, citizenship, human capital and job search activity of the unemployed. 相似文献
82.
The Poisson regression is very popular in applied researches when analyzing the count data. However, multicollinearity problem arises for the Poisson regression model when the independent variables are highly intercorrelated. Shrinkage estimator is a commonly applied solution to the general problem caused by multicollinearity. Recently, the ridge regression (RR) estimators and some methods for estimating the ridge parameter k in the Poisson regression have been proposed. It has been found that some estimators are better than the commonly used maximum-likelihood (ML) estimator and some other RR estimators. In this study, the modified Jackknifed Poisson ridge regression (MJPR) estimator is proposed to remedy the multicollinearity. A simulation study and a real data example are provided to evaluate the performance of estimators. Both mean-squared error and the percentage relative error are considered as the performance criteria. The simulation study and the real data example results show that the proposed MJPR method outperforms the Poisson ridge regression, Jackknifed Poisson ridge regression and the ML in all of the different situations evaluated in this paper. 相似文献
83.
Influence of Distribution of Animals between Dose Groups on Estimated Benchmark Dose and Animal Distress for Quantal Responses
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Increasingly, dose‐response data are being evaluated with the benchmark dose (BMD) approach rather than by the less precise no‐observed‐adverse‐effect‐level (NOAEL) approach. However, the basis for designing animal experiments, using equally sized dose groups, is still primed for the NOAEL approach. The major objective here was to assess the impact of using dose groups of unequal size on both the quality of the BMD and overall animal distress. We examined study designs with a total number of 200 animals distributed in four dose groups employing quantal data generated by Monte Carlo simulations. Placing more animals at doses close to the targeted BMD provided an estimate of BMD that was slightly better than the standard design with equally sized dose groups. In situations involving a clear dose‐response, this translates into fewer animals receiving high doses and thus less overall animal distress. Accordingly, in connection with risk and safety assessment, animal distress can potentially be reduced by distributing the animals appropriately between dose groups without decreasing the quality of the information obtained. 相似文献
84.
Our aim was to describe and develop an understanding of children’s lived experiences of coping with stress. Twenty‐three Swedish children, ages 10–12, wrote open letters and were interviewed. The phenomenological analysis resulted in three main themes: (i) depending on oneself, others and the world around, (ii) choosing to be a doer and (iii) being in the here and now. We understood the children’s lived experiences of coping with stress as them being relaxed and powerful. The children chose to be active doers or inactive beings and their relationships, as well as their surroundings, helped or hindered their coping. Possible health promotion work is discussed. 相似文献
85.
86.
Nilgün Özgül 《统计学通讯:理论与方法》2019,48(2)
The aim of this letter to acknowledge of priority on calibration estimation. There are numerous studies on calibration estimation in literature. The studies on calibration estimation are reviewed and it is found out that an existing calibration estimator is reprocessed in the recent paper published by Nidhi et al. (2007). 相似文献
87.
İlknur Özmen 《统计学通讯:理论与方法》2013,42(12):2109-2127
In this study, estimation of the parameters of the zero-inflated count regression models and computations of posterior model probabilities of the log-linear models defined for each zero-inflated count regression models are investigated from the Bayesian point of view. In addition, determinations of the most suitable log-linear and regression models are investigated. It is known that zero-inflated count regression models cover zero-inflated Poisson, zero-inflated negative binomial, and zero-inflated generalized Poisson regression models. The classical approach has some problematic points but the Bayesian approach does not have similar flaws. This work points out the reasons for using the Bayesian approach. It also lists advantages and disadvantages of the classical and Bayesian approaches. As an application, a zoological data set, including structural and sampling zeros, is used in the presence of extra zeros. In this work, it is observed that fitting a zero-inflated negative binomial regression model creates no problems at all, even though it is known that fitting a zero-inflated negative binomial regression model is the most problematic procedure in the classical approach. Additionally, it is found that the best fitting model is the log-linear model under the negative binomial regression model, which does not include three-way interactions of factors. 相似文献
88.
Statistics and Computing - We introduce and analyze a parallel sequential Monte Carlo methodology for the numerical solution of optimization problems that involve the minimization of a cost... 相似文献
89.
If the future market wage is uncertain, engaging in long‐term employment is risky, with the risk depending on how regulated the labor market is. In our experiment long‐term employment can result either from offering long‐term contracts or from repeatedly and mutually opting for rematching. Treatments differ in how regulations restrict the employer's flexibility in adapting the employment contract. All treatments allow for longer contract duration as well as for mutually opting to be rematched. Effort is chosen by employees after a contract is concluded. Treatments vary from no contract flexibility to no restriction at all. Will more (downward) flexibility be used in ongoing employment but reduce labor market efficiency? And will regulation crowd out long‐term employment, in the form of long‐term contracts or voluntary rematching? (JEL C72, C90, F16, J21, J24, L10) 相似文献
90.
Foreign Employers as Relief Routes: Women,Multinational Corporations and Managerial Careers in Japan
Ödül Bozkurt 《Gender, Work and Organization》2012,19(3):225-253
This article argues that multinational corporations may provide critical relief routes for women workers' progress in managerial careers in national contexts where their career paths with domestic employers remain blocked by traditional and institutional practices. It illustrates this possibility through a study of two women managers at the local head office of a foreign‐owned multinational retailer in Japan and their career trajectories. The alternative career paths through foreign employers are not without their contingencies and constraints, and the article identifies the limitations of the transformative potential foreign employers could have in the larger realm of women's managerial employment in a restrictive context such as Japan. Noting that globalization incorporates different groups of workers into the global economy with different costs and rewards, the article concludes by calling for a more nuanced understanding of women's employment with multinationals and for further research that remains cognizant of the multiplicity of experiences in different contexts. 相似文献