排序方式： 共有13条查询结果，搜索用时 15 毫秒
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开放大学的终结性考试成绩数据中异常值存在的概率较大,为考试成绩的统计分析带来一定困难。稳健统计方法对考试成绩数据异常值的处理较为科学。实验研究表明,当考试成绩中存在极高分、极低分、缺考等情况时,稳健统计的统计结果受其影响较小,从而能够更准确、客观地反映学生学习的整体水平。 相似文献
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曹薇 《武汉职业技术学院学报》2005,4(1):56-59
阐述了数据清理的概念和意义，介绍了缺失值修补和孤立点识别采用的主要方法，并指出有待进一步研究的问题。 相似文献
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肖洛霍夫《静静的顿河》里的主人公葛利高里形象的复杂性在评论界历来备受关注和争议。从文本解读来看，除了外部因素的多重影响，其政治立场的多变性摇摆性更出于自身的精神探索和真理追寻。这种不断地思考怀疑、游离漂泊的精神特质，与俄国文学史上的“多余人”形象有着一定的内在相似性。这是俄国文化意义上的知识分子的一种存在方式和精神标志，是作家在特定时代中对包孕着民族性格和文化精神的“人的魅力”的隐性表现。 相似文献
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Victor H. Kelley 《Journal of Experimental Education》2013,81(3):249-250
Marsh and Hau (1996) based the assertion that parsimony is not always desirable when assessing model fit on a particular counterexample drawn from Marsh's previous research. This counterexample is neither general nor valid enough to support such a thesis. More specifically, the counterexample signals an oversight of extant, stochastic models justifying correlated uniquenesses, namely, moving-average and autoregressive moving-average models. Such models provide theoretically plausible motives for a priori specification of error correlations. In fact, when uniquenesses are correlated, stochastic models other than the conventional simplex and quasi-simplex models must be tested before positive identification of the process is possible (Sivo, 1997). In short, exchanging the mechanistic penalties for model complexity for the mechanistic specification of untenable measurement-error covariances offers no solution. Parsimony has not been dismissed based on the argument Marsh and Hau presented concerning longitudinal data. 相似文献
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This article illustrates a method for fitting straight lines to data that is resistant to outliers and might therefore sometimes be preferred to the customary least squares procedure. 相似文献
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《师资教育杂志》2012,38(3):343-357
Situating the quest for ‘best practice’ in education in the early ambitions of the Royal Society of London and the early history of statistics, and in insights offered by John Dewey in his 1929 Gifford and Kappa Delta Pi lectures, the paper argues for greater appreciation of the uncertainties and complexities of teaching and learning and for greater modesty in researcher claims. It contends that the quest for best practices in education needs to be tempered with the notion of better over best practice by maintaining the value of, and the need for, a greater place for outliers in research. 相似文献
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Mahalanobis distance (M-distance) case diagnostics are a useful tool for assessing response pattern inconsistency in factor analysis; however, the derivations of these statistics assume continuous variables, which limits their utility in ordinal self- or rater-report data. This research generalizes M-distance diagnostics to categorical factor analysis. We prove that the residual-based M-distance dr is equivalent to the person-fit index lco, which motivates the use of the new categorical M-distance dr* as a person-fit index. dr* is compared and contrasted with zh, a commonly used item response theory person-fit index. A simulation study is used to show that a simple transformation of dr* satisfies established criteria for person-fit measures. A sample of responses to the Rosenberg Self-Esteem Scale is used to determine parameters for a simulation study, and real data are analyzed to contrast the use of dr and dr* as indexes of person-fit in continuous and categorical factor analysis. 相似文献
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