A new bivariate distribution in natural exponential family

We propose a new bivariate distribution following a GLM form i.e., natural exponential family given the constantly correlated covariance matrix. The proposed distribution can represent an independent bivariate gamma distribution as a special case. In order to derive the distribution we utilize an integrating factor method to satisfy the integrability condition of the quasi-score function. The derived distribution becomes a mixture of discrete and absolute continuous distributions. The proposal of our new bivariate distribution will make it possible to develop some bivariate generalized linear models. Further the discrete correlated bivariate distribution will also arise from an independent bivariate Poisson mass function by compounding our proposed distribution (Iwasaki and Tsubaki, 2002).Received March 2003     

欧元区成员国通胀差异成因研究

在欧元区内部,不同国家之间的通胀率存在不容忽视的差别。欧元区各经济体间究竟为什么会存在差别如此之大的通胀率呢?什么因素及在多大程度上影响了通胀率的差异?文章从巴拉萨—萨缪尔森效应、价格的收敛效应、输入性通胀、本国要素市场结构差异、本国财政政策和经济周期等六个方面,使用实证数据和面板数据回归探讨了这些问题。     

我国海洋产业碳排放核算研究

立足于海洋经济可持续发展的基本目标,探讨发展海洋产业低碳化核算问题。尝试运用改进的Kaya等式和LMDI分解法,对海洋产业CO2排放量变动的影响因素进行了测算与贡献率分析,运用碳排放系数核算了海洋产业碳排放值及碳排放强度,并根据核算结果提出海洋产业低碳化的实现思路。     

消费者对可追溯牛肉的认知及其影响因素分析——基于结构方程模型

利用针对北京市城区消费者的402份调查问卷数据,运用结构方程模型,分析了消费者对可追溯牛肉的认知及其影响因素。结果显示,消费者对可追溯牛肉的认知水平较低,但消费者在信息强化后对可追溯牛肉安全性的评价较高;信息搜集和经济文化因素显著影响消费者对可追溯牛肉的认知水平,风险感知、牛肉重要性和经济文化因素显著影响消费者对可追溯牛肉的认知内容,但认知水平并不显著影响认知内容。最后提出相关对策建议。     

企业竞合行为的演化博弈分析--以我国创意产业为例

近年来,创意产业不仅成为学界关注的热点,也成为政府和企业专注与投资的特点。企业之间竞合行为将直接决定其竞争力,进而影响我国创意产业竞争力与发展方向。本文基于文化创意产业集群内企业间的竞合行为,运用演化博弈的理论方法,建立了核心企业之间的横向对称博弈及核心企业与其相邻下游企业之间的纵向非对称博弈的数理模型,分析了其演变的动态过程。研究结果表明,该系统的演化方向与双方博弈的支付矩阵相关,博弈结果受到合作收益、初始合作成本、独立创新能力、合作成功率、以及双方初始状态等因素的影响,最后给出了相关建议,为整合我国文化产业集群提供了理论依据。     

Economies of scale in the Australian tourism industry

The measurement of economies of scale in the tourism industry has not been done to this point, as tourism is not a specific industry according to international statistical standards. Among many industries related to tourism, four sectors (accommodation, transport, retail trade and recreational services) across six states and two territories from 1997 to 2007 are studied as they contribute nearly 70% of tourism output in Australia. By comparing regression results from the Cobb–Douglas (C–D) production function and the translog production function, we find that there is evidence of increasing returns in transport, retail trade and recreational services at the industry level. However, accommodation is characterized by constant returns to scale at the industry level. As accommodation is responsible for the biggest share of tourism output, this suggests that overall the tourism sector is not characterized by increasing returns. We also find that the degrees of returns to scale from the C–D and translog production functions are different and that the imposition of input share also influences the empirical results. Both of these factors stress the importance of model specification to the measurement of economies of scale.     

Preferential trade agreements and manufactured goods exports: does it matter whom you PTA with?

This article explores two questions. First, do preferential trade agreements (PTAs) affect manufactured goods exports of developing countries? Second, does it matter for developing countries whom they sign the PTAs with? We find that the answer to both questions is yes. Using bilateral manufactured goods exports data from 28 developing countries during 1978–2005; we find that South–South PTAs have a significantly positive effect on manufactured goods exports. In contrast, no such effect is detected in the case of South–North PTAs. We confirmed the robustness of these findings to estimation methodology, sample selection, time period, zero trade flows and multilateral trade resistance.     

An empirical study of collaborative partnering among enterprises and government organizations for information system outsourcing

Most researches on information systems (IS) outsourcing indicate that public sector decides to outsource information technology (IT) services due to the belief that private vendors offer more cost advantages. This research explores government sectors of outsourcing and focus on the role of relationship for IS-service providers. Quantitative data of 126 questionnaires and 30 IS demonstrate that trust, mutual dependence, equipment investment and information sharing are contributing factors to successful outsourcing long-term partnerships. Information sharing between the service receiver and provider is also vital in terms of equipment investment in long-term partnerships, and is affected by the level of trust that each party holds for the other within the outsourcing process. Conceptual model is useful in explicating important government-business partnering strategies – the model highlights not only the economic benefits that the IS-outsourcing relationship brings based on social exchange theory characteristics, but also suggests many additional relevant elements.     

Estimating gravity equation models in the presence of sample selection and heteroscedasticity

Gravity models are widely used to explain patterns of trade. However, two stylized features of trade data, sample selection and heteroscedasticity challenge the estimation of gravity models. We propose a two-step method of moments (TS-MM) estimator that deals with both issues. The Monte-Carlo experiments show that the TS-MM estimates are resistant to various combinations of sample selection and heteroscedasticity. Moreover, the TS-MM estimator performs reasonably well even when the data generating process deviates from the TS-MM assumptions. We revisit the world trade in 1990 to illustrate the usefulness of the proposed model, with emphasis on the identification of the extensive margin of trade.     

The equilibrium exchange rates of European currencies and the transition to euro

This study estimates the demand system using Japanese micro data and calculates the cost of living index (COLI) to assess the substitution bias in the Consumer Price Index. The estimated bias during the sample period of 1982–2000 is about 0.06 percentage points, which is larger than the estimates calculated from a superlative index. The difference between the COLI and a superlative index can be explained with the upward movements of the average utility level in Japan, since the cost of living for the rich has grown more rapidly than that for the poor.