Multi-level and mixed-level <Emphasis Type="Italic">k</Emphasis>-circulant supersaturated designs

Supersaturated designs (SSDs) constitute an important class of fractional factorial designs that could be extremely useful in factor screening experiments. Most of the existing studies have focused on balanced designs. This paper provides a new lower bound for the \(E(f_{NOD})\)-optimality measure of SSDs with general run sizes. This bound is a generalization of existing bounds since it is applicable to both balanced and unbalanced designs. Optimal multi and mixed-level, balanced and nearly balanced SSDs are constructed by applying a k-circulant type methodology. Necessary and sufficient conditions are introduced for the generator vectors, in order to pre-ensure the optimality of the constructed k-circulant SSDs. The provided lower bounds were used to measure the efficiency of the generated designs. The presented methodology leads to a number of new families of improved SSDs, providing tools for directly constructing optimal or nearly-optimal k-circulant designs by just checking the corresponding generator vector.     

Optimality results on orthogonal arrays plus <Emphasis Type="Italic">p</Emphasis> runs for <Emphasis Type="Italic">s</Emphasis><Superscript><Emphasis Type="Italic">m</Emphasis></Superscript> factorial experiments

The optimality of designs obtained by adding p runs to an orthogonal array is studied for experiments involving m factors each at s levels. The optimality criterion used here, is the Type 1 criterion due to Cheng (1978) which is an extension of Kiefer (1975) universal optimality criterion. Unlike what happens with orthogonal array plus one run designs, the behavior of designs obtained via augmentation of an orthogonal array by p runs depends on the particular runs added.     

A robust VaR model under different time periods and weighting schemes

This paper analyses several volatility models by examining their ability to forecast Value-at-Risk (VaR) for two different time periods and two capitalization weighting schemes. Specifically, VaR is calculated for large and small capitalization stocks, based on Dow Jones (DJ) Euro Stoxx indices and is modeled for long and short trading positions by using non parametric, semi parametric and parametric methods. In order to choose one model among the various forecasting methods, a two-stage backtesting procedure is implemented. In the first stage the unconditional coverage test is used to examine the statistical accuracy of the models. In the second stage a loss function is applied to investigate whether the differences between the models, that calculated accurately the VaR, are statistically significant. Under this framework, the combination of a parametric model with the historical simulation produced robust results across the sample periods, market capitalization schemes, trading positions and confidence levels and therefore there is a risk measure that is reliable.

Value and risk in business-to-business e-banking

The purpose of this paper is to examine the role of risk in the formation of perceptions of value in the b2b domain, specifically within e-banking. The functional relationships between three types of risk (performance, financial and psychological) and the benefits and sacrifices components of value are tested within a broader nomological network that includes e-service quality (as an antecedent of value) and satisfaction, word-of-mouth and intention to switch (as outcomes of value). The hypothesised relationships are tested, using Partial Least Squares, on data collected through a postal survey from 167 UK-based SME organisations. The results confirm the significant but differential impact of the three types of risk on the two value components. Specifically performance risk and financial risk are found to be significant determinants of benefits, while psychological risk impacts on perceptions of sacrifices. We also provide evidence of the differential impact of the benefits and sacrifices components of value on satisfaction, and the existence of both direct and indirect (through satisfaction) impact of these components on word-of-mouth and intention to switch. This is the first documented empirical investigation of the impact of perceptions of risk in the study of perceptions of value within the domain of b2b marketing and consequently offers new insights into the subject matter. The theoretical and managerial implications of the findings are discussed and the manner in which the identified relationships can aid future research are explicated.     

New classes of improved confidence intervals for the variance of a normal distribution

Two new classes of improved confidence intervals for the variance of a normal distribution with unknown mean are constructed. The first one is a class of smooth intervals. Within this class, a subclass of generalized Bayes intervals is found which contains, in particular, the Brewster and Zidek-type interval as a member. The intervals of the second class, though non-smooth, have a very simple and explicit functional form. The Stein-type interval is a member of this class and is shown to be empirical Bayes. The construction extends Maruyama’s (Metrika 48:209–214, 1998) point estimation technique to the interval estimation problem.     

Book Review

This article presents the findings of an investigation into issues related to product standardisation in service industries. A brief review of existing literature on the subject is followed by a presentation of the findings of parallel surveys carried out at two UK holiday villages owned and operated by a leading European leisure company. The conclusions reached were that a service product can be successfilly standardised in the mind of the consumer but only if a clear positioning strategy is adhered to.     

