On some reliability aspects of Pearson family of distributions

We characterize the Pearson family of distributions by finding a relationship between the failure rate and the higher order moments of residual life. We also present a characterization theorem of IFR(DFR) class of distributions in the Pearson family.     

Kernel Density Estimation on a Linear Network

This paper develops a statistically principled approach to kernel density estimation on a network of lines, such as a road network. Existing heuristic techniques are reviewed, and their weaknesses are identified. The correct analogue of the Gaussian kernel is the ‘heat kernel’, the occupation density of Brownian motion on the network. The corresponding kernel estimator satisfies the classical time‐dependent heat equation on the network. This ‘diffusion estimator’ has good statistical properties that follow from the heat equation. It is mathematically similar to an existing heuristic technique, in that both can be expressed as sums over paths in the network. However, the diffusion estimate is an infinite sum, which cannot be evaluated using existing algorithms. Instead, the diffusion estimate can be computed rapidly by numerically solving the time‐dependent heat equation on the network. This also enables bandwidth selection using cross‐validation. The diffusion estimate with automatically selected bandwidth is demonstrated on road accident data.     

Multivariate discrete reversed hazard rates

In the present paper, we define and study four versions of multivariate discrete reversed hazard rates, namely scalar reversed hazard rate, vector reversed hazard rate, alternative reversed hazard rate, and conditional reversed hazard rate. Various properties of these functions are studied. Interrelationships between these reversed hazard rates are explored. We also present characterization of discrete distributions using these reversed hazard rates.     

On characterizing mixtures of some life distributions

Received: October 15, 1998; revised version: January 10, 2000     

The New Zenga curve in the context of reliability analysis

ABSTRACT

In this article, we look into the properties and characterizations of the New Zenga curve. The relationship of the curve with other measures of inequality as well as some reliability concepts are examined. Classification of lifetime distributions using the Zenga curve and an illustration for the behaviour of the curve using a survival data are also provided.     

Foreign Direct Investment,Services Trade Negotiations and Development: The Case of Tourism in the Caribbean

This article examines whether and how developing countries can use services trade negotiations to increase the amount of inward FDI conducive to development. It reviews how services trade rules can affect inward FDI, and employs panel data analysis with innovative use of instrumental variables in the tourism sectors of 9 Caribbean countries during 1997–2003. It argues that Caribbean countries may want to signal openness to inward FDI in GATS, while maintaining a degree of flexibility in the use of policy measures; in the current negotiations with the EU on Economic Partnership Agreements, the focus could be on emphasising the development dimension.     

Setting goals in a professional service firm

Given the complex structure and rapid rate of change of today's society, it is critically important that a professional service firm properly set and periodically monitor its goals. This article describes how one consultant organization has formalized this process. The experience has led to important modifications of their goals. Perhaps a greater benefit is that the process of formalization has been a substantial aid in identifying and sensitizing individuals to crucial issues, in generating and evaluating alternatives, in isolating and resolving conflicts of judgement and priorities, and in communicating among members of the management of the firm concerned.     

Measures for Studying Poverty in Family and Child Research

Most family scholars take the concept of poverty for granted. The variety of ways people have chosen to define and measure this concept, however, often makes it difficult to interpret or compare research results. We review and critique the ways that poverty has been measured in the family and child literatures as well as the measures that have been used to help understand variations in adaptation among those in poverty. In addition to reviewing more common measures, we include discussions of two new measures that have the potential to contribute to the literature on poverty: basic family budgets and social exclusion.     

Structuring Supplier Involvement in New Product Development: A China–U.S. Study

Buying and supplying organizations rely on each other for developing better products in an efficient manner, which explains the popularity of involving suppliers in new product development (NPD). However, such involvement is not always successful, partially due to the challenges of structuring a buyer–supplier team to manage joint dependence and dependence asymmetry. This study adopts an organizational dependence view to examine how three types of intergroup structures—administrative (formalization and centralization), task (task interdependence), and physical (colocation)—influence project performance and buyer learning in NPD projects. Furthermore, adopting a contingency theory perspective, we study whether the national context moderates the effects of intergroup structures on project outcomes. We adopt a two‐group structural equation modeling approach to test hypotheses with survey responses from a sample of NPD projects in the United States (US) and China. Results show different ways in which intergroup structures influence project performance and buyer learning in the two culturally, economically, and institutionally distinct countries. We discuss the implications of these new findings and present directions for future research.     

A Method for Evaluating Transmission Line Magnetic Field Mitigation Strategies That Incorporates Biological Uncertainty

A method to determine how much reduction in public exposure to power frequency magnetic fields can be obtained for different levels of investment is presented. Which if any "effects function" best describes the relationship between field exposure and biological effect is uncertain at this time. Also, in a particular context such as construction of new transmission lines there are a variety of different technologies which might be used to reduce exposure. We describe and demonstrate a method by which exposure reduction supply curves (i.e., the cost of purchasing different amounts of exposure reduction given various mitigation options) can be estimated parametrically for different exposure conditions and effects functions, and we display illustrative results.