In recent years, a variety of regression models, including zero-inflated and hurdle versions, have been proposed to explain the case of a dependent variable with respect to exogenous covariates. Apart from the classical Poisson, negative binomial and generalised Poisson distributions, many proposals have appeared in the statistical literature, perhaps in response to the new possibilities offered by advanced software that now enables researchers to implement numerous special functions in a relatively simple way. However, we believe that a significant research gap remains, since very little attention has been paid to the quasi-binomial distribution, which was first proposed over fifty years ago. We believe this distribution might constitute a valid alternative to existing regression models, in situations in which the variable has bounded support. Therefore, in this paper we present a zero-inflated regression model based on the quasi-binomial distribution, taking into account the moments and maximum likelihood estimators, and perform a score test to compare the zero-inflated quasi-binomial distribution with the zero-inflated binomial distribution, and the zero-inflated model with the homogeneous model (the model in which covariates are not considered). This analysis is illustrated with two data sets that are well known in the statistical literature and which contain a large number of zeros. 相似文献
Many queer theorists, like many queer activists and perhaps many LGBT people in general, regard religion as so inimical to their purposes and lives that it is not even worthy of critique; references to religion in queer theory, queer studies, and even LGBT studies are usually sparse, brief, and generally derogatory. Likewise, within most of the field of religious studies, queerness is rarely an issue of concern or even consciousness except in the context of organizational tensions over the proper roles of "homosexuals." While there is a growing body of work that brings these two fields together, the study of religion seems to be adapting only haltingly and partially to contemporary developments inLGBTstudies and queer theory. This essay assesses the current state of the "proto-fields" of LGBT studies and queer studies in religion, offers suggestions for new directions in the future, and considers the potential benefits of the interaction of these fields. 相似文献
We use individual data from a panel of families during the depth of the peso crisis in Mexico to investigate whether the transition
of the male household head from employment into unemployment affects the labor force participation of his spouse and children.
We find that significant added-worker effects are in operation especially for adult females (wives), but no evidence that
the labor force participation, the school attendance, and the likelihood of advancing to the next school grade of teenage
males are influenced by the event of unemployment of the household head. The head's unemployment is significantly associated
with a higher probability that teenage females do not attend school. However, lower attendance does not appear to impede their
advancement to the next grade.
Auditors' assessment of management's dispositions presumably affects their subsequent judgments. However, little is known about the process by which auditors infer characteristics of management. This paper proposes the theory of correspondent inferences [25] as a framework for examining auditors' assessment of management's dispositions; the model is tested in a laboratory experiment using experienced audit managers. The results are consistent with the proposed theoretical framework. Implications for future research are discussed. 相似文献
R. J. Reynolds Tobacco USA (RJR) is currently implementing a microcomputer-based decision support system to computerize and optimize the selection of patterns for loading cases of finished product into truck trailers at RJR's Central Distribution Center. This system allows for the efficient loading of trucks with less supervision. Total annual savings from reduced personnel and shipping costs is approximately $850,000. In addition to these benefits, the system is a stepping stone for trailer loading automation and the integration of a comprehensive load planning system. 相似文献
Studies of economic insecurity tend to focus on changes in incomes and transitions in and out of income poverty. Yet family economic conditions are shaped by more than just income. Levels of assets and wealth, and changes in these over time also play a role. To identify which groups of the poor have been structurally trapped in poverty over time, using the Korean Welfare Panel Study, we examined the dynamics of asset poverty from 2005 to 2014. We defined three asset poverty lines by operationalizing assets as resources for either future consumption or development. Findings show that asset poverty experience in a previous year significantly increased the probability to incur asset poverty by 5–12% for all analysis samples. In addition, the probability of incurring asset poverty decreased with home ownership, higher disposable income, and greater diversification of the household portfolio. Our findings suggest that the asset poor are likely to fall into structural and persistent poverty over time, and an asset-building approach is needed to improve the asset poverty status of households in South Korea.
Caleb Perry Patterson was a leader in the discipline of political science during a long career. He is remembered as the founder of the national political science honor society, Pi Sigma Alpha, and as a charter founder of the Southwestern Political Science Association (now the Southwestern Social Science Association). Both were founded a century ago, in 1920. While his role in founding those organizations is one of his legacies, his career was much more than that. He was a notable educator, an activist in the politics of his time, and a prolific scholar. He used an oratorical presentation style to inspire generations of students, and through promotion of constitutional values, he encouraged independence of thought. One prominent Texas political observer summed up his impact as encouraging students of all political stripes to “love the thing that is America” and to provide critical thinking during the McCarthy Era. With Patterson as his reference, he concluded that “the only thing that can save us is the professors, really.” 相似文献
The growth in macro-level income inequality in the United States is well established, but less is known about patterns of inequality at subnational scales and how they vary between and within rural and urban localities. Using data from the Decennial Census and American Community Survey, we produce estimates of within-county income inequality from 1970 to 2016 and analyze differences in inequality levels, the persistence of high (low) inequality, and populations' exposure to high (low) inequality across the rural-urban continuum. We find that income inequality has historically been higher in non-metropolitan than metropolitan counties, but inequality levels converged by 2016 due to growing inequality in metropolitan counties. Additionally, levels of inequality were generally persistent within counties over time, except that counties characterized by low inequality in 1970 were unlikely to remain as such in 2016. Third, non-trivial shares of the metropolitan population resided in low-inequality contexts in 1970, but virtually none of the U.S. population resided in such places by 2016. Residence in high-inequality counties is normative in rural and urban America. This statistical analysis provides an updated portrait of income inequality across the rural-urban continuum, and should spur additional research on stratification in rural America during an era of growing inequality. 相似文献
This paper analyzes the problem of choosing the optimal order quantity and its associated number of standard containers making up the order for single-period inventory models under standard container size discounts. A range is determined that contains the optimal order quantity. Two algorithms are presented. The first algorithm solves the general case in which there is no restriction on the types of containers included in an order. The second algorithm solves a more restricted policy that requires the buyer to accept the order with successively smaller container sizes. 相似文献