RGAN-EL: A GAN and ensemble learning-based hybrid approach for imbalanced data classification     

《Information processing & management》2023,60(2):103235

Imbalanced sample distribution is usually the main reason for the performance degradation of machine learning algorithms. Based on this, this study proposes a hybrid framework (RGAN-EL) combining generative adversarial networks and ensemble learning method to improve the classification performance of imbalanced data. Firstly, we propose a training sample selection strategy based on roulette wheel selection method to make GAN pay more attention to the class overlapping area when fitting the sample distribution. Secondly, we design two kinds of generator training loss, and propose a noise sample filtering method to improve the quality of generated samples. Then, minority class samples are oversampled using the improved RGAN to obtain a balanced training sample set. Finally, combined with the ensemble learning strategy, the final training and prediction are carried out. We conducted experiments on 41 real imbalanced data sets using two evaluation indexes: F1-score and AUC. Specifically, we compare RGAN-EL with six typical ensemble learning; RGAN is compared with three typical GAN models. The experimental results show that RGAN-EL is significantly better than the other six ensemble learning methods, and RGAN is greatly improved compared with three classical GAN models.  相似文献   

Measuring Textbook Content Coverage: Efficient Content Analysis with Lesson Sampling     

Jiahui Zhang  Leland S. Cogan  William H. Schmidt 《Educational Measurement》2020,39(2):74-84

This study addresses measurement issues around a standards-based content analysis of mathematics textbooks’ coverage of standards for use in large-scale monitoring of standards implementation as proposed in a 2013 report by the National Research Council. An earlier study produced an exhaustive content analysis of textbooks using the 2012 Common Core State Standards for Mathematics. This yielded an accurate and reliable portrait of a textbook's coverage of standards. However, such an in-depth analysis is not feasible for large-scale standards-implementation monitoring in which a large number of textbooks may need to be analyzed. To provide such a portrait with sufficient accuracy while also substantially reducing the associated resources needed to produce such a portrait, a simulation study was conducted with the exhaustively coded database to compare different sampling schemes. Results indicated that sampling 1 day from each week and coding the corresponding lessons led to sufficiently accurate representations of the overall content of the textbook. The results provide empirical evidence for large-scale standards-based content analyses of mathematics textbooks for monitoring standards implementation which could be adapted for other subject areas.  相似文献   

信息技术教育的现状与展望   总被引：1，自引：1，他引：1  

王国钧  吴孝燕  邵斌 《湖州师范学院学报》2003,25(3):112-116

在对浙江省湖州、嘉兴两市部分中学的信息技术学科教学进行抽样调查的基础上，从课程设置、教材使用、教学设备、师资力量等方面分析了中学信息技术学科教学的现状，并利用统计数字揭示了该学科教学目前存在的问题，最后对该学科教学的发展前景作了进一步的探讨。  相似文献   

美国大学终身聘任后评审制政策的网络调查问卷设计及实施     

李阳琇  曾德超 《比较教育研究》2006,27(2):57-61

近十多年来,终身聘任后评审政策在美国掀起了一场运动,引起了广泛关注.但目前国内研究还较少见,尤其定量研究更为缺乏.本文尝试通过网络调查问卷的定量研究来进行.从美国的研究/博士型、硕士型共862所大学总体中,采用分层随机抽样法,抽取公、私立大学共432所为样本,每所大学选择行政官员和教授各1位,直接进行跨国网上问卷调查.本研究表明,采用网络问卷调查法进行外国教育研究是一种成功的研究方式.  相似文献   

顶空进样—毛细管柱气相色谱法分析啤酒的香味组分   总被引：1，自引：0，他引：1  

刘小玲  梁奇峰 《嘉应学院学报》2005,23(3):33-35

介绍了采用毛细管柱气相色谱法分析测定啤酒中的微量挥发性香味组分.以高纯N2(99.999%)作为载气,并结合自动顶空进样技术,对啤酒中的12种微量挥发性香味组分进行定性和定量分析.结果表明:变异系数除乙醛与辛酸乙酯外均小于5%,回收率均在90%以上.该法具有较好的重现性和准确度.  相似文献   

电力系统采样频率自适应预测算法   总被引：1，自引：0，他引：1  

朱安福  苏涛  李云飞 《渭南师范学院学报》2005,20(2):30-32

针对电力系统中频率变化导致的数据采集和测量误差,文章提出一种对电力系统进行交流采样的一种自适应频率预测算法,为采用DSP技术准确估计交流信号的采样频率提供了可行的计算方法。  相似文献   

多抽样率信号处理理论及其应用研究     

周翠  王路 《教育技术导刊》2007,(21)

多抽样率信号处理是建立在单抽样率信号处理基础上的一类信号处理。在传输信号时,由于语音、图象、视频信号的抽样中心频率相差很大,所以需要以多种抽样频率来对信号采样来满足各种传输类型的需要。探讨了改变抽样频率的两种方式-抽取和插值的基本原理,着重探讨了整数倍抽取和内插在数字语音系统中的应用。  相似文献   

大学生恋爱情况调查   总被引：3，自引：0，他引：3  

潘昕  赵凯  吴薇薇  管颖智  韩云 《中国地质教育》2006,15(2):115-116,120

当部分高校宣布允许在校大学生结婚的规定后,社会各界反响强烈,大学生恋爱再次受到普遍关注。针对中国地质大学(北京)学生对恋爱的态度与正确恋爱观是否已经形成等问题,我们利用分层抽样方法,从恋爱状况、恋爱动机、恋爱态度、恋爱与学习关系等四个方面分析我校大学生的恋爱观。分析表明:在校学习期间,大学生对于是否涉足爱河应该持谨慎态度。  相似文献   

Missing children in educational research: investigating school-based versus household-based assessments in India     

Melissa Rae Goodnight  Savitri Bobde 《比较教育学》2018,54(2):225-249

Including all children in large-scale educational studies is a pressing concern. Omitting certain types of children from studies can lead to skewed findings that promote inaccuracies about learning levels or educational quality. Increasingly, assessments are a method for investigating the quality of education systems, but national assessments are typically conducted in classrooms and may fail to accurately represent a country’s full range of children. Alternatively, households can be a site for testing or collecting data on children’s learning. Analysing the quantitative data from two studies in India that use both household-based and school-based methods alongside data from Government of India sources, the issues with child representation in school-based assessments are examined, and the benefits of household-based research as an alternative are explored.  相似文献   

浅谈现行统计调查存在的问题及建议     

刘冬 《商洛师范专科学校学报》2006,20(2):127-128

随着我国政治经济形势的发展，党和国家决策需要统计部门提供的数据越来越多。依靠以往已实行的普查、抽样调查等方法进行统计数据收集，已不能适应形势发展之需，因此，对统计调查中存在的问题必须进行分析，找出解决这些问题的办法。  相似文献