On Vervaat and Vervaat-error-type processes for partial sums and renewals

We study the asymptotic behaviour of stochastic processes that are generated by sums of partial sums of i.i.d. random variables and their renewals. We conclude that these processes cannot converge weakly to any nondegenerate random element of the space D[0,1]$D[0,1]$. On the other hand, we show that their properly normalized integrals as Vervaat-type stochastic processes converge weakly to a squared Wiener process. Moreover, we also deal with the asymptotic behaviour of the deviations of these processes, the so-called Vervaat-error-type processes.     

Long run variance estimation and robust regression testing using sharp origin kernels with no truncation

A new family of kernels is suggested for use in long run variance (LRV) estimation and robust regression testing. The kernels are constructed by taking powers of the Bartlett kernel and are intended to be used with no truncation (or bandwidth) parameter. As the power parameter (ρ)$(\rho )$ increases, the kernels become very sharp at the origin and increasingly downweight values away from the origin, thereby achieving effects similar to a bandwidth parameter. Sharp origin kernels can be used in regression testing in much the same way as conventional kernels with no truncation, as suggested in the work of Kiefer and Vogelsang [2002a, Heteroskedasticity-autocorrelation robust testing using bandwidth equal to sample size. Econometric Theory 18, 1350–1366, 2002b, Heteroskedasticity-autocorrelation robust standard errors using the Bartlett kernel without truncation, Econometrica 70, 2093–2095] Analysis and simulations indicate that sharp origin kernels lead to tests with improved size properties relative to conventional tests and better power properties than other tests using Bartlett and other conventional kernels without truncation.     

Profust reliability of linear and circular type F and G systems having two failure criteria under Markov dependency

In this study, the profust reliabilities of (n, f, k): F(G) and < n, f, k > : F(G) systems for Markov dependent components are investigated. Having two failure criteria are the common features of these four systems. The usage of both fuzzy approach and two failure criteria in the same system provides us more realistic approach to evaluate the reliability of more complex systems. The component configurations are examined for both linear and circular sequences and the working principle of systems are studied for both F and G systems. Under all these assumptions, the profust reliabilities of (n, f, k): F(G) and < n, f, k > : F(G) systems are obtained using the distribution of run statistics. Also a new membership function different from the linear membership function which is generally used in the literature is proposed. Some numerical results which allow the comparison of the systems from various perspectives and various figures for both linear and circular type systems are presented. Some special cases (between Markov – iid assumption, conventional – profust reliability) are also considered.     

Generalized growth curve models for longitudinal data in application to a randomized controlled trial

Growth curve analysis is beneficial in longitudinal studies, where the pattern of response variables measured repeatedly over time is of interest, yet unknown. In this article, we propose generalized growth curve models under a polynomial regression framework and offer a complete process that identifies the parsimonious growth curves for different groups of interest, as well as compares the curves. A higher order of a polynomial degree generally provides more flexible regression, yet it may suffer from the complicated and overfitted model in practice. Therefore, we employ the model selection procedure that chooses the optimal degree of a polynomial consistently. Consideration of a quadratic inference function (Qu et al., 2000) for estimation on regression parameters is addressed and estimation efficiency is improved by incorporating the within-subject correlation commonly existing in longitudinal data. In biomedical studies, it is of particular interest to compare multiple treatments and provide an effective one. We further conduct the hypothesis test that assesses the equality of the growth curves through an asymptotic chi-square test statistic. The proposed methodology is employed on a randomized controlled longitudinal dataset on depression. The effectiveness of our procedure is also confirmed with simulation studies.     

Gender differences in financial risk tolerance

The purpose of this research is to explore gender differences in financial risk tolerance using a large, nationally representative dataset, the Survey of Consumer Finances. The impact of the explanatory variables in the model is allowed to differ between men and women to decompose gender differences in financial risk tolerance. The results indicate that gender differences in financial risk tolerance are explained by gender differences in the individual determinants of financial risk tolerance, and that the disparity does not result from gender in and of itself. The individual variables that moderate the relationship between gender and high risk tolerance are income uncertainty and net worth, with income uncertainty moderating the relationship between gender and some risk tolerance. Financial fiduciaries should understand the differences in income uncertainty and net worth between men and women and how those differences relate to risk tolerance.     

How do vulnerable youth complete secondary education? The key role of families and the community

This article demonstrates how the engagement of families and other community members in decision-making processes in a school may prevent early school leaving among vulnerable youth and simultaneously increase their enrolment in secondary education. Based on a large-scale, EU-funded study, this article focuses on the case of one school located in a deprived area inhabited mainly by Roma people – one of the vulnerable populations most affected by early school leaving – where a specific egalitarian participatory process of Roma families was implemented. According to the analysis of the collected data, this participation contributed to a reduction in student dropout rates during primary education, led to the implementation of compulsory secondary education in the same school, and increased the numbers of students who graduated from secondary school. These achievements transformed the educational and social prospects of vulnerable youth who were following the path to failure and who now dream of continuing their studies. Furthermore, these youth are acting as role models for younger children in primary education, helping to prevent school dropout and early school leaving from early ages. The case shows how the community participation in decision-making processes transformed the climate and expectations regarding education in the neighbourhood.     

奥康纳《西藏民间故事》英译本叙事建构探析

随着翻译研究的不断深入,人们逐渐认识到翻译并非完全中立的语码转换行为,而且还是一种受制于意识形态和赞助人等诸多因素操控的政治行为。在20世纪初英国对中国西藏的入侵战争中,英国人奥康纳通过《西藏民间故事》的英译诱使读者接受英军入侵中国西藏的合法性,为英国入侵中国西藏制造声势,以实现排斥中国对西藏的主权,建立英国对西藏保护关系之政治目的。     

Macroeconomic impact of public debt and foreign aid in Sri Lanka

Accumulation of public debt in Sri Lanka is raised significantly since the independence. It exceeded 100% of gross domestic products (GDP) in the late 1980s and the early 2000s. Although it has been declined in the recent past and becomes 79.3% of GDP in 2016; the high level of debt in a weak fiscal position of the small economy Sri Lanka is an issue of concern. In this backdrop, this paper examines the impact of public debt and foreign aid on income, price level and interest rate in Sri Lanka for the post-reform period. It is found that public debt in general and foreign debt, in particular, depresses income and stimulates price level. Domestic debt has some impact on the price level. On the other hand, foreign aid has a deleterious effect on both the income and price level. The foreign debt and aid have raised interest rate both in the short-run and in the long-run, while no significant impact of the domestic debt on interest rate is found. Based on these findings, the paper elaborates on some long-term measures for reducing the dependence on debt and aid in Sri Lanka.