由VFC构成ADC的高精度电量测试系统

介绍了一种由V／F变换实现模数转换（A／D）的测试系统，其中利用了多功能同步V／F转换器AD652，测试直流电压的精度高达十万分之三左右。     

Allocating observations between two normal populations to maximize the half slope of the F-test

Consider two independent normal populations. Let R denote the ratio of the variances. The usual procedure for testing H₀: R = 1 vs. H₁: R = r, where r≠1, is the F-test. Let θ denote the proportion of observations to be allocated to the first population. Here we find the value of θ that maximizes the rate at which the observed significance level of the F-test converges to zero under H₁, as measured by the half slope.     

Better approximate confidence intervals for a binomial parameter

This paper discusses five methods for constructing approximate confidence intervals for the binomial parameter Θ, based on Y successes in n Bernoulli trials. In a recent paper, Chen (1990) discusses various approximate methods and suggests a new method based on a Bayes argument, which we call method I here. Methods II and III are based on the normal approximation without and with continuity correction. Method IV uses the Poisson approximation of the binomial distribution and then exploits the fact that the exact confidence limits for the parameter of the Poisson distribution can be found through the x² distribution. The confidence limits of method IV are then provided by the Wilson-Hilferty approximation of the x². Similarly, the exact confidence limits for the binomial parameter can be expressed through the F distribution. Method V approximates these limits through a suitable version of the Wilson-Hilferty approximation. We undertake a comparison of the five methods in respect to coverage probability and expected length. The results indicate that method V has an advantage over Chen's Bayes method as well as over the other three methods.     

中国与东欧经济改革比较研究

原中央计划经济国家近年的经济改革导致不同的结果：东欧国家的经济衰退和中国的经济高速增长．本文利用描述性统计方法表示正在进行经济改革的某些国家的各种经济性能指标，并调查与考察了中央计划经济国家改革的理论、时机、速度、规模及先后次序．     

A note on the admissibility of hammersley's estimator of an integer mean

Let X₁, X₂, …, X_n be identically, independently distributed N(i,1) random variables, where i = 0, ±1, ±2, … Hammersley (1950) showed that d = [X?_n], the nearest integer to the sample mean, is the maximum likelihood estimator of i. Khan (1973) showed that d is minimax and admissible with respect to zero-one loss. This note now proves a conjecture of Stein to the effect that in the class of integer-valued estimators d is minimax and admissible under squared-error loss.     

Nonparametric repeated significance tests for one-way anova with adoptation to multiple comparisons

Based on two-sample rank order statistics, a repeated significance testing procedure for a multi-sample location problem is considered. The asymptotic distribution theory of the proposed tests is given under the null hypothesis as well as under local alternatives. A Bahadur efficiency result of the repeated significance test relative to the terminal test based solely on the target sample size is presented. In the adaptation of the proposed tests to multiple comparisons, an asymptotically equivalent test statistic in terms of the rank estimators of the location parameters is derived from which the Scheffé method of multiple comparisons can be obtained in a convinient way.     

On the use of the t-statistic in preliminary testing procedures for the Behrens-Fisher problem

Preliminary testing procedures for the two means problem traditionally employ the pooled variance t-statistic. In this paper we show that bias of the t-statistic under conditions of heterogeneity of variance may be increased if use of the t-statistic is conditional on an affirmative F-test. For this reason we conclude that use of the t-statistic in preliminary testing procedures is inappropriate.     

Antipodally symmetric distributions for orientation statistics

The conventional antipodally symmetric Bingham matrix distribution on the Stiefel manifold is generalized. Large sample maximum likelihood estimation and uniformity tests are discussed, and a parametric model for axial orientations (X-shapes) is suggested. A generalization of the Khatri-Mardia matrix distribution is developed to provide a model suitable for hybrids (T-shapes).     

语言·心智·对立二重性

语言是表现着差异及对立的纯粹的价值系统,这是索绪尔对语言本质的最精辟论断。它蕴含着深刻的辩证法思想。深刻解读语言的对立二重性是理解索绪尔全部语言学理论的根本。心智的结构与语言的结构有着惊人的相似性,这种相似性即体现在对立二重性上。通过解构心智去认识心智与语言的关系避免了语言与心智的循环论证,对语言学研究及认识心智具有方法论和认识论的重要意义。本文解析了语言及心智的对立二重性,并揭示了其间的内在联系。     

The hub continent. Immigrant networks, emigrant diasporas and FDI

This paper studies the relations between bilateral FDIs and immigrant networks of France, Germany, UK, Italy and Spain, and the emigrant diasporas of Italy and Spain. It focuses on skilled and unskilled immigrants and on ties with developing and developed countries. Results evidence two different network models: FDIs of UK, Germany and France are prompted by the ties of skilled immigrants, while those of Italy and Spain are only influenced by their respective diasporas. The disparity may stem from history. Differently from the findings of previous literature, the effects of networks with developing countries are similar to those with rich economies.