Marginal and association regression models for longitudinal binary data with drop‐outs: A likelihood‐based approach

Longitudinal data often contain missing observations, and it is in general difficult to justify particular missing data mechanisms, whether random or not, that may be hard to distinguish. The authors describe a likelihood‐based approach to estimating both the mean response and association parameters for longitudinal binary data with drop‐outs. They specify marginal and dependence structures as regression models which link the responses to the covariates. They illustrate their approach using a data set from the Waterloo Smoking Prevention Project They also report the results of simulation studies carried out to assess the performance of their technique under various circumstances.     

How culture influences foreign trade: evidence from the U.S. and China

Using a gravity model of trade and the U.S. and Chinese panel data, I present evidence that supports the views that linguistic links have become more important in foreign trade than geographical proximity and that linguistic influence on trade is more significant in China than in the U.S. The estimated result based on a broad panel of economies shows little overall relation between religious similarity and foreign trade in both the U.S. and China. But there is an indication that the religious dissimilarity tends to retard foreign trade with poor countries and regions and to encourage foreign trade with richer places. I also found that, although religious retardation on foreign trade is more significant in China than in the U.S., religious dissimilarity tends to retard the US export more than that of China; by contrast, it tends to retard the Chinese import more than that of the U.S. At last, the socio-economic implications of the estimated results are discussed.     

应用哲学的理论定位

一种理论 ,不仅有“质”的规定 ,而且有“特性”的规定。哲学语言是晦涩的 ,但在不同的语境和背景中 ,有其他理论不可替代的作用。哲学 ,作为思维的产物和实践的结晶 ,不是无用 ,也不是小用 ,而是大用。哲学发展的重要趋势 ,必将日益显示出哲学的作用。     

一类非线性时滞微分方程的振动性

讨论了非线性时滞微分方程Ｈ（ｔ，ｘ（ｔ），ｘ（ｔ—ｒ）＋ｆ（ｔ，ｘ（ｔ—τ））—ｇ（ｘ（ｔ—σ））＝０的振动性，推广了有关文献的部分结果．     

Robustness of testing the equality of two slopes in simple linear structural relationships

The usual test of the equality of two slopes in a simple structural relation-ship is the test formed from the normal approximation using the Fisher information matrix, assuming two explanatory variables are independent. This paper examines the robustness if the explanatory variables are, in fact, dependent. A more efficient estimator is derived for a matched pair situation.     

对社会主义市场经济内涵的理论思考

自我国确立社会主义市场经济体制改革目标以来,市场经济得到迅速发展,市场活动有序进行,但也存在不少问题。因此,全面准确地把握社会主义市场经济的内涵,对于我们完善社会主义市场经济体制,建立规范的市场经济秩序、实现经济的平稳运行有着重要的意义。     

竞争情报是企业自主创新中的重要元素

论述了竞争情报作为企业自主创新中的重要元素,在企业决策创新、技术创新、管理创新中发挥的重要支撑作用.阐述了企业自主创新建设对竞争情报机构的需求,介绍了企业竞争情报研究的组织结构、工作流程、人员分工及系统构成,分析了我国钢铁企业自主创新面临的主要问题,指出了我国钢铁企业情报机构为促进自主创新做贡献的主要途径及自身的建设发展方向.     

电源抗电磁干扰的研究

通过对电源抗电磁干扰的研究，提出了保证计算机和精密电子设备正常运行的一些有效方法。     

构造地貌分析体系及相关的构造地貌标志

对理论构造地貌学的主要分支古构造地貌、新构造地貌和活动构造地貌各自的特点作了分析对比 ;总结、提出了对构造地貌研究具有普遍意义的几何分析、运动分析和动力分析的构造地貌分析体系 ;列举了相关的构造地貌标志及国内外典型实例     

“方块布依字”及其在布依族宗教典籍传承过程中的作用

“方块布依字”是布依族民间流传的一种仿汉字的记音符号 ,主要通行于宗教职业者群体。布依族宗教经文手抄本中的用字和造字方法主要有四种 ,或用与布依语相同或相近的音来记录该语音 ,或根据布依语词义、用汉语方块字的字符重新造字 ,或用与布依语同义的词来记录 ,或直接用汉字本身来记录。“方块布依字”在布依族宗教典籍及传统文化的传承过程中具有重要的作用。