首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 0 毫秒
1.
Abstract  The early history of correspondence analysis is reviewed. It is shown that K. P earson came very close to discovering correspondence analysis in 1906. That he did not actually discover it may be because he was not familiar with the singular value decomposition, which is the basic existence result in correspondence analysis.  相似文献   

2.
Psychometrics as a separate discipline is approximately 70 years old. Over the last 60 years, there has been an active participation of Dutch researchers in psychometrics. Ten years ago, Van der Heijden and Sijtsma [Statistica Neerlandica (1996) vol. 50, pp. 111–135] described the development of Dutch psychometrics and, as a follow up, we investigated the current state of psychometrics. This study is done through a series of interviews with 12 prominent psychometricians who participated in the International Meeting of the Psychometric Society in Tilburg from July 4 to 9, 2005. Their opinions on the past and present contributions of psychometrics, and their outlook on future developments were sought.  相似文献   

3.
Motivated by time-series experimental designs, we develop a model of the act of measurement in the social sciences. Meaningful measurements are represented by operators that obey a non-commutative algebra. Thus, the order in which information is extracted matters. In addition, responses to questions about an attribute depend on whether information about another attribute has previously been extracted. Measurement “forces” the subject to obtain one value of the attribute, the one measured by the observer. An uncertainty principle imposes a fundamental limit on the ability to extract detailed information about two distinct attributes within a short period of time.  相似文献   

4.
以中国知网统计的源期刊为依据,通过对速生桉研究人员在1990—2011年有关速生桉研究论文的发表数量、发表时间、研究内容、期刊分布、核心作者等进行统计分析,总结了我国速生桉的研究水平、科技成果及研究特点,为相关人员更深入地研究速生桉提供文献依据  相似文献   

5.
高度准确的测量结果在各行各业中都是非常重要的,没有准确的测量,产品质量就无从谈起。欲保证测量结果的高度准确,必须对测量系统进行分析,本文侧重用统计技术对测量系统进行分析,并提出了在哪些方面应该制定国家标准,用标准来规范测量系统。  相似文献   

6.
Deterministic frontier analysis (DFA), stochastic frontier analysis (SFA), and data envelopment analysis (DEA) are alternative analytical techniques designed to measure the efficiency of producers. All three techniques were originally developed within a cross-sectional context, in which the objective is to compare the efficiencies of producers. More recently all three techniques have been extended for use in a panel data context. In the latter context it is possible to measure productivity change, and to decompose measured productivity change into its sources, one of which is efficiency change. However when efficiency measurement techniques, particularly SFA, have been applied to panel data, it has infrequently been made clear what the objective of the analysis is: the measurement of efficiency, which may vary through time as well as across producers, or the measurement and decomposition of productivity change. In this paper I explore the use of each technique in a panel data context. I find DFA and DEA to have achieved a more satisfactory reorientation toward productivity measurement than SFA has.  相似文献   

7.
根据三点决定一个平面的原理,通过在盾构机中体上布置测量控制点,对其三维坐标进行测量;根据空间解析几何原理,推导出盾构机刀盘中心三维坐标以及俯仰角、横摆角、扭转角的计算方法。文章利用计算机的伪随机函数对盾构机姿态参数的测量精度进行了模拟评价,探讨了提高测量精度的方法。结果表明,盾构姿态参数的测量误差均服从正态分析;采用精度为3mm的激光经纬仪测量控制点坐标,得到的盾构姿态参数的误差范围比规范要求小得多。  相似文献   

8.
9.
违约概率度量是指对可能引起信用风险的因素进行定性分析、定量计算,以测量借款人的违约概率,为贷款决策提供依据。国际上违约概率度量领域的研究和实际应用,有从主观判断分析、财务比率分析、统计分析转向人工智能、以资本市场理论和信息科学为支撑的方法等动态计量分析方法为主的发展趋势。本文对商业银行的企业违约概率度量方法发展沿革进行了比较研究,并对违约概率度量方法的国内研究作了综合评述。  相似文献   

10.
平面度误差测量中常采用旋转法处理数据,使之符合最小条件,从而计算出平面度误差,但手工处理过程复杂,工作量大。使用自主开发的计算机辅助分析软件,不仅可以提高运算速度,而且可以通过CAD图形分析模块的分析,给生产加工提出指导性的意见。  相似文献   

11.
浅谈长沙市地下管线测量及其系统动态更新   总被引:1,自引:0,他引:1  
文章阐述了城市地下管线跟踪测量、竣工测量、管线详查及地下管线管理信息系统动态更新的工作流程及处理方法,为城市地下管线测量及数据库更新提供了一套先进方法。  相似文献   

