Relative Guarantees

Many real-world financial contracts have some sort of minimum rate of return guarantee included. One class of these guarantees is so-called relative guarantees, i.e., guarantees where the minimum guaranteed rate of return is given as a function of the stochastic return on a reference portfolio. These guarantees are the topic of this paper. We analyse a wide range of different functional specifications for the minimum guaranteed rate of return, hereunder both so-called maturity and multi-period guarantees. Several closed form solutions are presented.     

Use of minimum risk approach in the estimation of regression models with missing observations

This article considers a linear regression model with some missing observations on the response variable and presents two estimators of regression coefficients employing the approach of minimum risk estimation. Small disturbance asymptotic properties of these estimators along with the traditional unbiased estimator are analyzed and conditions, that are easy to check in practice, for the superiority of one estimator over the other are derived. Received May 2001     

Locally minimum variance unbiased estimator in a discontinuous density function

The exact forms of the locally minimum variance unbiased estimators and their variances are given in the case of a discontinuous density function.     

Sample Design and Allocation for Random Digit Dialling

Sample design and sample allocation methods are developed for random digit dialling in household telephone surveys. The proposed method is based on a two-way stratification of telephone numbers. A weighted probability proportional to size sample allocation technique is used, with auxiliary variables about the telephone coverage rates, within local telephone exchanges of each substrata. This makes the sampling design nearly “self-weighting” in residential numbers when the prior information is well assigned. A computer program generates random numbers for the local areas within the existing phone capacities. A simulation study has shown greater sample allocation gain by the weighted probabilities proportional to size measures over other sample allocation methods. The amount of dialling required to obtain the sample is less than for proportional allocation. A decrease is also observed on the gain in sample allocation for some methods through the increasing sample sizes.     

烟草商业配送物流设计分析

根据目前烟草配送的现状和发展趋势，着重介绍和分析了烟草商业配送物流设计中件烟存贮和条烟分拣的基本方式，并对相关主要设备和系统案例进行描述。     

在VB.NET中用ADO访问Access数据库的方法

文章介绍了怎样利用VB．NET强大的类开发功能，把ADO访问数据的方法编成组件，完全封装起来，以方便软件开发者访问数据，提高开发效率。     

Minimum Quality Standards under Asymmetric Duopoly with Endogenous Quality Ordering: A Note

In this note, we revisit minimum quality standards (MQS) under a vertically differentiated duopoly. We generalize the model in Ronnen (1991) and Valletti (2000) by introducing asymmetry into the fixed cost of quality improvement and by explicitly taking into account the endogeneity of quality ordering. In the generalized model, we show that the results derived by Ronnen (1991) and Valletti (2000) are largely robust.     

产品包装废弃物的污染与回收利用

产品包装废弃物对生态环境产生严重影响：使城市的生态环境污染加剧．占用大量的耕地，使蚊蝇滋生，造成资源的大量浪费。产品包装废弃物的回收与利用可产生巨大的经济效益和社会效益，但必须解决如下几个问题：地方政府职能缺位、法律体系不健全和有法不依、国民环境意识淡薄及企业社会责任缺失。     

重庆都市型包装工业发展之我见

重庆都市型包装工业规模小，发展缓慢，布局散落，竞争无序，部门纷争严重，企业市场开拓能力弱，且缺乏大企业的有力支撑。但重庆都市型包装工业具有广阔的市场空间，应摆正行业地位，合理空间布局，大中小企业并重，与支柱产业紧密结合，关注绿色概念，并增强行业协会职能。