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171.
长期以来,我国体育院校田径术科教学始终未能改变竞技化模式.教学内容以竞技运动为主,手段大同小异,缺乏年龄、性别、专业特点,严重影响大、中、小学“体育与健康”课程目标的实施.在田径术科教学时数递减和学校体育“健康第一”的指导思想下,采用“项群归类”的方法拓宽田径健身教学内容,提高学生的田径综合知识及教学能力,不失为培养“体育与健康”课程目标所需人才的可行之径. 相似文献
172.
史素昭 《广州大学学报(社会科学版)》2002,1(10):22-25
本文认为白居易的闲适诗以元和十年诗人被贬江州司马为界 ,分为前后两期。前期多写作者从政之余的悠闲之乐 ,也时杂仕途险恶的忧疑 ;后期多乐天知命、明哲保身之作。他的闲适诗大都诗意含蓄、韵味盎然 ,表现出一种圆熟和自然流丽之美 ,在艺术上达到了很高的成就 相似文献
173.
数据库营销在西方发达国家的企业里已相当普及,因为它已成为一个企业在新的时代建立新的竞争优势的有力工具。而在国内,很多企业对数据库营销存在着不同程度的误解甚至完全不知,在我国已经加入WTO、世界经济一体化的今天的确让人担忧。这也是我们对该问题进行分析研究的动因。 相似文献
174.
中国海事系统的职位分类管理 总被引:3,自引:0,他引:3
通过对中国海事系统的实地调研,运用工作分析和职位分类的理论,分析在中国海事系统职位分类管理中存在的职位分析不到位、职位说明不规范、职位分类不科学、职级设置不合理、职位管理的环境适应性差等问题,提出改进职位分析、岗位设置、职级设计、职位说明书和岗位轮换的思路。 相似文献
175.
A common problem in medical statistics is the discrimination between two groups on the basis of diagnostic information. Information on patient characteristics is used to classify individuals into one of two groups: diseased or disease-free. This classification is often with respect to a particular disease. This discrimination has two probabilistic components: (1) the discrimination is not without error, and (2) in many cases the a priori chance of disease can be estimated. Logistic models (Cox 1970; Anderson 1972) provide methods for incorporating both of these components. The a posteriori probability of disease may be estimated for a patient on the basis of both current measurement of patient characteristics and prior information. The parameters of the logistic model may be estimated on the basis of a calibration trial. In practice, not one but several sets of measurements of one characteristic of the patient may be made on a questionable case. These measurements typically are correlated; they are far from independent. How should these correlated measurements be used? This paper presents a method for incorporating several sets of measurements in the classification of a case. 相似文献
176.
毒隐翅虫研究进展 1名称,分类与生物学 总被引:1,自引:0,他引:1
郑发科 《西华师范大学学报(自然科学版)》1988,(4)
本文论及毒隐翅虫的学名、俗名、分类与生物学.该属棣于毒隐翅虫亚科的毒隐翅虫族. 相似文献
177.
Jerzy K. Baksalary 《Revue canadienne de statistique》1988,16(1):97-102
A new necessary and sufficient condition is derived for the equality between the ordinary least-squares estimator and the best linear unbiased estimator of the expectation vector in linear models with certain specific design matrices. This condition is then applied to special cases involving one-way and two-way classification models. 相似文献
178.
Two probabilistic model induction techniques, cart and constructor, are compared, via a series of experiments, in terms of their ability to induce models that are both interpretable and predictive. The experiments show that, although both algorithms are able to deliver classifiers with predictive performance close to that of the optimal Bayes rule,constructor is able to generate a probabilistic model that is more easily interpretable than the cart model. On the other hand, cart is a more mature algorithm and is capable of handling many more situations (e.g., real-valued training sets) thanconstructor. A variety of characteristics of both algorithms are compared, and suggestions for future research are made. 相似文献
179.
James R. Walker 《Journal of population economics》2002,15(4):773-782
This note reviews and evaluates Taşıran's (1995) claim that estimated female wage effects on Swedish fertility dynamics reported
by Heckman and Walker (1990) are not robust to the use of microwage data. The results reported here indicate that once individual
wage measures have been purged of measurement error, estimated female wage effects are not sensitive to the introduction of
microwages. The results reported by Heckman and Walker (1990) persist even with the use of microwage data.
Received: 8 March 1996/Accepted: 4 December 2001
I thank Tom MaCurdy, Eric French and two anonymous referees for useful comments. This research was supported by NICHD grants
HD-19226 and HD-28685. The usual disclaimer applies. Responsible editor: Klaus F. Zimmermann. 相似文献
180.
J.M. Wilson 《Omega》1996,24(6):681-688
A series of approaches is presented to formulate statistical classification problems using integer programming. The formulations attempt to maximize the number of observations that can be properly classified and utilize single function, multiple function and hierarchical multiple function approaches to the problems. The formulations are tested using standard software on a sample problem and new approaches are compared to those of other authors. As the solution of such problems gives rise to various awkward features in an integer programming framework, it is demonstrated that new approaches to formulation will not be completely successful in avoiding the difficulties of existing methods, but demonstrate certain gains. 相似文献