分层抽样下多项选择敏感问题随机抽样调查方法及应用     

邱赛兵  唐波 《娄底师专学报》2013,(2):39-41

目的是为多项选择敏感性问题提供科学的、精度更高的随机抽样调查方法及其统计量的计算公式,设计出多项选择敏感问题分层抽样下的随机抽样调查模型,并推导出在此模型下总体比例的估计量及其估计方差的计算公式,计算出敏感属性比例95％的置信区间。并在湖南城市学院本科学生考试作弊情况的实例调查中取得了信誉度较高的应用效果。  相似文献   

基于MAX125的多通道同步采样数据采集系统   总被引：2，自引：0，他引：2  

涂水林 《常熟理工学院学报》2004,18(2):56-58

介绍了一种基于MAX125的多通道同步采样数据采集系统.该系统由89C51单片机作为控制核心完成控制功能.文中较详细地介绍了本系统的硬件电路设计和软件设计方法.  相似文献   

Universal bound on sampling bosons in linear optics and its computational implications     

Man-Hong Yung  Xun Gao  Joonsuk Huh 《国家科学评论(英文版)》2019,6(4):719

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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   

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   

基于网络的入侵检测系统数据包采样策略研究   总被引：2，自引：0，他引：2  

王卫平  朱卫未  陈文惠  梁樑 《中国科学院研究生院学报》2006,23(4):534-542

入侵检测是信息安全研究的重要组成部分，基于网络的入侵检测系统通过详细分析计算机网络中传输的网络数据包进行入侵检测。由于检测速率与数据包采集速率不匹配，以及检测所需成本的限制，在收集用于检测的网络数据包时，必须选择有效的采样策略。本文引入博弈模型框架上的原始入侵数据包采样策略，在此基础上再进行分析和扩展。本文针对单一采样策略的缺陷与不足，引入风险管理的思想来分析在决策者不同效用偏好情况下的采样策略选择问题，并且通过具体的实例，说明了基于风险差异的采样策略选择的有效性。  相似文献   

河南省高职高专大学英语师资队伍状况抽样调查     

郭爱先 《平原大学学报》2007,24(6):73-75

教师是大学英语教学改革成败和教学质量高低的决定因素。课题组对河南省高职高专院校的大学英语师资状况进行了抽样调查,结果显示:教师数量严重不足;教学工作量过大;教师队伍性别、年龄、学历、职称等结构不合理;教科研成果数量少,层次低;学校外语图书资料、现代化教学设施不配套。作者呼吁教育主管部门和学校领导要高度重视大学英语师资队伍建设。  相似文献   

单片机等效采样示波器的设计   总被引：2，自引：0，他引：2  

韩峰 《鸡西大学学报》2006,6(6):63-64

介绍了基于单片机系统的精密时钟发生电路对高频信号（1MHz～80MHz）进行等效采样的方法，设计并实现一个模拟带宽为1Hz～80MHz的简易数字示波器。  相似文献   

Latent Markov Factor Analysis for Exploring Measurement Model Changes in Time-Intensive Longitudinal Studies     

Leonie V. D. E. Vogelsmeier  Jeroen K. Vermunt  Eeske van Roekel  Kim De Roover 《Structural equation modeling》2019,26(4):557-575

When time-intensive longitudinal data are used to study daily-life dynamics of psychological constructs (e.g., well-being) within persons over time (e.g., by means of experience sampling methodology), the measurement model (MM)—indicating which constructs are measured by which items—can be affected by time- or situation-specific artifacts (e.g., response styles and altered item interpretation). If not captured, these changes might lead to invalid inferences about the constructs. Existing methodology can only test for a priori hypotheses on MM changes, which are often absent or incomplete. Therefore, we present the exploratory method “latent Markov factor analysis” (LMFA), wherein a latent Markov chain captures MM changes by clustering observations per subject into a few states. Specifically, each state gathers validly comparable observations, and state-specific factor analyses reveal what the MMs look like. LMFA performs well in recovering parameters under a wide range of simulated conditions, and its empirical value is illustrated with an example.  相似文献   

农田鼠类抽样技术研究初报   总被引：3，自引：0，他引：3  

黄秀清  冯志勇  颜世祥  帅应垣 《中山大学学报论丛》1995,(1)

本文研究了不同布夹数及不同布夹次数所捕获鼠类的数量组成、鼠类生物量及捕获丰的差异；探讨了样区间黄毛鼠的繁殖特征．提出在某一地区进行鼠情系统调查和监测时，应选若干个样区，每个样区每月布夹调查一次．每次布放150夹夜便可．  相似文献