The adequacy of asymptotic approximations in the near-integrated autoregressive model with dependent errors

We consider the normalized least squares estimator of the parameter in a nearly integrated first-order autoregressive model with dependent errors. In a first step we consider its asymptotic distribution as well as asymptotic expansion up to order O_p(T⁻¹). We derive a limiting moment generating function which enables us to calculate various distributional quantities by numerical integration. A simulation study is performed to assess the adequacy of the asymptotic distribution when the errors are correlated. We focus our attention on two leading cases: MA(1) errors and AR(1) errors. The asymptotic approximations are shown to be inadequate as the MA root gets close to −1 and as the AR root approaches either −1 or 1. Our theoretical analysis helps to explain and understand the simulation results of Schwert (1989) and DeJong, Nankervis, Savin, and Whiteman (1992) concerning the size and power of Phillips and Perron's (1988) unit root test. A companion paper, Nabeya and Perron (1994), presents alternative asymptotic frameworks in the cases where the usual asymptotic distribution fails to provide an adequate approximation to the finite-sample distribution.     

流动性约束下我国居民消费行为的二元结构与地区差异

本文构建了状态空间模型和跨省面板数据模型,就不确定性和流动性约束等对我国居民消费行为影响进行比较分析,结果表明:1978年以来,收入的不确定性对城镇居民消费行为的负面影响要大于农村居民;城镇居民面临的流动性约束相对小于农村居民;城镇居民面对利率的替代效应要大于收入效应,而农村居民与之相反。1995年以来,收入和支出的不确定性对我国居民整体消费行为的影响并不显著,但与东中部地区居民消费变动正相关;我国居民消费面临的流动约束整体来看并不严重,但中部地区居民相对而言面临更强的流动性约束。     

新型农村养老保险试点调查分析——以某市农村为例

中国农村地区由于受经济发展水平的限制以及政策因素的影响,养老保险事业长期处于停滞状态。为解决农村地区养老问题,中国于2009年开展新型农村养老保险试点。在制度实施的过程中,不论是制度设计本身还是制度运行都存在着一定的问题。根据湖北省某市试点村的抽样调查结果显示,在新农保实施过程中进一步加大政策宣传、加大财政补贴力度、加强监督管理、完善养老保险立法是完善新型农村养老保险制度的关键所在。     

刍议环境保护固定资产的核算

文章结合我国企业会计制度的特点和环境保护法律法规的要求,从不同的角度对环境保护固定资产进行分类,并对环境保护固定资产的折旧、减值及报废等核算事项进行了初步的讨论。     

Distribution of residual autocorrelations for multiplicative seasonal ARMA models with uncorrelated but nonindependent error terms

In this paper, we consider portmanteau tests for testing the adequacy of multiplicative seasonal autoregressive moving‐average models under the assumption that the errors are uncorrelated but not necessarily independent. We relax the standard independence assumption on the error terms in order to extend the range of applications of the seasonal autoregressive moving‐average models. We study the asymptotic distributions of residual and normalized residual empirical autocovariances and autocorrelations under weak assumptions on noise. We establish the asymptotic behavior of the proposed statistics. A set of Monte Carlo experiments and an application to monthly mean total sunspot number are presented.     

An empirical analysis of international labour migration in the Philippines

This study empirically investigates the impact of economic, demographic, and political factors on the size of emigration from the Philippines. In 2007, overseas workers from the Philippines sent remittances in excess of US$14 billion annually to their families back home. Although these remittances are an important source of foreign exchange and play an important role in economic development, the determinants of emigration in the Philippines are not well established. A simple unrestricted error correction model of migration was specified and estimated using data spanning the period 1975–2005. Results indicate that the level of unemployment, adult literacy and population density are the key determinants of emigration in the Philippines. The result also indicates that government instability impacts negatively on emigration in the Philippines. The policy implications of the results are discussed.     

A new method for measuring congestion in data envelopment analysis

In data envelopment analysis (DEA), there are two principal methods for identifying and measuring congestion: Those of Färe et al. [Färe R, Grosskopf S. When can slacks be used to identify congestion. An answer to W. W. Cooper, L. Seiford, J. Zhu. Socio-Economic Planning Sciences 2001;35:1–10] and Cooper et al. [Cooper WW, Deng H, Huang ZM, Li SX. A one-model approach to congestion in data envelopment analysis. Socio-Economic Planning Sciences 2002;36:231–8]. In the present paper, we focus on the latter work in proposing a new method that requires considerably less computation. Then, by proving a selected theorem, we show that our proposed methodology is indeed equivalent to that of Cooper et al.     

关于建筑监理体系建设的一些探讨

随着国家经济的快速发展,各行各业都在不断地进步和创新以适应时代的脚步,建筑作为国之富强的一项外在体现,应该更加的加强建筑的质量,完善建筑监理体系,建设利国利民的高质量建筑,下面就关于建筑监理体系建设作出一些简单的讨论。     

城市部件数据建库研究

本文在分析数字化城市部件空间数据及模型基础上,通过对基础地理信息数据的调用、单元网格的绘制、建库与更新机制等方面的介绍,探讨了数字化城市管理系统中基础数据的建立方法。