2m fractional factorial designs of resolution V with high A-efficiency, 7 ⩽ m ⩽ 10

We present 111 2^m fractional factorial designs of resolution V for 7 ⩽ m ⩽ 10. These designs are the best known to the authors with respect to the A-optimality criterion (as of October 1995).     

改进的初值和背景值优化的MGM(1,m)模型及应用

针对传统的MGM(1,m)模型存在模拟精度和预测精度不高的问题,文章给出了改进的初值和背景值优化的MGM(1,m)模型。在模型初值的选取上,选取使得模拟值的平均相对误差达到最小的向量X(1)(i)作为初值;在模型背景值的构造上,提出结合辛普森3/8公式的动态序列模型来求解背景值的方法。最后以两组指数型数据序列为例建立了传统MGM(1,2)模型及改进后的模型,并进行数据模拟和预测。结果表明,改进后的MGM(1,m)模型的模拟精度和预测精度均有显著地提高,从而验证了模型的有效性和可行性。     

Estimation of p{y p> max(y1, y2, …, yp-1)}in theexponential case

This paper deals with the derivation of (i) the MLE (ii) the MVUE (iii) a Bayes estimator of the probability in the title, for the case p = 2. Simulation studies are carried out to compare these estimators. The results suggest that the MLE and the Bayes estimator are biased and the Bayes estimator have the smallest MSE. In the general case, explicit expression for the probability in the title is derived and the MLE and Bayes estimator are obtained. A general method of deriving the MVUE is pointed out. Because of the simulation studies for p = 2 it is recommended that the Bayes or predictive estimator should be used.     

Reverse Foldovers for Blocked 2 m−k Fractional Factorial Designs

Two-level regular fractional factorial designs are often used in industry as screening designs to help identify early on in an experimental process those experimental or system variables which have significant effects on the process being studied. When the experimental material to be used in the experiment is heterogenous or the experiment must be performed over several well-defined time periods, blocking is often used as a means to improve experimental efficiency by removing the possible effects of heterogenous experimental material or possible time period effects. In a recent article, Li and Jacroux (2007 Li , F. , Jacroux , M. (2007). Optimal foldover plans for blocked 2 ^m?k fractional factorial designs. J. Statsist. Plann. Infer 137:2434–2452. [Google Scholar]) suggested a strategy for constructing optimal follow-up designs for blocked fractional factorial designs using the well-known foldover technique in conjunction with several optimality criteria. In this article, we consider the reverse foldover problem for blocked fractional factorial designs. In particular, given a 2^(m+p)?(p+k) blocked fractional factorial design D, we derive simple sufficient conditions which can be used to determine if there exists a 2^{(m+p?1)?(p?1+k+1)} initial fractional factorial design d which yields D as a foldover combined design as well how to generate all such d. Such information is useful in developing an overall experimental strategy in situations where an experimenter wants an overall blocked fractional factorial design with “desirable” properties but also wants the option of analyzing the observed data at the halfway mark to determine if the significant experimental variables are obvious (and the experiment can be terminated) or if a different path of experimentation should be taken from that initially planned.     

Conditional logistic regression in cluster-specific 1: m matched treatment–control designs

Conditional logistic regression is a popular method for estimating a treatment effect while eliminating cluster-specific nuisance parameters when they are not of interest. Under a cluster-specific 1: m matched treatment–control study design, we present a new closed-form relationship between the conditional logistic regression estimator and the ordinary logistic regression estimator. In addition, we prove an equivalence between the ordinary logistic regression and the conditional logistic regression estimators, when the clusters are replicated infinitely often, which indicates that potential bias concerns when applying conditional logistic regression to complex survey samples.     

2n−m designs with resolution III or IV containing clear two-factor interactions

For a fixed number of runs, not all 2^n−m designs with resolution III or IV have clear two-factor interactions. Therefore, it is highly desirable to know when resolution III or IV designs can have clear two-factor interactions. In this paper, we provide a unified geometrical study of this problem and give a complete classification of the existence of clear two-factor interactions in regular 2^n−m designs with resolution III or IV and reveal the structures of these designs.     

1．4亩水萝卜收入1．2万多元

１．４亩水萝卜收入１．２万多元沭阳县统计局范志峰沐阳县酉圩乡邱庄村农民李士雨，一家８口人，种着１２亩承包地，收种锄割，忙里忙外，力气花了不少，一年粮食产量也超过万斤，但除去口粮、饲料粮，剩下的卖点钱，买化肥、种子，交提留，加上人情来往．一年忙到头，虽...     

Minimum Variance and VOQL Chain Sampling Plans–ChSP-4(c 1, c 2)

In this article the outgoing quality and the total inspection for the chain sampling plan ChSP-4(c ₁, c ₂) are introduced as well-defined random variables. The probability distributions of outgoing quality and total inspection are stated based on total rectification of non conforming units. The variances of these random variables are studied. The aim of this article is to develop procedures for minimum variance ChSP-4(c ₁, c ₂) sampling plans and their determination. In addition to minimum variance sampling plans, a procedure is developed for designing plans with a designated maximum variance, a VOQL (Variance of Outgoing Quality Limit) plan. The VOQL concept is analogous to the AOQL (Average Outgoing Quality Limit) except in the VOQL plan, it is the maximum variance which is established instead of the usual maximum AOQ.     

