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171.
In this paper we study the sensitivity of the optimum balanced resolution V plans for 2m factorials, to outliers, using the measure suggested by Box and Drapper (1975). We observe that the designs are robust, i.e., have low sensitivity. 相似文献
172.
Samuel D. Oman 《Journal of statistical planning and inference》1983,7(4):359-369
Consider the problem of estimating the mean of a p (≥3)-variate multi-normal distribution with identity variance-covariance matrix and with unweighted sum of squared error loss. A class of minimax, noncomparable (i.e. no estimate in the class dominates any other estimate in the class) estimates is proposed; the class contains rules dominating the simple James-Stein estimates. The estimates are essentially smoothed versions of the scaled, truncated James-Stein estimates studied by Efron and Morris. Explicit and analytically tractable expressions for their risks are obtained and are used to give guidelines for selecting estimates within the class. 相似文献
173.
In this paper we study a robustness property of partially balanced incomplete block designs based on association schemes with m classes (PBIBD(m)) against the unavailability of data in the sense that, when any t (a positive integer) observations are unavailable the design remains connected w.r.t. treatment. We characterize the robustness property of PBIBD(m) completely for m=2 and partially for m=3. 相似文献
174.
随着《中小学教师继续教育工程方案》任务的完成,国家和各级地方政府教育部门正着手部署新一轮的中小学教师的继续教育。本文提出确立新一轮教师继续教育目标的原则与新一轮中小学教师继续教育的国家目标、地区目标、学校目标与个人发展目标主要内容及相互关系。 相似文献
175.
Masahide Kuwada 《Journal of statistical planning and inference》1982,7(1):39-48
This paper presents the trace of the covariance matrix of the estimates of effects based on a fractional 2m factorial (2m-FF) design T of resolution V for the following two cases: One is the case where T is constructed by adding some restricted assemblies to an orthogonal array. The other is one where T is constructed by removing some restricted assemblies from an orthogonal array of index unity. In the class of 2m-FF designs of resolution V considered here, optimal designs with respect to the trace criterion, i.e. A-optimal, are presented for m = 4, 5, and 6 and for a range of practical values of N (the total number of assemblies). Some of them are better than the corresponding A-optimal designs in the class of balanced fractional 2m factorial designs of resolution V obtained by Srivastava and Chopra (1971b) in such a sense that the trace of the covariance matrix of the estimates is small. 相似文献
176.
An account of the behavior of the independent-samples t-test when applied to homoschedastic bivariate normal data is presented, and a comparison is made with the paired-samples t-test. Since the significance level is not violated when applying the independent-samples t-test to data which consist of positively correlated pairs and since the estimate of the variance is based on a larger number of ‘degrees of freedom’, the results suggest that when the sample size is small, one should not worry much about the possible existence of weak positive correlation. One may do better, powerwise, to ignore such correlation and use the independent-samples t-test, as though the samples were independent. 相似文献
177.
K.A. Bush 《Journal of statistical planning and inference》1981,5(4):391-398
Recently Bush and Ostrom (1979) settled most of the open questions with respect to inequivalent solutions of a class of semiregular (SR) designs which can be constructed from nets. This paper is a study of the same nature for two families of regular (R) designs derived from finite projective planes. One family presents no problems, but the other which is a ‘double’ family with two parameters is much more difficult. In fact it is here solved only for designs based on planes of orders 3, 4, 5 and 8. Certain general methods exist which are indicated, but we were unable to resolve even the case 7 using this technique.Basically we show the existence of either inequivalent solutions or show there is but one solution settling a number of open cases. In particular for the case λ1 = 2, λ2 = 1 we give new solutions to a number of D(2) designs or group divisible designs with two associate classes which have no repeated blocks in contrast with the published solutions which have this undesirable property for a number of applications. 相似文献
178.
Jennifer Seberry 《Journal of statistical planning and inference》1984,10(1):69-82
Some recursive constructions are given for Bhaskar Rao designs. Using examples of these designs found by Shyam J. Singh, Rakesh Vyas and new ones given here we show the necessary conditions λ≡0 (mod 2), λυ(υ?1)≡0 (mod 24) are sufficient for the existence of Bhaskar Rao designs with one association class and block size 3. This result is used with a result of Street and Rodger to obtain regular partially balanced block designs with 2υ treatments, block size 3, λ1=0, group size 2 and υ groups. 相似文献
179.
Theorems 5, 6 and 10, and Tables 1–2 in Ghosh (1981) are corrected. These are concerned with search designs which permit the estimation of the general mean and main effects, and allow the search and estimation of one possibly unknown nonzero effect among the two- and three-factor interactions in 2m factorial experiments. Some new results are presented. 相似文献
180.
This article examines whether the influence of family background on educational attainment has changed in Italy in the course of the 20th century. For several European countries, recent studies have come to question the widely agreed thesis of persistent schooling inequalities. This work discusses extensively factors that may produce variations of class differentials in academic achievement and in participation rates in the Italian case. The empirical analyses are based on a new dataset and on new modelling techniques that ensure high statistical power to detect trends over time. Yet, the substantive conclusions point to a prevailing stability of class differentials, with a limited equalisation restricted to the agricultural classes in the oldest cohorts. 相似文献