Investigating corporate management lobbying in the U.K. accounting standard-setting process: a multi-issue/multi-period approach

A large body of literature examines the motives of corporate managers to lobby accounting standard-setters. In general, studies confine their examination to single episodes of the standard-setting process (e.g., exposure draft). This article extends the literature by adopting a multi-issue/multi-period approach to investigate corporate lobbying of the U.K.'s ASB. The findings suggest that the extent of corporate lobbying, defined on the basis of the frequency with which companies made submissions to all of the publications issued by the ASB over a six-year period, depends on the size of companies, the debt covenant costs they face and whether they are listed on a U.S. stock exchange. Separate analyses, however, involving (a) the frequency of lobbying on income-related issues and (b) the frequency of lobbying on disclosure issues revealed that, while all these three variables explain lobbying on income-related issues, only size is significant in explaining lobbying on disclosure issues. The results also suggest that the debt to equity ratio is an imperfect proxy for debt covenant costs.     

Optimizing international portfolios with options and forwards

We develop a stochastic programming model to address in a unified manner a number of interrelated decisions in international portfolio management: optimal portfolio diversification and mitigation of market and currency risks. The goal is to control the portfolio’s total risk exposure and attain an effective balance between risk and expected return. By incorporating options and forward contracts in the portfolio optimization model we are able to numerically assess the performance of alternative tactics for mitigating exposure to the primary risks. We find that control of market risk with options has more significant impact on portfolio performance than currency hedging. We demonstrate through extensive empirical tests that incremental benefits, in terms of reducing risk and generating profits, are gained when both the market and currency risks are jointly controlled through appropriate means.     

THE SUBSTANCE OF ACCOUNTING FOR PUBLIC‐PRIVATE PARTNERSHIPS

This article evaluates Public‐Private Partnerships (PPP) accounting practice and the related financial accounting and reporting requirements. Governments across the world are seeking to access private finance to improve public infrastructure. Accounting for PPPs has encountered many difficulties, one of which is the practice by which PPPs are not accounted for as fixed assets on the balance sheet of either the public sector client or the private sector operator. Accounting for PPPs has grown in importance at a time of transition from national Generally Accepted Accounting Practice (GAAP) to International Financial Reporting Standards (IFRS). Under UK GAAP, both client and operator accounting adopt the reasoning – familiar from leasing standards – of the allocation of risks and rewards between the parties to determine the party which should recognize the fixed asset on its balance sheet. The gap in IFRS with regard to operator accounting has been filled by the interpretation IFRIC 12 on service concession agreements: this moves the reasoning from risks and rewards to control, familiar from consolidation standards. The UK Treasury and the International Public Sector Accounting Standards Board (IPSASB) have required/proposed the adoption of the mirror‐image treatment of IFRIC 12. In most, but not all, cases, control will be assessed to rest with the client, which will recognize property, plant and equipment, and not with the operator, which will recognize either a financial asset or an intangible asset on the basis of an assessment of which party bears the majority of risks and rewards. Under both UK GAAP and IFRS, accounting policy choices are strongly influenced by, for the client, governmental control frameworks, and for the operator, by the implications for the profile of distributable profits and for taxation. An important public policy issue is that the national accounts, which for European Union member states must comply with European System of Accounts 1995, will remain on a risks and rewards basis. It is these numbers that will be used in assessments of macro‐fiscal policy and fiscal risks, notwithstanding that the Eurostat version of risks and rewards is even more open to manipulation than were the national financial reporting standards.     

Economics in the pre-college curricluum

This study analyzes the effects of integrating economics into the social studies curriculum and the effects of participation in the Stock Market Game (SMG) on the Maryland School Performance Assessment Program (MSPAP) economics outcome scores. The study was carried out using state summary and disaggregated data and summary data for each school system in Maryland. The 1992 and 1994 MSPAP economics outcome scores for grades 3, 5, and 8 constituted the dependent variable with the level of integration of economics in the curriculum and the level of participation in the SMG being the main explanatory variables. Using comparative static analysis, two related but separate questions were addressed. The first question asks how school systems with different levels of integration of economics in the curriculum and with different levels of participation in the SMG compare to the state average. The second question asks how these groupings compare to each other. It is this second question that lends itself to more rigorous hypothesis testing.Funding for this project was provided in part by the Securities Industry Foundation for Economic Education, the Council on Economic Education in Maryland, and the Towson State University Faculty Development and Research Committee.