2m − p compromise plans with strongly clear specified main effects and two-factor interactions

This article studies two-level strongly clear compromise plans. We derive some necessary conditions for the existence of four classes of two-level strongly clear compromise plans which allow the estimations of some specified main effects and two-factor interactions, with the assumption that the fourth- or higher-order effects are negligible. Also, some methods for constructing 2^{m ? p} strongly clear compromise plans are introduced.     

今年将新建廉租房136万m2 甘肃省政府与住建部签订保障住房目标责任书

内蒙古财政厅发布消息：截至2010年5月15日，全区“一卡通”发放补贴资金61．92亿元，比2009年全年发放数多14．07亿元，涉及34类90项补贴资金，累计惠及1029万户城乡居民。在补贴资金发放数额方面，对种粮农民农资综合补贴、农村拆迁征地补助、退耕还林补贴排在前三位，分别为28．73亿元、10．33亿元、8．93亿元。从盟市发放资金数额看，鄂尔多斯市、通辽市、     

Orthogonal [k − 1, k + 1]-factorizations in graphs

Let G be a graph. Let F={F₁,F₂,...F_d} be a factorization of G and H be a subgraph of G. If H has exactly one edge in common with F_i for all i = 1,2,…,d, then we say that F is orthogonal to H. In this paper it is proved that for any d-matching M of a [kd − 1, kd + 1]-graphG, there is a [k − 1, k + 1]-factorization of G orthogonal to M where k ⩾ 2 is an integer.     

The Vanishing 2×2 Table: Linking the Hypergeometric,Binomial and Poisson

A simple procedure for establishing minimum sample size in X ² goodness-of-fit tests is presented. Samples of this size will automatically satisfy Yarnold's criterion.     

整合传统营销与数据库营销：“1＋1〉2”

在企业的营销实践中，根据自身实力情况和行业特点，不同的企业采取的营销手段不尽相同。厂告、公关和促销活动是企业在进行产品推厂和品牌推广时常用的传统营销手段，但都无法保证将信息传达至所有目标用户，甚至重点潜在市场的用户也不能确保有效覆盖。广告业界那句著名的天问：“我知道我的广告费有一半是浪费的。但我不知道浪费的是哪一半”。     

《统计》1979年1—2期1980年1一6期总目录

中华人民共和国国家统计局关于一九七八年国民经济计划执行结果的公报(79·1·1)国务院关于加强统计工作充实统计机构的决定 (79·2·1)国家计委国家经委国家农委国家建委国家统计局关于认真核实统计数字切实做好一九七九年统计年报工作的通知 (79·2·4)@5     

微型机数据处理组合软件包Lotus 1-2-3 简介

Lotus 1-2-3组合软件包是美国Lotus发展公司1983年推出的软件产品.它把数据表、数据库、图形处理以及其他多种辅助功能合为一体,为广大非计算机专业人员提供了在微型计算机上进行各种数据处理的有力工具,因而很快成为国外微机市场上最受欢迎的应用软件之一;近年来我国也开始推广应用,虽然时间不长,普及面还不广,但已在许多方面发挥了作用.     

Resampling estimation when observations are m–dependent

For m–dependent, identically distributed random observation, the bootstrap method provides inconsistent estimators of the distribution and variance of the sample mean. This paper proposes an alternative resampling procedure. For estimating the distribution and variance of a function of the sample mean, the proposed resampling estimators are shown to be strongly consistent.     

A Note on Overdifferencing and the Equivalence of Seasonal Time Series Models With Monthly Means and Models With (0, 1, 1)12 Seasonal Parts When ⊖ = 1

Two general models for monthly seasonal time series are considered, one in which seasonality is modeled with monthly means and another in which seasonality is modeled with a (0, 1, 1)₁₂ ARIMA structure. The models are shown to be equivalent if the seasonal moving average parameter (?) is 1 and if the same assumptions about the 12 initial observations are made for both models. The role of the assumptions about the initial observations is analyzed, and it is argued that for practical purposes the two models can be regarded as equivalent when ? = 1. It is observed that the result extends easily to more general models involving overdifferencing.     

Construction and selection of tightened–normal–tightened variables sampling scheme of type TNTVSS (n 1, n 2; k)

This paper provides tables for the construction and selection of tightened–normal–tightened variables sampling scheme of type TNTVSS (n ₁, n ₂; k). The method of designing the scheme indexed by (AQL, α) and (LQL, β) is indicated. The TNTVSS (n _T , n _N; k) is compared with conventional single sampling plans for variables and with TNT (n ₁, n ₂; c) scheme for attributes, and it is shown that the TNTVSS is more efficient.     

M1和M2作为货币政策中介目标的适用性研究

 M1、M2均符合可测性要求。稳定性检验和格兰杰因果检验结果表明，M1比M2更具可控性。Johansen协整检验、格兰杰因果检验、脉冲响应分析结果和基于M1、M2相对增长速度的分析结果表明，M1与货币政策最终目标的相关性好于M2。因此，我国仍应将M1作为货币政策中介目标，将M2作为观测目标，并要加强对M1的相对增长速度的调控。