The use of the scaling property in a frontier analysis of a system of equations

ABSTRACT

This article presents a one-stage efficiency frontier analysis based on the scaling property. This type of analysis is a not very often applied in empirical work in spite of its nice features. Due to the scaling property the influence of exogenous (managerial) variables on efficiency can be modelled and estimated in one stage. It also opens the possibility of estimating a system of equations, consisting of a cost function and the corresponding cost share equations. The model is applied to a unique data set of Dutch secondary education school boards in the period 2007–10, not only consisting of regular data on cost, inputs and outputs, but also of specific data on operational management. The model provides reliable and plausible estimates for the cost efficiency, scale elasticity, and technical change. Average cost efficiency is about 96%. Economies of scale prevail for school boards with size less than 0.8 times average size, whereas annual productivity growth is 2.2% on average.     

Salespersons' self‐monitoring: Direct,indirect, and moderating effects on salespersons' organizational citizenship behavior

Research into self‐monitoring (SM) confirms that people differ when it comes to how much they observe, regulate, and control themselves in certain social settings and interpersonal relationships. Research also shows that high self‐monitors, as opposed to low self‐monitors, perform better in boundary‐spanning positions that require good communication skills. Therefore, it is a matter of interest to analyze the effects of SM on salespeople's behavior, and on organizational citizenship behavior (OCB) in particular. It has been proven that this behavior affects the performance of organizations and influences supervisors' evaluations of subordinates. Although a number of studies examine the antecedents of OCB, certain relationships have yet to be looked at. This study proposes and tests a model stating that salespersons' OCB is determined by salespersons' SM, with this relationship being mediated by salespersons' person–organization (PO) fit and job satisfaction. This study also analyzes the moderating effect of salespersons' SM on PO fit to job satisfaction relationships, as well as on job satisfaction to OCB relationships. Data collected from 122 supervisor–salesperson dyads in 35 companies across 9 different sectors confirm the proposed model. In fact, the results show that SM, both directly and indirectly, has a positive effect on OCB due to the way in which it influences salespersons' PO fit and job satisfaction. The results also confirm the moderating role of SM in the relationships between job satisfaction and OCB, and between PO fit and job satisfaction. Certain implications of this study, as well as directions for future research, are also addressed. © 2009 Wiley Periodicals, Inc.     

BAYESIAN ANALYSIS OF AGGREGATE LOSS MODELS

This paper describes a Bayesian approach to make inference for aggregate loss models in the insurance framework. A semiparametric model based on Coxian distributions is proposed for the approximation of both the interarrival time between claims and the claim size distributions. A Bayesian density estimation approach for the Coxian distribution is implemented using reversible jump Markov Chain Monte Carlo (MCMC) methods. The family of Coxian distributions is a very flexible mixture model that can capture the special features frequently observed in insurance claims. Furthermore, given the proposed Coxian approximation, it is possible to obtain closed expressions of the Laplace transforms of the total claim count and the total claim amount random variables. These properties allow us to obtain Bayesian estimations of the distributions of the number of claims and the total claim amount in a future time period, their main characteristics and credible intervals. The possibility of applying deductibles and maximum limits is also analyzed. The methodology is illustrated with a real data set provided by the insurance department of an international commercial company.     

Forecasting Heavy‐Tailed Densities with Positive Edgeworth and Gram‐Charlier Expansions*

This article presents a new semi‐nonparametric (SNP) density function, named Positive Edgeworth‐Sargan (PES). We show that this distribution belongs to the family of (positive) Gram‐Charlier (GC) densities and thus it preserves all the good properties of this type of SNP distributions but with a much simpler structure. The in‐ and out‐of‐sample performance of the PES is compared with symmetric and skewed GC distributions and other widely used densities in economics and finance. The results confirm the PES as a good alternative to approximate financial returns distribution, specially when skewness is not severe.     

Spatial modeling of stock market comovements

We model the complex global dependencies in international financial markets using spatial techniques. Our methodology allows us to go beyond conventional correlation analyses and volatility-spillover models confined to studying pairwise relationships, and improves the accuracy of return predictions. We find that stock market comovements are unrelated to geographical proximity, and that financial linkages, as measured by foreign direct investment (FDI) ties, are important in accounting for markets comovements. Our results suggest that the proposed measure of financial distance, coupled with spatial methodology, captures fairly accurately the dependencies in the world financial markets, providing important implications for policymaking and portfolio management.     

