Two-way ANOVA when the distribution of the error terms is skew t

In this article, we assume that the distribution of the error terms is skew t in two-way analysis of variance (ANOVA). Skew t distribution is very flexible for modeling the symmetric and the skew datasets, since it reduces to the well-known normal, skew normal, and Student's t distributions. We obtain the estimators of the model parameters by using the maximum likelihood (ML) and the modified maximum likelihood (MML) methodologies. We also propose new test statistics based on these estimators for testing the equality of the treatment and the block means and also the interaction effect. The efficiencies of the ML and the MML estimators and the power values of the test statistics based on them are compared with the corresponding normal theory results via Monte Carlo simulation study. Simulation results show that the proposed methodologies are more preferable. We also show that the test statistics based on the ML estimators are more powerful than the test statistics based on the MML estimators as expected. However, power values of the test statistics based on the MML estimators are very close to the corresponding test statistics based on the ML estimators. At the end of the study, a real life example is given to show the implementation of the proposed methodologies.     

Dividedness,Institutions and Economic Performance: A Cross-National Analysis of Democratic Stability

Why divided societies face particular obstacles in maintaining democracy is one of the most challenging questions posed in the literature. Several studies posit that ethnically, religiously, and linguistically divided societies are incapable of establishing and holding a democratic system because of their social divisions and institutional weaknesses. We challenge this argument and examine whether political institutional arrangements (constraints over the executive, geographic distribution of political power, and form of government) in addition to economic performance are the crucial factors of success to establish and sustain a democratic regime and social unity in divided states. We use the Quality of Governance time-series standard dataset to test this hypothesis. By analyzing data on 163 states (1960–2012) we find that institutional constraints imposed over the executive and economic performance are the two primary influential factors in sustaining democratic regimes in multi-ethnic, multi-linguistic, and multi-religious societies.     

Process evaluation of a diversity training program: the value of a mixed method strategy

Patients’ health and health needs are influenced by categories of difference like sex, gender, ethnic origin and socioeconomic status (SES). To enhance awareness of this diversity among patients and to provide holistic care for them, health professionals should first be aware of the relation between dimensions of diversity and patients’ health and health demands. This paper presents a formative process evaluation of a diversity sensitivity training programme for healthcare professionals. The training was implemented in three healthcare settings (mental healthcare, nursing home and hospital care). Mixed methods were used to monitor the implementation of the training and its effects after three years. Findings demonstrate that the training stimulated participants’ awareness, knowledge and critical attitudes towards diversity. Their motivation and willingness to take action regarding diversity was also enhanced. Yet these developments were less apparent among nursing home participants who felt less satisfied and did not develop a critical perspective on this issue. Qualitative data were helpful to explain differences between the settings. By means of the combination of quantitative and qualitative data, we can conclude that individual learning was not enough to guarantee a sensitive approach to diversity at the organizational level.     

A new painting process for vessel radiators of transformer: wet-on-wet

The painting process of corrugated wall radiators of a distribution transformer is performed by a flow-down painting technique in the industrial field. This study has been prepared in accordance with ISO 12944-5. Correspondingly, this work is motivated by Epoxy 2-pack paints (4.3.4.2) to obtain minimum requirements for C3 atmospheric corrosivity categories (5.1.1). This standard requires from the vertical surface of the vessel of the transformer to be painted with epoxy paints that contain anti-corrosive pigments with a minimum of 100?µm dry film thickness. In the present study, a new production methodology called wet-on-wet (WOW) painting is developed which has never been used in industry. In addition, a modified response surface methodology (RSM) is proposed for designing, modeling, and optimizing the proposed process under unsteady environmental effects. The results indicate that the WOW painting can be applied to real industrial systems successfully by the aid of the proposed new RSM algorithm and provide remarkable time and cost savings.     

Trimmed likelihood estimators for lifetime experiments and their influence functions

We study the behaviour of trimmed likelihood estimators (TLEs) for lifetime models with exponential or lognormal distributions possessing a linear or nonlinear link function. In particular, we investigate the difference between two possible definitions for the TLE, one called original trimmed likelihood estimator (OTLE) and one called modified trimmed likelihood estimator (MTLE) which is the finite sample version of a form for location and linear regression used by Bednarski and Clarke [Trimmed likelihood estimation of location and scale of the normal distribution. Aust J Statist. 1993;35:141–153, Asymptotics for an adaptive trimmed likelihood location estimator. Statistics. 2002;36:1–8] and Bednarski et al. [Adaptive trimmed likelihood estimation in regression. Discuss Math Probab Stat. 2010;30:203–219]. The OTLE is always an MTLE but the MTLE may not be unique even in cases where the OLTE is unique. We compare especially the functional forms of both types of estimators, characterize the difference with the implicit function theorem and indicate situations where they coincide and where they do not coincide. Since the functional form of the MTLE has a simpler form, we use it then for deriving the influence function, again with the help of the implicit function theorem. The derivation of the influence function for the functional form of the OTLE is similar but more complicated.     

Value of a Product: A Definition

Value of a product reflects the owner(s)'/buyer(s)' desire to retain or obtain a product. Individual's level of desire to retain or obtain a product depends on how much the product details and/or its performance agree with the value system of the individual. To an individual, therefore, value of a product includes cost and a subjective part associated with cost. Value of a product can be expressed in units of currency if the subjective part of it is assessed in units of currency. This paper aims to propose a definition of value of a product and develop a method to assess it in units of a currency. To test the methodology in practice, experiments are conducted and the values of two of the elements of the external envelope of residential housing projects are determined. This revised version was published online in July 2006 with corrections to the Cover Date.     

Sexual Abuse in a Classroom of Ten Male Students: A Group Victimization

The term “professional perpetrator” is used to describe individuals who commit sexual abuse in the capacity of a position of trust such as a teacher, household member, or employer. There is an increasing body of evidence focusing on educator sexual abuse in the school environment. However, data are limited about this topic. The aim of this paper is to present the rare occurrence of the case of a male teacher in Turkey who sexually abused his students in an elementary school. Although it is unknown which populations are most vulnerable to sexual abuse, in Turkey we think that the indigenous population is at risk. Abuse cases are not logged into the criminal justice system because the majority of abuse allegations are ignored or disbelieved by families.