我国农村人口出生性别比偏高的动力机制研究

B超的滥用、强烈的男孩偏好以及对非法流产行为监控的失效共同构成我国出生性别比偏高的充要条件,三者中任一条件不满足都不可能出现出生性别比偏高。尽管B超发明和滥用前出生性别比并没有异常,但也不能说出生性别比偏高与受教育水平、传统文化等因素无关。事实上,这些因素通过影响男孩偏好和B超的可获得性而影响出生性别比。由此出发,促进出生性别比回复正常,短期内应标本兼治,以治标为主———坚决禁止B超的滥用,关键是加强立法和管理;长期内则必须治本———消除男孩偏好,关键是加速农村城市化。     

吕祖谦朱熹共讲月泉说质疑

明末以来的不少文献资料如《嘉靖浦江志略》、《乾隆浦江县志》都记载,吕祖谦、朱熹曾一同讲学于浙江浦江县的月泉书院,即第一次在宋孝宗乾道年间,第二次在孝宗淳熙八年.但如果就古代文献所提供的这两个时间来考察,则所谓吕祖谦、朱熹一起讲学月泉的事实属子虚乌有,属以讹传讹,不能信以为真.而之所以会产生这种误传,与此两人一个作为儒学正宗,一个被公认为浙东学派的实际开创者不无关系.这一事实也反映出一些旧地方志乘不一定值得信赖.     

区域经济增长与环境质量演进关系模型研究——基于环境库兹涅茨曲线

从社会福利最大化角度出发,通过设定物品消费偏好指数,建立两物品模型,推导出了区域环境最佳投资水平;在此基础上,从理论上证明了环境库兹涅茨曲线存在的依据以及在环境质量最低点和环境质量发生根本性好转的转折点的社会总投资水平。最后,得出环境质量演化过程曲线取决于社会经济发展状况,它与非环境物品生产函数和排污生产函数的技术参数、居民收入水平以及对环境物品和非环境物品的消费偏好以及国民收入分配政策等有关,而非仅仅与经济增长状况有关。     

幽独自得的硕人——再释《诗经·卫风·考》

《诗经·卫风·考》是隐士抒怀明志之作。诗篇具体生动而全面地描绘了隐士的生活情趣,突现其幽独之乐、拔俗之标、坚隐之节,表现出旷达闲适、和乐静穆的情调,给人留下深刻印象,具有感人的艺术魅力,对后世隐逸文学作品具有深远的影响。     

浙江省全县域人才环境竞争力评价研究——基于84个区县市的调查

从经济水平、事业科创、社会文化、生活保障四个维度,结合县域经济的特点,构建县域人才环境竞争力评价指标体系,运用因子分析和聚类分析的方法评价与分析浙江省84个区县市。通过因子分析得出各区县市人才环境竞争力的综合排名与评价,发现浙江省各区县市人才环境竞争力呈现北强南弱、东强西弱的总体格局,各地市内区县市间也存在较大的差异性。通过聚类分析将竞争力形态较为相似的区县市归类并总体分为的四种类型。基于两种分析的结果,提出了若干建议:建设人才环境竞争力提升示范区、推进协作发展、实现优势互补、加强适时监测评价等,依托浙江省高质量发展建设共同富裕示范区的政策优势,促进地区人才环境竞争力共同提升。     

沿边开放与区域经济增长——基于制度变迁的研究

主要关注沿边开放地区的制度变迁对经济增长的影响效应,基于2003—2018年我国8个沿边省份的73个地级城市面板数据,运用双向固定模型、分位数回归、门槛效应模型和中介效应模型进行科学严谨的研究,主要结论有:(1)沿边开放的制度变迁有利于促进区域经济增长,并且在一系列稳健性检验后,该结论仍然成立;(2)分位数回归发现,随着经济增长率分位数点的增加,沿边开放地区的制度变迁对经济增长的促进作用呈现出先变小、再变大的U型特征;(3)门槛效应发现,随着制度质量水平提升,沿边开放地区制度变迁对区域经济增长的作用效果呈现出边际递减的特征;(4)异质性发现,城镇化方面,高城镇化的沿边地区制度变迁促进经济增长的作用大于低城镇化地区。创新水平方面,在高创新水平地区,沿边开放的制度变迁显著促进区域经济增长,而低创新水平地区不显著;(5)中介效应发现,沿边开放地区的制度变迁主要通过外商直接投资和固定资产投资增加,进而促进区域经济增长,其中固定资产投资起到完全中介作用。结论为进一步深化改革开放、加快沿边开放地区发展和构建开放型经济新体制提供一定经验依据和政策支持。     

