Is There Persistence in the Impact of Emergency Food Aid? Evidence on Consumption, Food Security, and Assets in Rural Ethiopia

We identify the impact of emergency food aid programs after the 2002 drought in rural Ethiopia on future welfare. Based on a difference-in-differences matching estimator, participation in food-for-work increases growth in total consumption and food consumption eighteen months after the drought. Separately, receiving free food raises growth in food consumption, but, surprisingly, negatively impacts food security. Food-for-work benefited households in the middle and upper tail of the consumption distribution, while the better-targeted free food program benefited the poorest. Evidence suggests these impacts demonstrate accumulated and persistent effects of food aid received in the first twelve months after the drought.     

土地流转对农户贫困脆弱性的影响研究

研究目的:探究土地流转对农户贫困脆弱性的影响,为防范农户陷入贫困和解决农村贫困提供理论和实证依据。研究方法:本文借助2016年湖北省1682个农户实地调查数据,基于倾向得分匹配法(PSM)和回归方程的Shapley值分解法,分别考察国定贫困线、1.9美元贫困线和3.1美元贫困线下不同类型土地有无转出和转出面积对农户贫困脆弱性的影响。研究结果:土地转出能够显著降低农户的贫困脆弱性,且农户贫困脆弱性随着转出土地面积的增加而降低;从土地转出的异质性来看,水田转出对缓解农户贫困脆弱性的效果更为明显,旱地转出的效果次之。研究结论:应进一步加快农村土地流转,释放农村剩余劳动力,不断增加农户收入,从而降低农户贫困脆弱性。     

国际场外衍生品电子交易确认平台发展趋势及启示

交易确认是交易后处理过程中的重要环节,可以通过电话、邮件、传真等人工形式进行,也可以通过电子交易确认平台完成。由于人工确认的不及时可能导致交易失败从而增大交易成本和风险,近年来电子交易确认在国际O T C衍生品市场上得到了广泛的应用。文章梳理和区分了交易确认的概念,回顾了电子确认平台的发展历程,并在此基础上对电子交易确认平台的发展趋势进行了展望。     

施工总承包特级企业市场交易资质匹配研究

施工总承包特级企业是我国建筑业企业的龙头,其市场行为是否与其自身的资质和能力相匹配,影响建筑市场秩序和建筑行业的健康发展.文章在界定建筑业企业市场交易资质匹配概念的基础上,选取"中标次数"、"中标率"、"中标总金额"、"平均单位标段强度"、"中标次数修正指标"、"中标次数百分比修正指标",以及"中标金额百分比修正指标"和"平均单位标段强度修正指标",建立了相应的施工总承包特级企业市场交易资质匹配度测算模型,并利用2009年南京市建设工程交易数据进行了实证分析.测算结果与企业实际市场表现基本一致,表明模型建立科学,模型测算分值(QMI)能够反映企业在某一特定市场交易中的资质匹配状况.     

Waiting time probabilities in the M/G/1 + M queue

We consider an M/G/1 queueing system where the customers may leave the queue if their services do not commence before an exponentially distributed random time. The (conditional) offered waiting time distribution is approximated by a gamma distribution via matching the first and second moments of the actual waiting time. A simulation study is conducted to assess the accuracy of the approximation and it reveals that the approximation performs satisfactorily under general conditions on service time distributions.     

河北省高校毕业生就业供需匹配研究

毕业生就业实质是高校人才培养与社会需求匹配的过程。本文将河北省高校毕业生就业问题放在河北省产业结构优化升级的大环境中来进行阐述和分析,从河北省高校就业结构出发分析其就业结构偏离度。进而根据河北省高校毕业生就业专业相关性不高、主要集中在民营企业、灵活就业居多、就业稳定性差等就业现状,从市场需求出发,着眼于高校教育供给、毕业生就业能力培养和畅通就业市场人才流动三个方面,分析河北省高校毕业生培养类型、学历层次、学科专业、通用就业能力和劳动力市场分割等方面与市场需求之间存在的矛盾。基于此,从三个方面提出破解河北省高校毕业生就业市场供需矛盾的思路：一是对河北省高校毕业生培养方向进行调整,二是加强大学生就业能力培养,三是加快京津冀劳动力市场一体化建设进程。     

协议分析在入侵检测系统中的应用

模式匹配是入侵检测系统中常用的方法,这种算法速度快、效率高。但是单独使用模式匹配方法来检测入侵还存在一些弊端。为此,给出了一种高效、可靠的检测方法,即结合使用协议分析与模式匹配的分析方法,同时给出一个例子来说明协议分析的实现过程。     

THE ESTIMATED EFFECT OF CATHOLIC SCHOOLING ON EDUCATIONAL OUTCOMES USING PROPENSITY SCORE MATCHING

This paper examines the effect of attending a Catholic high school on educational outcomes. The statistical analysis is based on data obtained from the US National Educational Longitudinal Study. Using propensity score matching methods to control for selection bias, we find that Catholic schooling improves maths test scores, with stronger effects for males than for females, but appears to have little effect (if any) on reading scores. Catholic schooling also raises high school graduation rates and substantially increases the likelihood of enrolment in a 4‐year college. Use of the difference‐in‐difference method suggests that the effect of Catholic schooling on changes in maths scores is more muted, though still statistically significant.     

Markov equilibria in dynamic matching and bargaining games

Rubinstein and Wolinsky [Rev. Econ. Stud. 57 (1990) 63] show that a simple homogeneous market with exogenous matching has a continuum of (non-competitive) perfect equilibria; however, the unique Markov-perfect equilibrium of this model is competitive. By contrast, in the more general case of heterogeneous markets, even the Markov property is not enough to guarantee the perfectly competitive outcome. We define a market game that allows for heterogeneous values on both sides of the market and exhibit a number of examples of (non-competitive) Markov-perfect equilibria, with and without discounting. Unlike the homogeneous case, these equilibria allow for inefficient trades and for trade at non-uniform prices. The non-competitive equilibrium may be unique.     

Construction of D-optimal s 1 × s 2 × s 3 factorial designs using graph theory

In this paper, the maximum determinant of the associated 0-1 matrix in D-Optimal saturated main effect plans for 3× s_2 × s_3 factorials, is derived by the use of Graph theory and Combinatorics. The present work is related to a problem suggested by Chatterjee and Narasimhan (2002). Using the theoretical results, we also give the designs for s₃≥s₂ + 1. This research was supported by the State Scholarships Foundation of Greece.