Bayesian D-optimal supersaturated designs

We introduce a new class of supersaturated designs using Bayesian D-optimality. The designs generated using this approach can have arbitrary sample sizes, can have any number of blocks of any size, and can incorporate categorical factors with more than two levels. In side by side diagnostic comparisons based on the E(s²)$E(s^2)$ criterion for two-level experiments having even sample size, our designs either match or out-perform the best designs published to date. The generality of the method is illustrated with quality improvement experiment with 15 runs and 20 factors in 3 blocks.     

Mediated Political Communication in Australia: leading issues,new evidence

New 2007 survey data on political communication is used to study the relation between commercial and ABC/SBS television consumption and Australian political and civic culture. The first section outlines the demographic characteristics of viewers who rely, respectively, for their news and current affairs, on commercial as compared with public service television. This is followed by a profile of popular views on the concentration of media ownership in Australia. The paper then shows that levels of trust in other people are higher for those who rely on public service television. Similarly, knowledge about basic constitutional facts is shown to be positively related to a preference for public service television news consumption. The same holds for civic engagement. The conclusions imply that Australians generally favour stronger public interest regulation of commercial television broadcasting. The conclusion explains that media regulation in Australia generally lags behind public preferences for a more explicitly democratic regulatory regime.     

Revolution,war and modernization: Population policy and fertility change in Iran

Fertility trends in Iran over recent decades can be plausibly related to a number of causal factors. Population policy shifts were quite marked, and were related to political upheaval and war, which influenced both official policy and popular perceptions of the nation’s need for children. A range of developmental factors were also important. The key fertility trends to be explained include the rise to an exceptionally high level in the early 1980s (a TFR of just below 7), and the speed of the subsequent decline to a TFR of about 2.7 in 1996. As well as estimating the proximate determinants of these trends, the paper sets them in their political and developmental context. Iran’s fertility trends are then compared with those of Islamic countries of North Africa and West Asia to gain additional insights into possible causal factors. An adequate explanation of fertility change in Iran needs to draw on elements of a number of theories of fertility transition.     

Inter-Organizational Learning and Strategic Renewal in SMEs: Extending the 4I Framework

This article explores how mature SMEs which lack internal resources access external knowledge to facilitate strategic renewal. Organizational learning, in contrast to entrepreneurial learning, recognizes that owner-managers must distribute knowledge throughout the firm to achieve competitive benefits. Three case studies demonstrate how external ‘knowledge providers’ (customers, suppliers and educational institutions) help institutionalize ‘new’ knowledge. Initially, learning from inter-organizational relationships requires owner-managers to be proactive in accessing and extending appropriate inter-organizational relationships. Second, external organizations can play an active role by ‘intertwining’ knowledge to support the development of processes, systems and routines that distribute and institutionalize learning throughout the organization. The three cases have practical implications for owner-managers and add to academic knowledge via the extension of Crossan et al's 4I model of organizational learning.     

FOURIER SERIES ESTIMATION FOR LENGTH BIASED DATA

This paper proposes and investigates Fourier series estimators for length biased data. Specifically, two Fourier series estimators are constructed and studied based on ideas of Jones (1991) and Bhattacharyya et al. (1988) in the case of kernel density estimation. Approximate expressions for mean squared errors and integrated mean squared errors are obtained and compared, and some simulated examples are investigated. The Fourier series estimator based on the proposal of Jones seems to have the more desirable properties of the two. The paper concludes with some comments that put this work in a wider context.     

Unemployed fathers and their children: Implications for policy and practice

This paper reviews the literature on the family effects of unemployment in order to specify how changes in the economy might effect fathering during periods of unemployment. The purpose for doing so is to provide information to clinicians on how job loss effects family dynamics. This paper is organized around three variables that are seen as influencing the father and child relationship. These variables are: the father's reaction to job loss, the mother's reaction to job loss, and the characteristics of the child. The paper ends with a discussion of the policy and practice implications of the literature.     

Split-plot designs for robust product experimentation

Genichi Taguchi has emphasized the use of designed experiments in several novel and important applications. In this paper we focus on the use of statistical experimental designs in designingproducts to be robust to environmental conditions. The engineering concept of robust product design is very important because it is frequently impossible or prohibitively expensive to control or eliminate variation resulting from environmental conditions. Robust product design enablesthe experimenter to discover how to modify the design of the product to minimize the effect dueto variation from environmental sources. In experiments of this kind, Taguchi's total experimental arrangement consists of a cross-product of two experimental designs:an inner array containing the design factors and an outer array containing the environmental factors. Except in situations where both these arrays are small, this arrangement may involve a prohibitively large amount of experimental work. One of the objectives of this paper is to show how this amount of work can be reduced. In this paper we investigate the applicability of split-plot designs for thisparticular experimental situation. Consideration of the efficiency of split-plot designs and anexamination of several variants of split-plot designs indicates that experiments conductedin a split-plot mode can be of tremendous value in robust product design since they not only enable the contrasts of interest to be estimated efficiently but also the experiments can be considerably easier to conduct than the designs proposed by Taguchi.     

Private sector union decline and structural employment change, 1970–1988

Studies of the large decline in private sector unionism during the 1970s and 1980s focus on explanations particular to those decades and attribute an inconsequential role to the employment shift from goods-producing to service-producing industries. Using an adapted version of the Ashenfelter-Pencavel model, this research finds stable parameter estimates between the two decades and the earlier post-Wagner Act years. Not only are decade-specific explanations found to be unnecessary in understanding membership decline, but the pivotal relationship in the decline is the relative shift in the employment distribution away from the traditionally strongly unionized industries.