Towards Uniformly Efficient Trend Estimation Under Weak/Strong Correlation and Non‐stationary Volatility

In this paper, we consider the deterministic trend model where the error process is allowed to be weakly or strongly correlated and subject to non‐stationary volatility. Extant estimators of the trend coefficient are analysed. We find that under heteroskedasticity, the Cochrane–Orcutt‐type estimator (with some initial condition) could be less efficient than Ordinary Least Squares (OLS) when the process is highly persistent, whereas it is asymptotically equivalent to OLS when the process is less persistent. An efficient non‐parametrically weighted Cochrane–Orcutt‐type estimator is then proposed. The efficiency is uniform over weak or strong serial correlation and non‐stationary volatility of unknown form. The feasible estimator relies on non‐parametric estimation of the volatility function, and the asymptotic theory is provided. We use the data‐dependent smoothing bandwidth that can automatically adjust for the strength of non‐stationarity in volatilities. The implementation does not require pretesting persistence of the process or specification of non‐stationary volatility. Finite‐sample evaluation via simulations and an empirical application demonstrates the good performance of proposed estimators.     

都市独生子女特性分析

计划生育政策下的当今都市环境中生存的独生子女群体,其特性大异于前代人,压力源亦异于前人,所思所念以及心理困扰极具特点,进入青春期后特征尤为明显。抓住当今都市独生子女的本质特征,对未来青少年教育的方向及方式具有特殊意义和价值。     

Constrained vs unconstrained labor supply: the economics of dual job holding

This paper develops a unified model of dual and unitary job holding based on a Stone-Geary utility function. The model incorporates both constrained and unconstrained labor supply. Panel data methods are adapted to accommodate unobserved heterogeneity and multinomial selection into six mutually exclusive labor supply regimes. We estimate the wage and income elasticities arising from selection and unobserved heterogeneity as well as from the Stone-Geary Slutsky equations. The labor supply model is estimated with data from the British Household Panel Survey 1991–2008. Among dual job holders, our study finds that the Stone-Geary income and wage elasticities are much larger for labor supply to the second job compared with the main job. When the effects of selection and unobserved heterogeneity are taken account of, the magnitudes of these elasticities on the second job tend to be significantly reduced.     

南社在传播马克思主义中的作用

本文通过对《共产党宣言》两种中译本和《民国日报 <觉悟 >副刊》的解读 ,阐述了近代革命文学社团南社在传播马克思主义方面发挥过的积极作用     

如何成为"最佳雇主"--访翰威特咨询公司

随着社会发展，越来越多的企业意识到“人才”是企业最宝贵的无形资产，吸引和留用具有一技之长的员工已经成为一个棘手的问题。为此，著名的全球HR管理咨询公司———翰威特咨询公司在２００１年推出了“亚洲最佳雇主”调研活动，２００２年他们再次进行了评选活动。争当“最佳雇主”成为企业竞争的一个大方向。如何才能成为“最佳雇主”？这个评选是怎么进行的？评选活动对现实有什么意义？带着这些问题，记者采访了翰威特公司北京地区负责人林靖小姐及其资询顾问。记：据了解，翰威特２００１年在中国开展“最佳雇主”的调研还是第一次…     

The Effects of Spousal Health on the Decision to Smoke: Evidence on Consumption Externalities, Altruism and Learning Within the Household

Married individuals are healthier than single individuals though the reasons are not well understood. Individuals with spouses/or partners are less likely to smoke. We explore the relationship between health and marital status by analyzing three potential channels through which marriage affects smoking, i.e., consumption externalities (one spouse's smoking affects the other spouse's welfare), altruism (one spouse reduces smoking in response to the other spouse's bad health), and learning about risks of smoking from the health experience of one's spouse. We find spousal health does not affect smoking due to altruism or learning within the household but do find evidence for consumption externalities.     

Determinants of female labor force participation: A study of Seoul,South Korea, 1970–1980

This paper investigates the determinants of labor force participation of women living in male-headed households in Seoul, South Korea, at two points in time, 1970 and 1980. Analysis of data from the 1970 and 1980 Korean Population Censuses suggests that both women's educational level and the family economic status determine women's labor force participation in Seoul. Women with middle school education or above are more economically active than those with no education. Women from lower economic backgrounds are almost two to three times more likely to be employed than those in high-status families, controlling for age, number of children under 6, and marital status. However, this pattern is not found among women from the blue-collar wage-working families.An earlier version of this paper was presented at the 1988 meetings of the Population Association of America.     

我国受贿罪概念中的矛盾及其解决

随着经济、社会的发展和立法、司法实践的变化,我国受贿罪概念的内涵及外延一直处于变动不居的过程中.我国1997年刑法典明示了受贿罪的罪名及其内涵、外延,但由此带来了有关受贿罪概念的诸多矛盾.从国际比较的视野审视并分析这些矛盾,有助于勾勒出我国受贿罪立法进一步完善的前景.     

双交错Millitron慢波系统的实验研究

讨论了双交错Millitron慢波系统的设计方法,并采用通过式谐振法对双交错Millitron的色散特性进行了实验研究,给出了实验结果,并和作者所得到的理论结果[4]进行了比较,分析了出现误盖的原因。     

自然价值的进化

人类面临生态困境 ,这与人类价值观密切相关。自然价值的问题是 2 1世纪人们高度关切的根本性问题。为了认识自然价值问题 ,有必要了解自然价值是怎样产生和发展的。自然价值是自然物质生产过程的创造。自然物质生产是历史地发展的 ,自然价值的创造也是历史地发展的。这种历史发展促成自然价值的进化。总的说来 ,它朝着价值不断增殖的方向运动。