Effects of fixed costs in two-person sequential bargaining

Rubinstein (1982) considered the problem of dividing a given surplus between two players sequentially, and then proposed a model in which the two players alternately make and respond to each other's offers through time. He further characterized the perfect equilibrium outcomes, which depend on the players time preferences and order of moves. Using both equal and unequal bargaining cost conditions and an unlimited number of rounds, two experiments were designed to compare the perfect equilibrium model to alternative models based on norms of fairness. We report analyses of final agreements, first offers, and number of bargaining rounds, which provide limited support to the perfect equilibrium model, and then conclude by recommending a shift in focus from model testing to specification of the conditions favoring one model over another.     

Dynamic reliability models with conditional proportional hazards

A dynamic approach to the stochastic modelling of reliability systems is further explored. This modelling approach is particularly appropriate for load-sharing, software reliability, and multivariate failure-time models, where component failure characteristics are affected by their degree of use, amount of load, or extent of stresses experienced. This approach incorporates the intuitive notion that when a set of components in a coherent system fail at a certain time, there is a jump from one structure function to another which governs the residual lifetimes of the remaining functioning components, and since the component lifetimes are intrinsically affected by the structure function which they constitute, then at such a failure time there should also be a jump in the stochastic structure of the lifetimes of the remaining components. For such dynamically-modelled systems, the stochastic characteristics of their jump times are studied. These properties of the jump times allow us to obtain the properties of the lifetime of the system. In particular, for a Markov dynamic model, specific expressions for the exact distribution functions of the jump times are obtained for a general coherent system, a parallel system, and a series-parallel system. We derive a new family of distribution functions which describes the distributions of the jump times for a dynamically-modelled system.     

A Population Approach to Analysis of Variance Models

Several authors have contributed to what can now be considered a rather complete theory for analysis of variance in cases with orthogonal factors. By using this theory on an assumed basic reference population, the orthogonality concept gives a natural definition of independence between factors in the population. By looking upon the treated units in designed experiments as a formal sample from a future population about which we want to make inference, a natural parametrization of expectations and variances connected to such experiments arises. This approach seems to throw light upon several controversial questions in the theory of mixed models. Also, it gives a framework for discussing the choice of conditioning in models     

同种商品不同月份期货组合风险评价模型研究及应用

以期货合约的每一交易日的对数涨跌率来反映市场风险,借助VaR风险价值法,运用加权核估计技术(WKDE)和指数加权滑动模型(EWMA),建立了基于期货组合中持有头寸不同且可以进行风险对冲的期货组合市场风险非线性叠加评价模型,解决了同种商品、不同月份期货组合每一交易日最大损失的确定问题,并通过实证研究验证了模型的实用性.该模型的特点一是借助WKDE法预测组合中单个合约每一交易日涨跌率最大日亏损值,充分体现了期货合约涨跌率的实际走势,使VaR估计更加精确.二是通过动态迁移相关系数矩阵的计算保证了模型的精确性.采用EWMA模型预测动态变化的方差-协方差矩阵,从实证的角度得到更精准的动态迁移相关系数矩阵.三是考虑了组合中多头和空头不同头寸之间的风险对冲,避免了实际中期货组合风险的线性相加而造成放大风险或减少风险的不准确性,从而能较好地保证了模型的预测精度及准确性.四是通过基于风险非线性叠加建立的期货组合风险评价模型解决了SPAN系统中期货组合风险的线性叠加问题,从而得到更合理的组合风险预测值.