EMPIRICAL PERFORMANCE OF GARCH MODELS WITH HEAVY‐TAILED INNOVATIONS

We introduce a new type of heavy‐tailed distribution, the normal reciprocal inverse Gaussian distribution (NRIG), to the GARCH and Glosten‐Jagannathan‐Runkle (1993) GARCH models, and compare its empirical performance with two other popular types of heavy‐tailed distribution, the Student's t distribution and the normal inverse Gaussian distribution (NIG), using a variety of asset return series. Our results illustrate that there is no overwhelmingly dominant distribution in fitting the data under the GARCH framework, although the NRIG distribution performs slightly better than the other two types of distribution. For market indexes series, it is important to introduce both GJR‐terms and the NRIG distribution to improve the models’ performance, but it is ambiguous for individual stock prices series. Our results also show the GJR‐GARCH NRIG model has practical advantages in quantitative risk management. Finally, the convergence of numerical solutions in maximum‐likelihood estimation of GARCH and GJR‐GARCH models with the three types of heavy‐tailed distribution is investigated.     

Cost comparison of continued anticoagulation with rivaroxaban versus placebo based on the 1-year EINSTEIN-Extension trial efficacy and safety results

Aims: The EINSTEIN-Extension trial (EINSTEIN-EXT) found that continued treatment with rivaroxaban for an additional 6 or 12 months (vs placebo) after 6–12 months of initial anticoagulation significantly reduced the risk of recurrent venous thromboembolism (VTE) with a small non-significant increased risk of major bleeding (none fatal or in critical site). This study aimed to compare total healthcare cost between rivaroxaban and placebo, based on the EINSTEIN-EXT event rates.

Methods: Total healthcare cost was calculated as the sum of treatment and clinical event costs from a US managed care perspective. Treatment duration and event rates were obtained from the EINSTEIN-EXT study. Adjustment on treatment duration was made by assuming a 10% non-adherence rate. Drug costs were based on wholesale acquisition costs. Cost estimates for clinical events (i.e. recurrent deep vein thrombosis [DVT], recurrent pulmonary embolism, major bleeding, clinically relevant non-major bleeding) were determined from the literature. Results were examined over a ±20% range of each cost component and over 95% confidence intervals (CIs) of event rate differences in deterministic (one-way) and probabilistic sensitivity analyses (PSA).

Results: Total healthcare cost was $1,454 lower for rivaroxaban-treated (vs placebo-treated) patients in the base-case, with a lower clinical event cost fully offsetting drug cost. The cost savings of recurrent DVT alone (–$3,102) was greater than drug cost ($2,723). Total healthcare cost remained lower for rivaroxaban in the majority (73%) of PSA (cost difference [95% CI]?=?–$1,454 [–$2,396, $1,231]).

Limitations: This study was conducted over the 1-year observation period of the EINSTEIN-EXT trial, which limited “real-world” applicability and examination of long-term economic impact. Assumptions on drug and clinical event costs were US-based and, thus, not applicable to other healthcare systems.

Conclusions: Total healthcare costs were estimated to be lower for patients continuing rivaroxaban therapy compared to those receiving placebo in VTE patients who had completed 6–12 months of VTE treatment.     

跨文化交际与外语教学

外语教学中重语言教学、轻文化教学这一现象有其产生的原因，同时也凸显了外语教学中跨文化交际技能培养的重要性。     

基于农业产业化的河南省区域差距研究

文章通过泰尔指数发现从1990年到2005年，河南省区域经济的差距处于一个快速扩大的阶段。通过定量分析发现，河南省区域经济发展水平和发展速度与农业生产具有一定的负相关性，通过定性和定量分析发现，农业产业化对区域差距缩小具有一定的作用，但不起主要作用，一是由于目前河南省农业产业化水平相对还是比较低，农业收入还仅仅停留于农产品的买卖价格，工资性收入所占比重过低，二是农业产业化龙头企业带动能力还是比较弱，带动面小，限制了农区经济的发展水平和速度，最后提出了几点建议。     

谈谈酒店商务楼层的起源与发展

商务楼层作为一种特定的楼层，在世界各地兴起和迅速发展。通过阐述商务楼层的意义、起源与发展，揭示商务楼层与其他楼层的不同之处，目的是促使商务楼层进一步完善发展。     

《技术制图》新旧标准对照

以对照方法介绍了《技术制图》与《机械制图》中三个基础标准的适用范围、采标情况及基本内容。     

网上证券交易的国际比较和借鉴

网上证券交易是全球证券经纪业务发展的一大趋势，而我国在这方面尚处于初步发展阶段，文章主要阐述借鉴其他国家在网上证券交易的相关做法，结合我国现状提出对发展我国网上证券业务的建议。     

跨文化交际中饮食文化差异研究

不同的民族和国家存在着各具特色的饮食文化，具有浓郁的民族性和多样性的特点。饮食文化的差异也是跨文化交际中影响交际结果的因素之一。了解中西方饮食文化的差异，理解其深刻的文化内涵，探究其文化底蕴，能促成文化的进一步交流、互补与兼容。     

文化差异对中国大学生英语写作的影响

文化差异对学生的外语学习尤其是写作影响很大。文化差异对篇章结构、语句结构、措词和修辞都产生影响。     

物流标准化对物流企业竞争力提升的作用分析

物流标准化问题已成为制约我国物流发展的瓶颈问题之一,而物流产业的发展需要产业内的公司的竞争力的持续提升,由产业组织经济学对企业竞争力的解释框架,可得出企业竞争力的市场表现主要有成本优势、差异优势和领先优势三个方面。本文将分别从这三个方面分析物流标准化对物流企业竞争力提升的作用。