Adaptive tests of regression functions via multiscale generalized likelihood ratios

Many applications of nonparametric tests based on curve estimation involve selecting a smoothing parameter. The author proposes an adaptive test that combines several generalized likelihood ratio tests in order to get power performance nearly equal to whichever of the component tests is best. She derives the asymptotic joint distribution of the component tests and that of the proposed test under the null hypothesis. She also develops a simple method of selecting the smoothing parameters for the proposed test and presents two approximate methods for obtaining its P‐value. Finally, she evaluates the proposed test through simulations and illustrates its application to a set of real data.     

TESTING SPHERICITY UNDER A MIXTURE MODEL

The robustness of Mauchly's sphericity test criterion when sampling from a mixture of two multivariate normal distributions is studied. The distribution of the sphericity test criterion when the sample covariance matrix has a non-central Wishart density of rank one is derived in terms of Meijer's G-functions; its distribution under the mixture model is then deduced. The robustness is studied by computing actual significance levels of the test under the mixture model using the critical values under the usual normal model.     

南瓜营养液的生产技术

介绍了南瓜营养液的生产工艺和动物实验效果。     

浅谈高校英语教师所应具备的素质

精读课是英语专业学生的一门主修课.精读教师的素质对教学质量以及大学生素质的培养起着关键性的作用.本文从精度课角度简单分析了高校英语教师应具备的素质--能力素质和思想道德素质.     

论大学英语水平统一测试的优越性

我国现行有两套考试系统用以测试大学英语水平:大学英语46、级考试(CET-4/6)用来衡量非英语专业学生的英语水平,而英语专业48、级(TEM-4/8)考试则用来测评英语专业学生的英语水平。依据Bachman和Palmer语言测试原则,为了保证语言测试的有效性,语言测试任务应该与语言应用任务相对应,这种对应是语言测试的出发点和目的。既然如此,对于非母语的中国大学生而言,就没有必要以英语专业或非英语专业的区分用不同的测试来区分他们的英语水平。从这一点出发,完全可以将现行测试非英语专业学生CET-4/6和测试英语专业学生的TEM-4/8合二为一。问卷调查分析也表明,实行全国大学英语统一测试比分成两套考试系统的英语测试更具优越性。     

浅谈如何提高大学生英语阅读理解能力兼评《全新版大学英语快速阅读》

阅读理解能力是衡量一个人英语水平的重要因素之一,随着社会的发展和大学英语教学改革的大力推进,我们应当进一步加强对大学生阅读理解能力的培养,扩充他们对词汇量的掌握,并使他们了解相关的文化背景,从而达到提高阅读速度的目的。     

我国货币长期中性的实证研究

通过运用动态相关系数和格兰杰因果检验的计量经济学方法，对我国的货币供应量与经济增长、物价变动的相互关系进行研究。通过实证检验发现，我国货币长期内呈现中性，货币供应量的长期变动最终导致物价的同幅度增长，并且根据检验结果提出了相应的政策建议。     

元认知策略与外语学习

本文在介绍元认知内涵的基础上,通过对元认知在阅读理解和听力理解中作用的分析,阐述了元认知在外语学习中的作用和价值,论证了有效的外语学习离不开元认知策略。文章的结尾作者指出外语教学中应培养学生的元认知能力,教学生学会学习,对其进行终身教育并对此提出建议.     

The Robustness of Trend Stationarity: An Illustration with the Extended Nelson-Plosser Dataset

We re-evaluate Andreu and Spanos's findings in favour of trend stationarity by considering the extended Nelson-Plosser data set. This expanded (to 1988) data set includes a period of rather different behaviour compared with the original Nelson-Plosser data used by Andreou and Spanos. We find that Andreou and Spanos's models (with only minor adjustments) exhibit remarable stability over this extended period, and indicate that their conclusions are more robust than they have shown.     

企业的合约经济理论探索和统计检验

对企业本质的认识是微观经济学中的一个重要问题,其对中国的国企改革有着重要意义。本文中,我们对企业的合约本质进行了经济理论探索和统计检验,并突出关注企业的激励合约问题。