山村支教志愿者的故事

这里有点像电影《凤凰琴》中的学校,3个教室,5个老师,62个学生分成三个年级(隔年一招生),铁炉子放在每个教室的中间,尽量让它的热量均匀地散发给每一个孩子。校园中除了教室的那排小白房,有三个较高的“建筑物”,一个被风雨侵蚀得裂纹纵     

东北亚的马蹄声

他们身骑战马呼啸而来,一路厮杀,占据了东北亚地区的中心地带,开创了东晋十六国前燕、后燕和北燕近一个世纪的辉煌。     

语法与四个世界关系之断想

用三一语言学的四个世界理论,从语言世界、物理世界、心理世界、文化世界的角度解释语法,可以帮助我们认识语法与四个世界的关系,从而更深刻地理解语法现象.这是语法研究的一个新途径.     

加里·史密斯 沈阳变化太快了

<正>沈阳的发展太快了,记得在两年前刚到这里,看到的是很多拆迁的房屋,路边还有许多正在施工的吊车,可是短短的两年时间就让这里有了太多的改变,一座座崭新现代的建筑物纷纷拔地而起。沈阳,一座旧的城市正在发生着日新月异的变化。加里·史密斯(Gary Smith)感慨地向记者讲述着沈阳城市的变化。     

日本动画类型化思考——以机器人动画为例

本文从类型产生的根源出发,剖析日本机器人动画存在的基础与演变,同时分析其类型如何通过叠加变异形成更丰富的体系,满足大众文化的多种需求.     

统计信息系统与统计信息技术

随着现代统计科学体系的不断完善和信息技术的快速渗透,统计信息系统已逐步成熟并普及,催生了统计信息技术研究领域。文章阐释了统计信息系统概念,并给出统计信息技术体系的基本框架。     

美国家庭资产统计方法和分析

一、引言家庭资产是指家庭拥有或控制的能以货币计量的经济形态,家庭资产由实物资产和金融资产两部分组成,包括各种家庭资产、家庭债权债务和其它权利。家庭资产反映了居民的生活水平,也是衡量国家经济实力的主要依据之一。学者们发现,居民通过家庭资产结构合理化,能够实现跨时间的消费效用最大化(Kelley,1953,Feinberg,1964)。另外,税收制度与家庭资产结构之间存在着关联关系(Bergstresser,2004)。对于一个具体的家庭来说,家庭资产、收入和消费是一个整体性的经济概念,家庭资产的数量和结构,将直接影响个人和家庭的消费形式和数量,进而影…     

Nonparametric Tests for Stratum Effects in the Cox Model

Thispaper considers the stratified proportional hazards model witha focus on the assessment of stratum effects. The assessmentof such effects is often of interest, for example, in clinicaltrials. In this case, two relevant tests are the test of stratuminteraction with covariates and the test of stratum interactionwith baseline hazard functions. For the test of stratum interactionwith covariates, one can use the partial likelihood method (Kalbfleischand Prentice, 1980; Lin, 1994). For the test of stratum interactionwith baseline hazard functions, however, there seems to be noformal test available. We consider this problem and propose aclass of nonparametric tests. The asymptotic distributions ofthe tests are derived using the martingale theory. The proposedtests can also be used for survival comparisons which need tobe adjusted for covariate effects. The method is illustratedwith data from a lung cancer clinical trial.     

Designing and integrating composite networks for monitoring multivariate gaussian pollution fields

Networks of ambient monitoring stations are used to monitor environmental pollution fields such as those for acid rain and air pollution. Such stations provide regular measurements of pollutant concentrations. The networks are established for a variety of purposes at various times so often several stations measuring different subsets of pollutant concentrations can be found in compact geographical regions. The problem of statistically combining these disparate information sources into a single 'network' then arises. Capitalizing on the efficiencies so achieved can then lead to the secondary problem of extending this network. The subject of this paper is a set of 31 air pollution monitoring stations in southern Ontario. Each of these regularly measures a particular subset of ionic sulphate, sulphite, nitrite and ozone. However, this subset varies from station to station. For example only two stations measure all four. Some measure just one. We describe a Bayesian framework for integrating the measurements of these stations to yield a spatial predictive distribution for unmonitored sites and unmeasured concentrations at existing stations. Furthermore we show how this network can be extended by using an entropy maximization criterion. The methods assume that the multivariate response field being measured has a joint Gaussian distribution conditional on its mean and covariance function. A conjugate prior is used for these parameters, some of its hyperparameters being fitted empirically.     

网络、信息与统计

文章探讨在网络技术下,网络、信息与统计三者之间的关系,最终旨在阐述在信息经济时代,统计可能面对的一些挑战.