Bayesian analysis of covariance under inverse Gaussian model

This paper considers the problem of analysis of covariance (ANCOVA) under the assumption of inverse Gaussian distribution for response variable from the Bayesian point of view. We develop a fully Bayesian model for ANCOVA based on the conjugate prior distributions for parameters contained in the model. The Bayes estimator of parameters, ANCOVA model and adjusted effects for both treatments and covariates along with predictive distribution of future observations are developed. We also provide the essentials for comparing adjusted treatments effects and adjusted factor effects. A simulation study and a real world application are also performed to illustrate and evaluate the proposed Bayesian model.     

Inferences on stress–strength parameter based on GLD5 distribution

Let X and Y be independent random variables distributed as generalized Lindley distribution type 5 (GLD5). This article deals with the estimation of the stress–strength parameter R = P(Y < X), which plays an important role in reliability analysis. For this purpose, the maximum likelihood and the uniformly minimum variance unbiased estimators are presented in the explicit form. Moreover, considering Arnold and Strauss’ bivariate Gamma distribution as an informative prior and Jeffreys’ as noninformative prior, the Bayes estimators are derived. Various bootstrap confidence intervals are also proposed and, finally, the presented methods are compared using a simulation study.     

Necessary and sufficient conditions for stochastic orders between (n − r + 1)-out-of-n systems in proportional hazard (reversed hazard) rates model

Consider two (n ? r + 1)-out-of-n systems, one with independent and non-identically distributed components and another with independent and identically distributed components. When the lifetimes of components follow the proportional hazard rates model, we establish a necessary and sufficient condition for the usual stochastic order to hold between the lifetimes of these two systems. For the special case of r = 2, some generalized forms of this result to the hazard rate, dispersive and likelihood ratio orders are also obtained. Moreover, for the case when the lifetimes of components follow the proportional reversed hazard rates model, we derive some similar results for comparing the lifetimes of two systems . Applications of the established results to different situations are finally illustrated.     

Some new results on aggregate claim amounts from two heterogeneous Marshall–Olkin extended exponential portfolios

In this work, we discuss some stochastic comparisons of two aggregate claim amounts. Applications of our results to the value-at-risk and tail-value-at-risk are also mentioned. It is also shown that the aggregate claim amounts of risks exhibiting a weak form of dependence known as positive cumulative dependence (negatively associated) is larger (smaller) in convex order than the corresponding aggregate claim amounts under the theoretical independence assumption. The obtained results show that the correlations between individual risks increase stop-loss premiums corresponding to aggregate claim amounts. The results established here complete and extend the results of Barmalzan, Payandeh Najafabadi, and Balakrishnan (2017 Barmalzan, G., A. T. Payandeh Najafabadi, and N. Balakrishnan. 2017. Ordering results for aggregate claim amounts from two heterogeneous Marshall–Olkin extended exponential portfolios and their applications in insurance analysis. Theory of Probability and its Applications(to appear). [Google Scholar], Theory of Probability and its Applications, to appear).     

What Explains the 2007–2009 Drop in Employment?

We show that deterioration in household balance sheets, or the housing net worth channel, played a significant role in the sharp decline in U.S. employment between 2007 and 2009. Counties with a larger decline in housing net worth experience a larger decline in non‐tradable employment. This result is not driven by industry‐specific supply‐side shocks, exposure to the construction sector, policy‐induced business uncertainty, or contemporaneous credit supply tightening. We find little evidence of labor market adjustment in response to the housing net worth shock. There is no significant expansion of the tradable sector in counties with the largest decline in housing net worth. Further, there is little evidence of wage adjustment within or emigration out of the hardest hit counties.     

The Fundamental Endogeneity of Survey-Based Cultural Dimension

Survey-based cultural dimensions are used extensively in empirical analysis as the primary source of quantitative cultural scores. However, survey-based cultural dimensions have a significant endogeneity problem. The individuals responding to the surveys are affected by their current socioeconomic condition and environment (social mood), meaning that the outcomes are a mixture of culture and current socioeconomic effects. The World Value Survey (WVS) waves provided empirical support for the endogeneity problem. Our empirical findings show that in-country scores frequently change between waves. In addition, the countries in the WVS change their ranking between waves; so, even the relative position held by a country is questionable when measured along survey-based cultural dimensions. This finding contrasts with the idea that cultural values are sticky. We provide an alternative method for capturing cultural dimensions based on the grammatical structures of languages that capture ancestral culture with no fear of the current socioeconomics pollution of the measure.     

Social media and Web 2.0 for knowledge sharing in product design

Working collaboratively with internal and external partners (suppliers, customers and internal stakeholders) has been at the epicentre of product design. Knowledge sharing has been well recognised in this context. However, there is limited research that has addressed the role of social media/Web 2.0 in facilitating knowledge sharing for sense- and decision-making within product design. To address this gap, this study draws on the resource-based view (RBV) of the firm and two vignettes that relate to ‘collaborative co-design’ and ‘collaborative design-to-order’. We illustrate the role of social media/Web 2.0 in building knowledge sharing capabilities for sense- and decision-making for internal and external partners during product design. Limitations and further research into the use of social media/Web 2.0 are also discussed.     

Finite-Sample Properties of Some Alternative GMM Estimators

We investigate the small-sample properties of three alternative generalized method of moments (GMM) estimators of asset-pricing models. The estimators that we consider include ones in which the weighting matrix is iterated to convergence and ones in which the weighting matrix is changed with each choice of the parameters. Particular attention is devoted to assessing the performance of the asymptotic theory for making inferences based directly on the deterioration of GMM criterion functions.     

A Right to Exist: A Palestinian speaks

This paper links theory with practice. It discusses original video footage of Palestinians living in the Occupied Territories, filmed by an all-woman crew of Western film-makers and Palestinians, which aims to challenge mainstream Orientalist discourses. The footage was shot in and around Al Aroub refugee camp in the West Bank and distributed through a variety of exhibition platforms. Western representations of Arabs are normally framed in a manner that allows little sympathy and/or understanding of their plight. Research has also shown a lack of knowledge in the West about the Palestinian/Israeli conflict. Focusing on “ordinary and everyday” aspects of Palestinian life, rendered often “extraordinary” by the circumstances of occupation, the footage attempts to draw connections and similarities for a Western audience and to illustrate that Palestinian daily lives are not “played out” only in opposition to the Israeli regime. The paper explores methods of enabling access to Palestinian voices in their own terms, while eliciting the empathy of audiences more accustomed to dramatised and stereotyped images of Palestinian life in Western news and current affairs footage.     

Public Attitudes toward Abortion in Israel: A Research Note

Objective . For the first time since the mid-1970s, this study explored sociodemographic correlates of abortion attitudes among Israeli Jews and compared them with those reported by the General Social Survey in the United States. Methods . A survey in the representative sample of Jewish adults living in urban areas across Israel ( N = 546) that included two related items on the attitude toward abortion for nonvital reasons. Results . Using multiple regression, four statistically and socially significant correlates of antiabortion attitudes were identified: Greater religiosity (especially Ultra-Orthodox affiliation), lower than average income, greater number of children, and right-wing political preference. Gender and age did not emerge as significant correlates of abortion attitudes. Whereas American Jews form the mainstay of the prochoice camp, Jews in Israel are clearly divided along the lines of religiosity, ethnicity, socioeconomic status, and political views. Conclusions . In both Israel and the United States, the sociodemographic profiles of abortion supporters and opponents have been rather similar and stable over the last 25 years. This may point to the stable patterns of religiosity in both societies, since antiabortion sentiments have mainly been fueled by religious fundamentalism, regardless of formal denomination.