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831.
Burkhard O. Rauhut 《统计学通讯:理论与方法》2013,42(13):1439-1452
Given a life testing experiment consisting of n items, n-1 of which have the expected life λ while one could have an expected life λ/α with 0 < α < 1 the problem is. to find a mean square error (MSE) minimizing estimation function. The standard estimators for the homogeneous case (α = 1) overestimate the expected life and their MSE tend to infinity when a tends to 0. Looking at the estimation problem as an insurance (see Anscombe (1960)) two different “testimators” are compared with respect to their MSE, Numerical results show that an estimation function based on the “Epstein-statistic” x(n)/[xbar] is the best one. 相似文献
832.
A simple adaptation of a distribution-free method due to Scholz (1978) and Sievers (1978) for inference in a single regression setting is proposed for inference about the difference in slopes of two regression lines. We assume that the data are obtained from a designed experiment with common regression constants. A comparison of the proposed method to its competitors-one due to Hollander and the other due to Rao and Gore-indicates superiority of the new method. 相似文献
833.
Traditionally, the moments of the Weibull distribution have been calculated using the standard Weibull (Johnson and Kotz, 1970) . This article will expand on that idea and cover the truncated cases for the standard Weibull distributions. Also, the same techniques used for the standard form will be used to derive the moment expressions for the three-parameter complete and truncated Weibull distributions. The summary statistics are then calculated from the moment expressions. Weibull moments involve the gamma and incomplete gamma functions. 相似文献
834.
André Lucas 《统计学通讯:理论与方法》2013,42(10):2363-2380
This paper considers the robustness properties in the time series context of the least median of squares (LMS) estimator. The influence function of the LMS estimator is derived under additive outlier contamination. This influence function is redescending and bounded for fixed values of the AR parameters. The gross-error sensitivity, however, is an unbounded function of the AR parameters. In order to asses the global robustness behavior of the LMS estimator, we consider several notions of breakdown. The breakdown points of the LMS estimator depend on the value of the underlying AR parameter. Generally, the breakdown point is below one half for high values of the AR parameter. The bias curves of the LMS estimator reveal, however, that the magnitude of outliers has to be considerable in order to cause breakdown. 相似文献
835.
836.
诸多教育问题的产生源于两个主要问题:其一是学校教育的功能有限性;其二是教育主体之间的教育价值冲突。因而,我们需要重新定位学校教育的有限功能,并寻求教育主体之间能够达成共识的教育价值观。本文认为,建立在公共利益基础上的教育价值共识是解决教育问题的思想基础;以这种教育价值共识为基础,借助于信息技术支持的交流、交往、传播功能,建设多主体、多渠道、多层次的对话平台,以相互支持为准则的教育共同体是解决教育问题的实践路径。 相似文献
837.
《Journal of Statistical Computation and Simulation》2012,82(1):171-185
In this paper, inference for the scale parameter of lifetime distribution of a k-unit parallel system is provided. Lifetime distribution of each unit of the system is assumed to be a member of a scale family of distributions. Maximum likelihood estimator (MLE) and confidence intervals for the scale parameter based on progressively Type-II censored sample are obtained. A β-expectation tolerance interval for the lifetime of the system is obtained. As a member of the scale family, half-logistic distribution is considered and the performance of the MLE, confidence intervals and tolerance intervals are studied using simulation. 相似文献
838.
John E. Angus 《统计学通讯:理论与方法》2013,42(21):2477-2482
The asymptotic normality of the Cramer-von Mises one-sample test statistic and one of its variants under an alternative cdf is demonstrated. The derivation herein is unique in that it does not require knowledge of the theory of weak convergence of probability measures defined on metrized function spaces, and thus is accessible to a broader class of students and practitioners. 相似文献
839.
李本灿 《中南大学学报(社会科学版)》2013,(6):114-119
基于虐童现象的普遍性以及后果的严重性,虐童行为的规制成为必要,但方式应该是通过立法,而非司法。对于实践中以司法方式实现虐童入罪的做法,应当摒弃,并肃清其背后的理念、逻辑。虐童入罪固然必要,但是问题的解决更应该走向刑法之外,通过儿童保护及福利体系的建立,从根本上减少虐童现象的发生。 相似文献
840.
We consider a new class of scale estimators with 50% breakdown point. The estimators are defined as order statistics of certain subranges. They all have a finite-sample breakdown point of [n/2]/n, which is the best possible value. (Here, [...] denotes the integer part.) One estimator in this class has the same influence function as the median absolute deviation and the least median of squares (LMS) scale estimator (i.e., the length of the shortest half), but its finite-sample efficiency is higher. If we consider the standard deviation of a subsample instead of its range, we obtain a different class of 50% breakdown estimators. This class contains the least trimmed squares (LTS) scale estimator. Simulation shows that the LTS scale estimator is nearly unbiased, so it does not need a small-sample correction factor. Surprisingly, the efficiency of the LTS scale estimator is less than that of the LMS scale estimator. 相似文献