Analyzing type II censored data obtained from repetitious experiments

Experimental design and Taguchi's parameter design are widely employed by industry to optimize the process/product. However, censored data are often observed in product lifetime testing during the experiments. After implementing a repetitious experiment with type II censored data, the censored data are usually estimated by establishing a complex statistical model. However, using the incomplete data to fit a model may not accurately estimates the censored data. Moreover, the model fitting process is complicated for a practitioner who has only limited statistical training. This study proposes a less complex approach to analyze censored data, using the least square estimation method and Torres's analysis of unreplicated factorials with possible abnormalities. This study also presents an effective method to analyze the censored data from Taguchi's parameter design using least square estimation method. Finally, examples are given to illustrate the effectiveness of the proposed methods.     

抗差性的讨论

在观测数据不服从正态分布的情况下 ,一个好的估计量 ,不仅要是有效的 ,还必须具有抗差能力 .作者利用影响函数 ,讨论了样本均值和中位数的抗差能力 .     

Secluded and Proximate Illiteracy: Comparing Situations

Triplot is used to portray the three-dimensional concepts – literate, proximate illiterate and secluded illiterate. Pictographic portrayal complemented with a method proposed to calculate distance between situations enhances comparison. Illustration with Indian data explains change over time, rural-urban divide, and social gap.     

定向越野应用于农村中学生中长跑训练的实验研究

多年来,学生对中长跑兴趣低,一直是中长跑训练的难点,也是我国学生心肺功能和耐力素质较差的原因之一。该研究将一种新兴的体育运动项目———定向越野运动引入农村学校中长跑训练中,以期提高学生对中长跑的兴趣,培养自觉锻炼的习惯,使学生的心肺功能和耐力素质得以提高。     

凸透镜焦距测量的误差分析和减小方法

分析凸透镜光心位置偏差和清晰成像位置不确定对凸透镜焦距测量的影响 ,讨论减小凸透镜焦距测量误差的方法     

Some finite sample properties of generalized ridge regression estimators

In this paper we study the mean square error properties of the generalized ridge estimator. We obtain the exact and the approximate bias and the mean square error of the operational generalized ridge estimator in terms of G( ) functions. We show, among other things, that the operational generalized ridge estimator does not dominate the ordinary least squares estimator up to a certain order of approximation. Finally, we note that the iterative procedures to obtain coverging ridge estimators should be used with caution.     

On the asymptotic distribution of a class of aligned rank order test statistics in randomized block designs

In the present investigation, the unconditional asymptotic distribution of a class of aligned rank order test statistics for randomized block designs is derived under the null hypothesis and for nearby alternatives, as the number of blocks tends to infinity. The proofs of these results are based on the asymptotic equivalence in quadratic mean between aligned observations and their ranks and thus are quite similar to the Hájek and SKidák (1967) approach.     

Testing lack of fit in regression without replication

An F-statistic which tests a hypothesized linear regression model against the general alternative is developed. Observations are grouped using “near neighbours” and a generalization of the usual lack of fit test is derived. Two data sets from Daniel and Wood (1971) are used to illustrate the methodology. Power considerations are discussed.     

测量特征参数原则的应用

本文提出了测量特征参数原则可用于最小实体要求的检测,并结合最小实体要求诮于位置度的实例进行了检测方法设计。     

话语交际中的礼貌原则与交际距离

礼貌的语言能缩短交际距离、缓解紧张或消除冲突。礼貌原则的各项准则是对礼貌话语的语言机制的总结和阐述。只有遵守了礼貌原则 ,才能很好地保持和维护一定的交际距离 ,从而有效地完成交际行为