基于非参数秩和检验的B站电影评分系统研究

该文通过爬虫代码搜集了当前B站电影栏目列表中的所有电影(约1000部),同时爬取每部电影下的所有评分数据(约65万条),每条评分数据包含评分时间与用户的ID信息。通过非参数统计中的Mann-Whitney秩和检验对搜集的数据进行分析和研究,结果表明:B站电影栏目中第一次评分人员的比例会对评分产生显著影响。同时参考美国IMDb贝叶斯加权统计算法中只收录“老用户”评分的处理方式,对B站评分系统提出建议,使评分能更加客观、全面地为观众提供参考。     

连接字段真的能生成题名检索点吗

当前图书馆界对连接字段有一种流行的看法,认为可利用该字段生成题名检索点。本文分析了导致这种观点产生的原因,并分别从连接字段的结构角度和利用反证法对这种观点的正确性进行了论证,结论是连接字段并不具有生成题名检索点的功能。     

从三角形的内角和谈起——例说高等数学和初等数学的联系

从三角形的内角和谈起,以几个例题说明高等数学与初等数学的联系.     

基于"NSQ网教视讯通"的混合教学模式的探索

本文介绍了基于“NSQ网教视讯通”的混合教学模式的探索,这种探索考虑怎样在主要以建构主义教学理论指导的远程教学中吸取行为主义教学模式在教学监控、反馈上的优点,并介绍了基于“NSQ网教视讯通”教学模式是怎样实现这种教学监控、反馈的。     

改进双因素方差分析中离差平方和计算方法的研究

本研究对双因素方差分析离差平方和的计算公式做了较大改进，并对新建立的公式进行了推导和验证运算，在有重复有交互作用的离差平方和的计算方法上有所突破，适用于具有统计功能的计算器和计算机上操作使用（无需编程）。     

在协方差分析中离均差乘积和计算方法的改进研究

针对协方差分析中离均差乘积和的计算方法较为复杂这一难点,根据大多数人掌握在具有统计功能的计算器或计算机中计算相关系数比较便利的特点,应用协方差分析中离均差乘积和的计算公式与积差相关系数的计算公式的相同部分,利用代入法和换算法推导出新的离均差乘积和的计算公式。对新建立的公式进行了推导和验证运算,均准确无误。并用相同的实例证明原公式与新公式的计算结果完全相同,且新公式简捷,有效及实用。     

把学习的主动权交给学生--化学复习点滴体会

在化学复习课中，学生的参与是调动他们主动性、积极性的好方法。     

Generalized Linear Factor Score Regression: A Comparison of Four Methods

Factor score regression has recently received growing interest as an alternative for structural equation modeling. However, many applications are left without guidance because of the focus on normally distributed outcomes in the literature. We perform a simulation study to examine how a selection of factor scoring methods compare when estimating regression coefficients in generalized linear factor score regression. The current study evaluates the regression method and the correlation-preserving method as well as two sum score methods in ordinary, logistic, and Poisson factor score regression. Our results show that scoring method performance can differ notably across the considered regression models. In addition, the results indicate that the choice of scoring method can substantially influence research conclusions. The regression method generally performs the best in terms of coefficient and standard error bias, accuracy, and empirical Type I error rates. Moreover, the regression method and the correlation-preserving method mostly outperform the sum score methods.     

Fibonacci与Lucas数的一个求和公式

提出并证明了Fibonacci与Lucas数的一个求和公式。     

Predicting and recommending collaborations: An author-, institution-, and country-level analysis

This study examines collaboration dynamics with the goal to predict and recommend collaborations starting from the current topology. Author-, institution-, and country-level collaboration networks are constructed using a ten-year data set on library and information science publications. Different statistical approaches are applied to these collaboration networks. The study shows that, for the employed data set in particular, higher-level collaboration networks (i.e., country-level collaboration networks) tend to yield more accurate prediction outcomes than lower-level ones (i.e., institution- and author-level collaboration networks). Based on the recommended collaborations of the data set, this study finds that neighbor-information-based approaches are more clustered on a 2-D multidimensional scaling map than topology-based ones. Limitations of the applied approaches on sparse collaboration networks are also discussed.