菌毒敌与石炭酸消毒效力的比较研究

采用石炭酸系数测定法、挖沟法及沉降法分别对菌毒敌和石炭酸的消毒效力进行了比较研究。结果表明:菌毒敌的石炭酸系数为3.34。菌毒敌(1:200)在室内空气消毒后1h和4h消除率分别为76.75％和85.81％;石炭酸(1:200)的消除率分别为50.73％和81.52％。试验表明:菌毒敌用于畜禽环境的消毒效力较石炭酸为佳。     

呈偏态分布的学业成绩——关于《高等代数》教学的一次终结性评价

应用现代教育评价和教育统计的有关理论与技术，对《高等代数》教学质量的终结性评价提供一次实际的操作程序和方法。     

展翅梁结构有机玻璃模型试验研究

简要介绍了展翅梁有机玻璃模型试验概况，验证了展翅梁结构剪力滞后、腹板弯矩分配比例的计算理论，检验了展翅梁结构的受力性能．     

Development of Specific hypothesis tests for estimated markov chains

We develop and evaluate the validity and power of two specific tests for the transition probabilities in a Markov chain estimated from aggregate frequency data. The two null hypotheses considered are (1) constancy of the diagonal elements of the one-step transition probability matrix and (2) an arbitrarily chosen transition probability’s being equal to a specific value. The formation of tests uses a general framework for statistical inference on estimated Markov processes; we also indicate how this framework can be used to form tests for a variety of other hypotheses. The validity and power performance of the two tests formed in this paper are examined in factorially designed Monte Carlo experiments. The results indicate that the proposed tests lead to type I error probabilities which are close to the desired levels and to high power against even small deviations from the null hypotheses considered.     

Permutation methods in relative risk regression models

In this paper, we develop a weighted permutation (WP) method to construct confidence intervals for regression parameters in relative risk regression models. The WP method is a generalized permutation approach. It constructs a resampled history which mimics the observed history for individuals under study. Inference procedures are based on studentized score statistics that are insensitive to the forms of the relative risk function. This makes the WP method appealing in the general framework of the relative risk regression model. First-order accuracy of the WP method is established using counting process approach with a partial likelihood filtration. A simulation study indicates that the method typically improves accuracy over asymptotic confidence intervals.     

Tests based on weighted rankings in complete blocks: exact distribution and monte carlo simulation

Quade (1972, 1979) proposed a family of nonparametric tests based on weighted within-block rankings, for testing the hypothesis of no treatment effects in a complete randomized blocks layout. In this paper we give a table of the exact null distribution of these tests when the number of treatments is 3, the number of blocks is less than or equal to 14 and the block scores are linear. Moreover, a Monte Carlo study was performed to compare the powers of these tests with parametric and nonparametric competitors     

金融发展与出口贸易结构优化

在综述相关文献的基础上，利用协整检验、因果关系检验和脉冲响应函数等计量方法，根据中国1985-2006年的数据，从金融发展的规模、结构和效率三个方面对金融发展与出口贸易结构的关系进行实证分析。实证结果表明：金融发展与出口贸易结构优化之间存在着长期的协整关系，我国要促进金融体制的改革，提高金融效率，进一步促进贸易结构的优化。     

中俄相互投资的母国贸易效应比较

基于2003—2017年中俄双边投资与贸易额,借助协整检验、误差修正模型(ECM)和向量自回归模型(VAR)等方法,分析中国与俄罗斯相互投资分别对母国贸易的影响。研究结果表明:长期来看,中国对俄罗斯投资与双边贸易呈互补效应,而俄罗斯对中国投资却与双边贸易呈现替代效应;短期来看,中俄相互投资对双边贸易均不具有动态关系。中国对俄罗斯低科技含量制成品、高科技含量制成品的出口及初级制成品、资源性制成品和中等科技含量制成品的进口均与其投资之间存在着长期均衡关系;俄罗斯对中国初级制成品的出口、低科技含量制成品和中等科技含量制成品的进出口以及资源性制成品和高科技含量制成品的进口与俄罗斯在中国的投资存在着长期均衡关系。     

A gamma goodness-of-fit test based on characteristic independence of the mean and coefficient of variation

Characterization theorems in probability and statistics are widely appreciated for their role in clarifying the structure of the families of probability distributions. Less well known is the role characterization theorems have as a natural, logical and effective starting point for constructing goodness-of-fit tests. The characteristic independence of the mean and variance and of the mean and the third central moment of a normal sample were used, respectively, by Lin and Mudholkar [1980. A simple test for normality against asymmetric alternatives. Biometrika 67, 455–461] and by Mudholkar et al. [2002a. Independence characterizations and testing normality against skewness-kurtosis alternatives. J. Statist. Plann. Inference 104, 485–501] for developing tests of normality. The characteristic independence of the maximum likelihood estimates of the population parameters was similarly used by Mudholkar et al. [2002b. Independence characterization and inverse Gaussian goodness-of-fit. Sankhya A 63, 362–374] to develop a test of the composite inverse Gaussian hypothesis. The gamma models are extensively used for applied research in the areas of econometrics, engineering and biomedical sciences; but there are few goodness-of-fit tests available to test if the data indeed come from a gamma population. In this paper we employ Hwang and Hu's [1999. On a characterization of the gamma distribution: the independence of the sample mean and the sample coefficient of variation. Ann. Inst. Statist. Math. 51, 749–753] characterization of the gamma population in terms of the independence of sample mean and coefficient of variation for developing such a test. The asymptotic null distribution of the proposed test statistic is obtained and empirically refined for use with samples of moderate size.     

论重复训练与学生计算技能的相关性

本文用教育测量学的方法 ,以数理统计为工具论证了重复训练与学生计算技能之间的相关关系 ,是对教学理论的一种探索。