Applications of schur theory to reliability inference for k of n systems

The results of Hoeffding (1956), Pledger and Proschan (1971), Gleser (1975) and Boland and Proschan (1983) are used to obtain Buehler (1957) 1-α lower confidence limits for the reliability of k of n systems of independent components when the subsystem data have equal sample sizes and the observed failures satisfy certain conditions. To the best of our knowledge, for k ≠ 1 or n, this is the first time the exact optimal lower confidence limits for system reliability have been given. The observed failure vectors are a generalization of key test results for k of n systems, k ≠ n (Soms (1984) and Winterbottom (1974)). Two examples applying the above theory are also given.     

Smoothing Splines with Boundary Correction

Regular smoothing splines are known to have a type of boundary bias problem that can reduce their estimation efficiency. In this paper, a boundary corrected smoothing spline with general order is designed in a way that the risk will decay at an optimal rate. An O(n) algorithm is also developed to compute the resultant estimator efficiently.     

Pension scheme fees and charge ratios in 44 countries: A comparative study

Based on data received from pension supervisory authorities, the article reviews 85 different pension schemes in 44 jurisdictions by looking at fees and charges as well as their legal ceilings and their development since 2014. A key finding is the observed decrease in fees and caps. The article presents jurisdictions according to clusters, i.e. by groups of countries with identical or very similar items already covered by pension fees, and analyses the extent to which various cost and fee elements are covered by fees charged to members. Finally, we calculate charge ratios for each cluster to quantify the impact of fees and charges on pension savings. Occupational defined contribution pension schemes and personal plans linked to employment tend to be much more cost effective than personal schemes that have no direct employment link.     

古兰学与经注学关系研究

古兰学(‘Ulūmal-qur’ān)是研究《古兰经》的基础学科,也是伊斯兰文化体系的传统学科。尽管古兰学是一门独立学科,但它因以《古兰经》为研究对象而具有多学科交叉特点,并由此产生了若干分支学科,经注学(‘ilmal-tafsir)则是其中最重要的主干学科。古兰学与经注学在学科原理和认知经文层面的共性关系,既有助于人们了解和理解《古兰经》的文体经义,也为伊斯兰文化发展提供不可或缺的思想资源。     

Reforming against all odds: Multi‐pillar pension systems in the Czech Republic and Romania

Attempts to replace pay‐as‐you‐go pension schemes with private funded systems came to a halt in Central and Eastern Europe after 2005. However, more recently, the region has witnessed two belated reformers: the Czech Republic and Romania. Both countries decided to partially privatize pensions despite the rising tide of evidence concerning the challenges associated with the policy. We argue that while part of the domestic political elite remained supportive of private funded pensions, the difficulties experienced by earlier reformers and reduced support from International Financial Institutions led to the adoption of small funded pension pillars. Such cautious attempts at privatization might become more common in the future as large reforms have proven politically unsustainable.     

A call for more elaborate and transparent pension data to inform policy‐making: A critical examination of World Bank data for Eastern Europe

This article offers a critical analysis of the methods by means of which data relating to the performance of second pillar pension schemes are collated, compared and reported. This is done with regard to the performance of mandatory private second pillar pension funds in Eastern Europe. By critically examining data published in a number of World Bank studies, and through the identification of data problems and irregularities, the article argues that a much more elaborate and transparent approach to the collation, comparative analysis and reporting of data is needed. Required is the establishment of a consensus regarding what should represent a robust basis for making credible policy recommendations, not least with regard to pension re‐reforms in the countries of Eastern Europe and elsewhere. In the absence of such a consensus, unresolved data problems and irregularities may potentially continue to influence the formulation of incomplete national policy conclusions regarding the performance of second pillar pension funds and, in turn, the ability of policy‐makers to evaluate appropriately the need for, and assess the feasibility of implementing in a sustainable manner, pension re‐reform.     

From pension funds to piggy banks: (Perverse) consequences of the Stability and Growth Pact since the crisis

As part of their strategy for economic and monetary union, European governments committed themselves to fiscal discipline – particularly by placing limits on annual deficits and on public debt. Subsequently, and as they sought to respond to the “current crisis”, they embraced the view that only if public finances were kept under control would sustainable recovery be possible. Rules of fiscal governance were strengthened. To help them meet these rules, the governments of many member States of the European Union made changes to their pension systems or to funds they had established specifically to pay the costs of population ageing. The intention was not to cut retirement benefits or to improve the efficiency of the relevant pension schemes and institutions. Rather, it was to free up resources immediately. Funded pension schemes and pension funds were treated like “piggy banks” that were raided when times became hard. Moreover, the policies pursued succeeded in meeting their objectives only because the system of national accounts according to which outcomes are judged does not recognize the way in which most of the fiscal gains are matched by future fiscal liabilities.     

Optimal Composite Markers for Time‐Dependent Receiver Operating Characteristic Curves with Censored Survival Data

Abstract. To increase the predictive abilities of several plasma biomarkers on the coronary artery disease (CAD)‐related vital statuses over time, our research interest mainly focuses on seeking combinations of these biomarkers with the highest time‐dependent receiver operating characteristic curves. An extended generalized linear model (EGLM) with time‐varying coefficients and an unknown bivariate link function is used to characterize the conditional distribution of time to CAD‐related death. Based on censored survival data, two non‐parametric procedures are proposed to estimate the optimal composite markers, linear predictors in the EGLM model. Estimation methods for the classification accuracies of the optimal composite markers are also proposed. In the article we establish theoretical results of the estimators and examine the corresponding finite‐sample properties through a series of simulations with different sample sizes, censoring rates and censoring mechanisms. Our optimization procedures and estimators are further shown to be useful through an application to a prospective cohort study of patients undergoing angiography.     

Linking taxation and social protection: Evidence on redistribution and poverty reduction in Ethiopia

Although redistribution results from the simultaneous effects of taxes and transfers, analyses of their distributional effects in low‐income countries have largely been undertaken from singular perspectives. This article jointly assesses the distributional effect of taxes and transfers (through social protection) using Ethiopia as a case study. We find that Ethiopia's flagship social protection programme is more effective than income taxation in achieving poverty reduction, while neither policy achieves a sizeable reduction in overall inequality. We also find that Ethiopia does not currently have the capacity to close the poverty gap or to fully fund its main safety net programme using domestic income sources alone.     

全球治理：结构与过程

20世纪90年代以来,全球治理这一术语开始广泛传播,然而无论是其价值诉求还是政治主张都面临着太多争议。本文对全球治理的结构、过程、合法性和原动力进行理论总结,并对全球治理的规则和机制进行了相关分析。本文认为,全球治理的原动力在于适当地赋予非国家公共权力治理的合法性,以及普通公民对普遍价值和世界主义的学习能力。