Risk aversion under preference uncertainty

We show that if an agent is uncertain about the precise form of his utility function, his actual relative risk aversion may depend on wealth even if he knows his utility function lies in the class of constant relative risk aversion (CRRA) utility functions. We illustrate the consequences of this result for optimal asset allocation: poor agents that are uncertain about their risk aversion parameter invest less in risky assets than wealthy investors with identical risk aversion uncertainty.     

Economic conditions, enforcement, and criminal activities in the district of Abidjan

Based on 1978?C2007 annual data on crimes recorded by the criminal police division and through a simultaneous equations model, we have shown that the probability of apprehension affects negatively the incidence of thefts and homicides as well as the incidence of aggregate crime. We have also provided evidence that exogenous shocks such as the devaluation of the CFA franc, the military coup d??état, and the civil war have significantly influenced criminal activity in Abidjan. The civil war which occurred in C?te d??Ivoire, while driving to a booming of property crimes, has deterred violent crimes given the crackdown effect of temporary massive presence of military and paramilitary forces in the streets of the city of Abidjan. In addition, using a sample of 1,600 households, our inquiry on the likelihood of crime victimization has pointed out that the risk of being victimized of any kind of crime increases with the income; the fact of being displaced due to the civil war and the decrease in the number of police stations in the neighborhood.     

The long-horizon returns behaviour of the Portuguese stock market1

In the last few years several research studies have challenged the traditional weak-form efficiency tests of the stock market. These studies suggested an alternative to the random walk model, containing temporary and permanent components. If stocks follow such a model then the traditional tests, using returns computed for short intervals would be unable to detect them. To investigate the evidence for such models in the Portuguese stock market ten stock indexes were created. This is a pioneer study of the Portuguese stock market, and uses nominal, real and excess returns, computed for longer horizons. Three methodologies were used: variance ratios, ordinary least squares regressions and weighted least squares regressions. The statistical significance of the results was studied using traditional parametric tests as well as non-parametric tests. The evidence is mixed, as the presence of tendencies towards mean aversion and mean reversion were detected. Results also show that the evidence is very sensitive to the methodology used and the signifcance tests performed. These results, however, do not necessarily reject the weak-form market efficiency hypothesis.     

Transferring human resource practices from the United Kingdom to China: the limits and potential for convergence

Substantial effort has been devoted to exploring the transfer of human resource management practices within multinational companies. Particular attention has been paid to countries with ‘strong’ HRM traditions, to transfers between economically developed countries and to firms in the manufacturing sector. This paper addresses the transfer of a British-owned retail firm's HRM practices from the United Kingdom to the People's Republic of China. From a variety of perspectives the expectation might be that the transfer of parent-country practices in this instance would be limited: HRM has not been considered a particular strength of UK firms; retail firms operate in a multi-domestic context directly serving local customers rather than as part of an integrated international production network; and there is a high cultural distance between the UK and China. When this multinational retailer entered the China market the express intention was to replicate as nearly as possible the management style of its UK stores. This paper examines the extent to which the firm's parent-country HRM practices, which the company increasingly considers as a key source of competitive advantage, have in fact been transferred to the Chinese stores. The paper seeks to provide fresh insights on the phenomenon of transfer by adopting a qualitative case study approach. This study also focuses on shopfloor employees' perspectives rather than purely the view of managerial staff, as has tended to be the case. Several aspects of HRM transfer are explored briefly: communication with the workforce, work pattern, age composition of the workforce, reward system, training, and employee representation. Attention then focuses on the transfer of the firm's relatively flat organizational structure to a country which is perceived to place a high value on hierarchy, and where hierarchies tend to be quite rigid and clearly demarcated. This provides useful insights into the nature of the transfer process. It is suggested that structural dimensions such as the country of origin, the degree of international production integration and the nature of product markets appear to have less utility in explaining the transfer of HRM practices than institutional and cultural features of the host-country environment and, above all, specific firm-level practices and the presence of expatriates in key management roles.