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Partialleastsqllares(PLS)regresslonIsdesignedtosolvethelinearregresslonproblemwhilemulticollinearityexists(see[1-51).H。everthePLSmethodIsIneffectl、Insomecases.PLSmethodsarebasedontheseqllentlalselectionofpotentialfactorsti,…,tkmaximizingthec。rlancesCoy(t;,Y);arrangedIndescendingorder,accordingtoacross一、lldatloncriterion.SinceCoy(t;,Y)一Corr(。;;Y)一,theenlargeme。ofCoy(t;,Y)maybesolelyduetoalarse一whileCorr(。;,Y)issmall,andinthissituationtheP… 相似文献
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We study an estimator of the survival function under the random censoring model. Bahadur-type representation of the estimator
is obtained and asymptotic expression for its mean squared errors is given, which leads to the consistency and asymptotic
normality of the estimator. A data-driven local bandwidth selection rule for the estimator is proposed. It is worth noting
that the estimator is consistent at left boundary points, which contrasts with the cases of density and hazard rate estimation.
A Monte Carlo comparison of different estimators is made and it appears that the proposed data-driven estimators have certain
advantages over the common Kaplan-Meier estmator. 相似文献
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程博 《数学的实践与认识》2010,40(3)
企业的竞争实质是企业家之间能力的较量,企业家能力已成为企业能否实现利益最大化和能否可持续发展的决定因素,企业家的能力对企业生存、发展有着极其重要的意义.本文首先借助系统工程的理论与方法,利用Delphi法构建评价矩阵识别企业家能力因子;其次,结合企业家能力因子的特征,构建企业家能力因子解释结构模型(ISM),探讨了企业家能力因子之间的内在关系,为培植企业家核心能力提供了相关建议. 相似文献
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为改进固体火箭发动机传统试验模式存在的资源瓶颈、试验性能难以预示等问题,在固体火箭发动机试验与测试领域引入虚拟试验技术,设计并开发了固体火箭发动机虚拟试验基础系统;阐述了固体火箭发动机试验模型、试车架模型的建模方法,利用均匀设计方法分析影响内弹道数据的主要因素权重,以修正虚拟试验内弹道数据;针对某型号固体火箭发动机进行虚拟验证,试验结果表明,虚拟试验基础系统在一定程度上具有与真实固体火箭发动机地面试验相似的流程和功能,通过修正虚拟试验内弹道数据,进一步降低了虚拟试验结果与真实试验结果间的误差,为深入开展固体火箭发动机虚拟试验技术研究奠定了基础。 相似文献
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Whenmulticollinearityexists,theordinaryleastsquares(OLS)methodbecomesinefficient.TOavoidthis,partialleastsquares(PLS)regressionisdeveloped(see[2],[4]or[6-8]).Butlikeotherregressionmethods,thePLSfittingcouldbesubstantiallyalteredbyoneorafewinfluentialpoints.Inthispaper,asecondorderlocalapproach(see[1],[9]or[10])isthemaintooltoidentifyinfluentialpointsinPLSregression.LetYbethenx1responsevector,andXtheknownnxpexplanatorymatrix.WhenfitthemodelY~Xo 55whereE~N(0,a'In),wewritetheperturbeddis… 相似文献
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