12.
13.
Whilst statistics take up a prominent place in the social science research toolkit, some old problems that have been associated there with have not been fully resolved. These problems include bias through the inclusion of irrelevant variation and the exclusion of relevant variation, which may lead to hidden and spurious correlations in more extreme—however not at all unthinkable—cases. These issues have been addressed by Ragin by building a case for the usage of fuzzy set theory in social science. In this paper, we take a complementary view, insofar as we incorporate fuzzy set theory in current statistical analyses. Apart from shedding new light on the main issues associated with (population based) statistics, this approach also offers interesting prospects for the falsification of theories—rather than single relations between variables—in the social sciences.  相似文献   

14.
Measurement error regression models are factor analysis models, the latent ‘correct’ regressors are the factors. There is however no common statistical method between the factor analysis and the regression model, because the covariance elements that are known identifying constituents of the former model are unknown in the latter. Instead, the idea that the data come from the same regression model, as with panel data, but can be grouped in two or more groups, each group having its own different regrressor generating process, is shown to supply credible restrictions. We generalize and compare relevant identifiability criteria and corresponding asymptotically efficient estimators that are recursive in the number of overidentifying restrictions.  相似文献   

15.
为了提高流动电流仪(SCM)对自来水浊度检测的精度,文章提出了一种基于神经网络数据融合技术的数据处理方法。该方法可以消除测量中的原水流量、供电电源波动、絮凝剂浓度、温度等干扰量对流动电流仪的影响,提高了测量的精度。  相似文献   

16.
顺着社会发展,新技术、新设备不断进入我们的视线。测量技术也随之发展,采用GPS或全站仪测量,利用电脑支撑,用Excel代替计算器直接在电脑上计算,并转换为Access通用数据库,并赋值。其通用数据库可直接导入CAD或Mapgis成图。  相似文献   

17.
屠霞 《企业技术开发》2012,(31):66-67,74
计量管理作为企业全面管理的重要内容,也是企业实现质量管理的关键,对于保证企业产品质量,提高企业的经济效益具有非常重要的作用。文章概述了企业计量管理工作的特点,提出了企业计量管理对于企业发展的作用,并分析现阶段我国企业计量管理工作存在的问题,最后阐述了完善我国企业计量管理工作的有力措施,可以为相关计量工作人员开展计量管理工作提供参考。  相似文献   

18.
ABSTRACT

Understanding the developmental trajectories of big data analytics in the corporate context is highly relevant for information systems research and practice. This study presents a comprehensive bibliometric analysis of applications of big data analytics in enterprises. The sample for this study contained a total of 1727 articles from the Scopus database. The sample was analyzed with techniques such as bibliographic coupling, citation analysis, co-word analysis, and co-authorship analysis. Findings from the co-citation analysis identified four major thematic areas in the extant literature. The evolution of these thematic areas was documented with dynamic co-citation analysis.  相似文献   

19.
The competitive academic climate of all the academic fields, including business strategy, puts great stress to publish. To effectively maneuver the field of business strategy and the environment, all the stakeholders, such as academicians and practitioners, must understand the current position of the theory and practice. A systematic bibliometric analysis of a top tier journal can serve this issue by providing a holistic view of the publications' trends and trajectories. This study analyzes the trend of publication in the Business Strategy and the Environment (BSE) Journal since its inception in 1992 to 2019. The study uses two procedures to analyze the bibliometric data collected from the Scopus database. First, we use different aspects such as citation and publication structure to estimate the evolution of the BSE; second, we use VOS viewer software to visualize the mapping of BSE based on co‐citation, bibliographic coupling (BC), and co‐occurrence (CC). The results show a gradual increase in the citation and publication structure of the BSE. The increase in publications and citations indicates BSE's growing stature as a key academic outlet advancing knowledge in business strategy and environmental sustainability research. This study contributes to the literature by identifying the most influential aspects of the journal, which would help researchers to understand the trends and focus of the BSE.  相似文献   

20.
ABSTRACT

Performance measurement (PM) has become increasingly popular in the management of public sector organizations (PSOs). This is somewhat paradoxical considering that PM has been criticized for having dysfunctional consequences. Although there are reasons to believe that PM may have dysfunctional consequences, when they occur has not been clarified. The aim of this research is to conceptualize the dysfunctional consequences of PM in PSOs. Based on complementarity theory and contingency theory we conclude that dysfunctional consequences of PM are a matter of interactions between PM design and PM use, between control practices in the control system and between PM and context.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号