Software for Learning and for Doing Statistics

The community of statisticians and statistics educators should take responsibility for the evaluation and improvement of software quality from the perspective of education. The paper will develop a perspective, an ideal system of requirements to critically evaluate existing software and to produce future software more adequate both for learning and doing statistics in introductory courses. Different kinds of tools and microworlds are needed. After discussing general requirements for such programs, a prototypical ideal software system will be presented in detail. It will be illustrated how such a system could be used to construct learning environments and to support elementary data analysis with exploratory working style.     

烯烃装置的绩效分析—一种微观经济的比较研究方法

所罗门管理咨询公司（SAI）是成立于1981年一家美国咨询公司，其经营特色是通过研究企业（客户）绩效确定其获得成功的关键因素，并通过同类企业绩效对比研究的方法，为企业（客户）指明改进绩效跻身先进的途径和措施，创建20年来以其独有的服务特色和经营理念赢得了广大客户，行业覆盖面由初始的炼油，扩大到目前包括石油，化工，造纸，汽车制造，运输，电力，银行等多个领域，成为在某些行业，特别是炼,石化行业颇具声誉的咨询机构，其中企业绩效分析评估更是该公司时间最久，又最具领先地位的核心业务，即以石化行业中的烯烃工厂为例，就已八，九十家作为客户参与其每二年一次的绩效分析活动，我国于1998年开始有一家参与了ASI的第7次全球烯烃绩效分析，参评情况当时就受到了业内领导层重视，以国于1998年开始有一定参与了SAI的第7次全球烯烃绩效分析，参评情况当时就受到了业内领导层重视，以后陆续又有多家企业参加，使这一方法在国内有愈来愈大的影响，希望了解并对此感兴越的人士也逐渐增多，为了实践本刊关注新热点的报道方针，本刊在2000年即着大的影响，希望了解并对此感兴越的人士也逐渐增多，为了实践本直关注新热点的报道方针，本刊在2000年邓着手组织有关这方面的搞件，本文即为其中之一，由于出版安排的原因（其中也有尽先刊载SAI作者来稿的考虑），延至本期才得以达览，而其间，应《 乙烯工业》要求，在该刊2001年第1期上先行发表，则是为了配合中石化集团公司七展烯烃装置绩效比较分析活动的需要，所作出的适应性调整而为之的，请读者谅察，同时本刊热希望并允迎已尼参与此项工作的科技，经济工作者，充分利用本刊这个载体，就绩效分析这个题目，与读者进行更具体，更务实的沟通与交流。所罗门管理咨询公司（SAI）的烯烃装置绩效分析方法是一种将同行各装置进行相对比较，然后确定各装置在其产的相对位置的方法，该方法与国内现行的竞争力分析方法相比更具科学性和可比性，此方法中包含了许多国内企业比较陌生的概念和做法，在此对该方法的特点，作用以及参评装置在提供数据时应注意的问题作了简单介绍，并以国内较早参与此项工作的J装置为例，介绍了该方法进行了情况。     

石化企业乙烯物料平衡的实例分析

乙烯物料平衡是石化企业的主要物料平衡之一，由于乙烯衍生物的装置较多，影响石化企业乙烯物料平衡的因素也多。在分析了S企业的四个实例后，可以看出，搞好乙烯的物料平衡工作，可以提高乙烯下游装置的开工率和负荷率，从而提高企业的经济效益。     

Trends in Hydrological Parameters of a Southern Brazilian Watershed and its Relation to Human Induced Changes

The Piracicaba river basin is a subtropical watershed located in the southeastern region of Brazil. With an area of 12 400 km², the basin is a typical example of new landscape resulting from development in tropical and sub-tropical regions: establishment of intensive industrial and agricultural processes were followed by significant population growth and water management. This scenario has led to significant increase in water demand and decrease in water quality. The main objective of this study is the detection of changes in the patterns of flow and precipitation in the basin, and its possible relation to man-induced changes. Statistical analyses were performed on records of precipitation, evapotranspiration and streamflow, from 1947 to 1991. Precipitation and evapotranspiration totals showed significant increasing trends for the entire basin. From eight streamflow gauge stations, half showed significant decreasing trend. The most probable cause of such trends is the export of water from the basin to the metropolitan region of São Paulo city.     

The Information Content of Nonfinancial Performance Measures in the Airline Industry

This research extends the literature on nonfinancial performance measures (NFPMs) by assessing (1) the information content of a broader set of NFPMs and (2) whether NFPMs provide information not provided by financial performance measures (FPMs) from all previously identified FPM categories, rather than just earnings and book value. Specifically, exploratory and confirmatory factor analysis results presented in this paper demonstrate that nineteen NFPMs of major airlines capture seven underlying constructs not captured by eighteen common FPMs. Additionally, this research develops reliable composite measures of the identified performance measure constructs, which prior research argues are superior to individual performance measures.     

区域内旱情监测站点的布设研究

本文对北京通州辖区范围内组织的大规模的土壤墒情调查数据进行总结。基于地理统计、空间分析以及统计学知识，分析了北京通州旱情分布形势。运用数值分类学的知识对测量数据进行了聚类分析，同时用DB(DaviesBouldin)指标准则研究了区域内合理布设旱情监测站的数量及位置，为建立旱情监测站点提供了理论依据。     

Wage and Price Inflation in Poland in the Period of Transition: The Cointegration Analysis

The paper focuses on the long run relationships between wages, prices and labour productivity in the Polish economy by applying recent developments in the field of multivariate cointegration analysis. We followed modeling strategy which is suggested by Greenslade et al. (1999) and present all stages of the analysis which leads to the fully economically identified system of equations representing long run relationships. The investigation is based on the quarterly data from 1992.1 to 1999.2 which covers the period of transition of the Polish economy from the centrally planned system towards the market one. Basing on the empirical results we can argue that wages (costs) were one of the main forces driving inflation in Poland during that period. Also labor productivity proved to be stimulated by the increase of the real wages. On the other hand the hypothesis concerning the relationship between wages and unemployment was rejected by the data.     

战后日本经济发展中积极财政政策的研究

战后，在实现经济恢复和高速发展过程中，日本政府高度重视财政政策的宏观调控作用，在运用财政政策调节经济方面开辟了一条符合本国国情、突出本国特点的路子．对日本战后积极财政政策进行分析和评价，对我国经济发展具有重要的参考借鉴意义。     

安徽省长江干堤的几种加固措施

安徽省境内765km的长江干堤，由于均是在原来旧堤的基础上经逐年加高培厚的，修筑时均未按设计要求施工，致使堤身密实度不够，新老堤土之间结合不牢，在汛期高水位时易产生渗漏。20世纪70年代以来，安徽省高度重视对长江干堤渗漏隐患的处理，经过长期的实践，逐渐摸索出一套行之有效的除险加固方法，如锥探灌浆、灭杀白蚁、冲抓套吉、垂直铺塑防渗、粘土铺盖及压渗盖重等处理措施。使长江干堤的渗漏隐患得以基本消除，其具体作法可供类似工程借鉴。