排序方式： 共有74条查询结果，搜索用时 18 毫秒
31.
目的:立足在娱乐价值导向背景下,定义体育赛事的服务质量,对其提供一个模型,并在审美性、技术性和功能性质量三个方面塑造具体概念,检验这一服务质量模型的适应性及几个概念之间的关系。方法:采用数据收集和模型量表对比的方法来验证假设并作出最终结论,数据收集来自中国乒乓球职业联赛和CBA联赛的体育观众。结论:研究表明,体育赛事中的服务质量概念可以定义为审美性、技术性和功能性三个维度,以及比赛氛围、大众经验、对手特征、队员表现、一线雇员、设施使用和座位空间七个二级维度。职业赛事依据此结论能更好的管理自己的服务品牌,提高自身服务质量,营造良好的赛场气氛,推进整体职业赛事水平。 相似文献
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This study investigated the effect of complex structure on dimensionality assessment in compensatory multidimensional item response models using DETECT- and NOHARM-based methods. The performance was evaluated via the accuracy of identifying the correct number of dimensions and the ability to accurately recover item groupings using a simple matching similarity (SM) coefficient. The DETECT-based methods yielded higher proportion correct than the NOHARM-based methods in two- and three-dimensional conditions, especially when correlations were ≤.60, data exhibited ≤30% complexity, and sample size was 1,000. As the complexity increased and the sample size decreased, the performance of the methods typically diminished. The NOHARM-based methods were either equally successful or better in recovering item groupings than the DETECT-based methods and were mostly affected by complexity levels. The DETECT-based methods were affected largely by the test length, such that with the increase of the number of items, SM coefficients would decrease substantially. 相似文献
33.
利用传统方法很难在计算机上实现差分方程的解析解求解,本文提出了一种获得差分方程解析解的线性算法,该算法的基础是完全线形变化法。其核心操作为降维处理,对高阶差分方程进行逐次降阶运算,直至获得其解析解表达式。本质上,该算法属于Z变换法的一种矩阵法变形。算法的线性特征使得其容易移植到计算机上实现差分方程的解析解运算,而非传统的数值迭代解。 相似文献
34.
利用传统方法很难在计算机上实现差分方程的解析解求解,本文提出了一种获得差分方程解析解的线性算法,该算法的基础是完全线形变化法。其核心操作为降维处理,对高阶差分方程进行逐次降阶运算,直至获得其解析解表达式。本质上,该算法属于Z变换法的一种矩阵法变形。算法的线性特征使得其容易移植到计算机上实现差分方程的解析解运算,而非传统的数值迭代解。 相似文献
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对PCA算法进行了深入的研究,并将其应用到图像的特征降维中,有效降低了数据的复杂度,对图像自动标注、检索、识别等领域中的特征提取工作,具有一定的参考价值。 相似文献
36.
在大数据应用领域,如何快速地对海量数据进行挖掘是当前大数据应用基础研究的热点和难点,也是制约大数据真正应用的关键.而机器学习是解决该问题的有效途径,本文综述抽象增强学习、可分解增强学习、分层增强学习、关系增强学习和贝叶斯增强学习等五类增强学习方法的研究进展,分析了它们的优势和缺点,指出将监督学习或半监督学习与增强学习相结合是大数据机器学习的有效方法. 相似文献
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<正>Since the beginning of the 21st century,energy has become a new financial investment vehicle,indicating the arrival of a new era of energy finance.In the process of energy financialization,the electronic information carrier and network platform plays an important role.The arrival of the age of big data highlights the important position of information competition and network advantage. 相似文献
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Gudrun Erickson Lisbeth Åberg-Bengtsson Jan-Eric Gustafsson 《Educational Research and Evaluation》2013,19(3):188-208
The present study explored data from a survey of students’ performance in English at the end of compulsory school in 6 European countries. The aim was to gain deeper knowledge of the internal structure of the test and to discuss similarities and differences between the different settings regarding patterns in language proficiency. The analyses, conducted by a factor analytic approach and 2-level structural equation modelling (SEM) techniques, indicated an overall English achievement factor at both student and school levels. Furthermore, an effect of format differences at the student level, constituted by a factor related to tasks demanding constructed response, was found. Three correlated modality factors related to listening, linguistic, and reading skills were identified but not further elaborated on as they improved the model only modestly. Considerable differences in between-school variation were found in the different settings. The results are discussed in relation to the instrument, student achievements, and the state of English in the participating countries. 相似文献
39.
In structural equation modeling (SEM), researchers need to evaluate whether item response data, which are often multidimensional, can be modeled with a unidimensional measurement model without seriously biasing the parameter estimates. This issue is commonly addressed through testing the fit of a unidimensional model specification, a strategy previously determined to be problematic. As an alternative to the use of fit indexes, we considered the utility of a statistical tool that was expressly designed to assess the degree of departure from unidimensionality in a data set. Specifically, we evaluated the ability of the DETECT “essential unidimensionality” index to predict the bias in parameter estimates that results from misspecifying a unidimensional model when the data are multidimensional. We generated multidimensional data from bifactor structures that varied in general factor strength, number of group factors, and items per group factor; a unidimensional measurement model was then fit and parameter bias recorded. Although DETECT index values were generally predictive of parameter bias, in many cases, the degree of bias was small even though DETECT indicated significant multidimensionality. Thus we do not recommend the stand-alone use of DETECT benchmark values to either accept or reject a unidimensional measurement model. However, when DETECT was used in combination with additional indexes of general factor strength and group factor structure, parameter bias was highly predictable. Recommendations for judging the severity of potential model misspecifications in practice are provided. 相似文献
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回顾了产业生态网络实施效果的相关理论评述,并提出功能与结构、网络整体与网络成员关系构成其实施效果的四个维度,通过探测性因子分析验证并诠释了结构开放、结构柔性、环境和谐和价值增值组成产业生态网络的实施效果,它们分别隶属于产业生态网络实施效果的不同维度。 相似文献