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文章讨论了矩阵方程AX=B解的存在状况和解的结构问题,得出:当秩(A,B)>秩(A)时AX=B无解;当秩(A,B)=秩(A)=n时AX=B有唯一解;当秩(A,B)=秩(A)相似文献
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针对群体层次分析法的权重计算问题,采用对数回归法求解。分析线性方程组,得到其系数矩阵的秩小于矩阵行数。通过修改系数矩阵的最后一行,使其为满秩,从而保证了解的唯一性。同时给出了稳定快速的基于LU分解的算法实现步骤。 相似文献
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判别分析是-种广泛使用的样本归类法,然而对于在时间、空间或其他方面的有序数据进行处理时,传统判别方法有一定的局限性.本文旨在探索-种简洁的有序判别分析方法,并通过对我国外向型经济发展状况进行分析进行实践. 相似文献
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针对归零Turbo码码率、码组起点、交织起点、交织长度参数识别问题,首先引入矩阵秩量比的概念,推导出适用于归零Turbo码矩阵秩量比下限,提出了基于秩量比判决门限的码长识别算法;其次,遍历一交织帧输出码元,找出最小秩量比对应的位置,实现交织起点和码组起点的识别;然后,依靠完整的交织帧输出数据,利用分析矩阵实现码率与分量编码器中寄存器个数识别;最后,由以上识别的参数计算出交织长度。仿真结果表明:在信噪比为5 dB时,单靠信息序列,各部分的识别概率能达到80%以上;在交织长度为100时,提出的识别算法与传统算法相比,性能相近,识别时间大约缩短为原来的1/3。 相似文献
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While primary data analysis has been popular in logistics and supply chain research, secondary data methods have been overlooked. These methods, however, have the potential to generate a variety of important opportunities to expand the horizons of logistics and supply chain research. In this article, we emphasize the use of secondary data analysis and how it can address contemporary challenges in logistics and supply chain research. Our review of the logistics and supply chain literature identifies six important methodologies that can be useful for secondary data generation and analysis. We discuss how these methods can help effectively address various logistics research questions. 相似文献
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近年来,供应链管理实践中产生的数据量呈指数增长,大数据分析在供应链中存在巨大的发展空间,然而,当前对于供应链中大数据分析应用还缺乏深入研究。通过相关文献梳理,对国外供应链中大数据应用进行深入探析,结合国内外研究成果回顾了不同行业供应链中的大数据应用及其商业价值,鉴于已有研究,对未来该领域研究进行大胆展望。文章将丰富国内供应链中的大数据分析应用理论,为学术界和实务界在供应链管理各个方面实施大数据分析应用提供指导。 相似文献
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老年人健康状况研究中常常会遇到各种等级变量的分组比较,如健康状况自我评价年龄间、性别间、城乡间的比较、当采用原始数据进行分组比较时,通常只能说明等级构成上的不同,却很难判别各组的好差或高低。Ridit分析是一种用来处理等级变量的统计分析方法,平均Ridit值作为一个指标用于处理等级资料具有简单明了、易于理解、便于比较的特点。 相似文献
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Despite the growth in the size and complexity of corporate data, the technology for analyzing it has not kept up with the advances in data collection, in that managers mostly need to rely on marketing research and information systems experts to generate the analysis and reports they need. We review some useful approaches here from the computer science and information systems fields for the analysis of large data sets, viz. good data organization and the use of flexible analysis tools, for making the analysis more tractable and user-friendly. These methods are increasingly being adopted by practitioners who are hard-pressed to generate business intelligence from large corporate databases. However, the benefits of these approaches may not be confined only to practitioners, and may apply to academic researchers working with large data sets, as well. 相似文献
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数据挖掘是一门新兴技术,随着社会经济的发展,数据挖掘与处理愈发显得重要了。在社会经济现象分析中发现统计来的数据有异常现象。而这些异常数据对社会经济现象起了很大的作用。正确挖掘数据、处理数据,有利于正确认识现象规律,对指导经济发展具有重要意义。 相似文献
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论数据分组的误导作用 总被引:1,自引:0,他引:1
对数据分组之后再进行处理是一种常见方法,但是这种方法可能产生错误结果.本文搜集了几个实际的数据分析案例,说明对数据的分析可以是任意的,但是对分析结果的解释必须受制于研究对象和周围条件.本文结合案例提出了一些避免分组陷阱的手段,还提供了理解辛普森悖论的一个角度. 相似文献
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DeCarlo Thomas E. Laczniak Russell N. Azevedo Kari A. Ramaswami Sridhar N. 《Marketing Letters》2000,11(4):349-361
Log-linear procedures have been recommended for analyzing data that are in the form of counts or frequencies (Iacobucci and McGill 1990). In its current form, the recommended procedure does not deal with multiple response data (i.e., more than one thought per response category). The paper proposes analytical modifications that researchers need to consider when fitting models with this type of data. The problems and recommended modifications are illustrated with two distinct data sets. The first involves consumers' attribution responses to negative word-of-mouth communication about a brand whereas the second pertains to consumers' cognitive responses toward an advertisement. Results in each case indicate that researchers may generate erroneous conclusions about the significance of estimated parameters if the recommendations are ignored. 相似文献
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Way C.W. Chang Po-Young Chu Cherng G. Ding Soushan Wu 《Group Decision and Negotiation》2000,9(1):47-61
With n individuals ranking m objects, the exhaustive comparison approach, proposed in this paper, produces a list of order vectors sorted by the relative number of concordant pairs. The exhaustive comparison approach compares all possible order vectors instead of "an" optimal order vector to help the data analyst to consider "practical" solutions rather than a "desired" solution. An overall concordant order ratio is proposed to measure "how well" each order vector may represent the ranking structure of an ordinal data set. And the marginal concordant ratio evaluating the goodness of fit of each object in each order vector is also proposed in this paper. Comparisons among some popular ranking methods are discussed in this article. An empirical survey data regarding how travellers considered various factors for choosing travelling locations are used to illustrate the proposed method and calculations. 相似文献