Teaching ‘Instant Experience’ with Graphical Model Validation Techniques

Graphical model validation techniques for linear normal models are often used to check the assumptions underlying a statistical model. We describe an approach to provide ‘instant experience’ in looking at a graphical model validation plot, so it becomes easier to validate if any of the underlying assumptions are violated.     

土地利用规划中“迁村并点”的公众参与——以北京市海淀北部地区为例

论文探讨了土地利用规划中村庄迁并工作的公众参与方法、结果和结论。首先,运用自助法(Bootstrap)抽取了北京市海淀北部地区15个村的150家农户,然后通过问卷调查的形式让农民参与到土地利用规划中村庄迁并方案的制定之中。问卷调查的内容主要涉及到了农村村民的基本情况、居住现状,村民对土地利用规划中村庄迁并模式、房屋拆迁安置方式的看法等几个方面的内容。问卷调查的结果表明：①64.67%的农民对于目前的居住现状表示非常满意或比较满意,表示不太满意和很不满意的只有12.00%; ②38.90%的农民表示愿意居住楼房,而不愿意居住楼房的农民比例则达到61.10%;随着文化程度的增加、年龄的降低、收入的降低,农民愿意居住楼房的比例逐渐上升; ③农村房屋拆迁后,希望得到货币、房屋和另行审批宅基地安置方式的农民比例分别为20%、32.94%和44.71%;假如农民失去耕地,56.94%的农民希望政府帮助解决社会保险,25%的农民希望解决就业,其他选择较少。由此,我们可以得出以下结论：①村庄的迁并工作应该谨慎进行; ②村庄的迁并模式应该多元化,不应过分强调居住楼房; ③房屋拆迁安置方式应自主化,征地应社会保障先行。     

A Comparison of Three Approaches to Electronic Media Diaries

This project compared the richness of reporting and reflection of three approaches to electronic media diaries. For 1 week, 145 students were randomly assigned to keep daily diaries about their media use and perceptions of media content using one of three methods: (a) a traditional daily journaling approach conducted online, (b) an experience sampling method (ESM) approach that combined daily journaling with multiple daily message prompts, and (c) an approach that combined online peer-group discussion with online daily journaling. The goal was to determine if the supplementary diary activities yielded more detailed, emotive, and cognitive responses. Diary content was analyzed using traditional manual content analysis and linguistic software. Results indicated that the ESM condition elicited less cognitive- and affective-oriented language than the other conditions. The group discussion condition evidenced some advantage over the diary-only group in terms of number of media channels and specific content mentioned.     

What Divisor for the Sample Variance?

Simulation is used to show why the divisor in the sample variance is n, - 1. Choice of the divisor for the sample standard deviation is also discussed.     

The burnt matchstick

In an informal study, two versions of a story involving probability are introduced to undergraduates. The findings reveal that students have troubles detecting equal probabilities in a sampling scheme without replacement in which no information on earlier draws is available.     

提高采样频率实现随机共振用于高频信号检测

针对随机共振仅适合于低频信号的约束,对随机共振技术运用于强噪声背景下的高频信号检测进行研究,提出提高采样频率的方法,使高频信号变换成低频信号．数值仿真表明,此方法检测单频信号效果显著,检测调幅信号是有效的．     

基于CRP模型的评论热点挖掘研究修正版

鉴于现在人们习惯在网络上表达自己的产品情感,网络评论变得繁多而杂乱,文章提出应用中餐馆模型(CRP)来挖掘用户评论热点,此方法克服了应用LDA模型挖掘用户评论热点方法不能自动确定热点话题的数目的问题,CRP模型不仅能自主发现评论热点及其更新的评论,还能准确确定出热点评论。以26 157篇餐馆评论为数据样本,实验证明该方法能得到了较好的效果。     

Estimating audiences: sampling in television and radio audience research

Cultural consumption is problematic from a number of different perspectives, but certain responses from producers, regulators and commentators depend on the measurement of consumption according to quantitative and qualitative parameters. The reliability of the data can vary widely, not least because in certain areas consumption is invisible to those who would measure it, and so they must make estimates based on assumptions about methodology and sampling techniques. Whereas in auditoria, turnstiles may quite accurately quantify footfall through the premises, and sale or return inspires high levels of confidence in circulation figures for certain types of publication, broadcasters perform to intangible audiences who can be neither counted nor observed en masse. This article considers the appropriateness of sampling techniques used to produce audience research data for the broadcasting industries, for the programmers and advertisers who need detailed ‘knowledge’ about their audiences. It draws on the contextualization in Cultural Trends 45 (Starkey, 2003), which examined the debate around competing methodologies using either innovatory electronic devices for the measurement of consumption or more traditional human recall. The article raises important questions for those who use sampling techniques in the cultural sector and those who would interpret their data.     

论有机合成中的选择控制方法

论述了在有机合成中选择控制的重要性,结合教学实践归纳总结了各种选择控制的策略和办法。