Position in formal structure, personal characteristics and choices of advisors in a law firm: A logistic regression model for dyadic network data

This paper presents a statistical model for the analysis of binary sociometric choice data, the p₂ model, which provides a flexible way for using explanatory variables to model network structure. It is applied to examine the influence of the formal structure of an organization on interactions among its members. It is shown to provide a general and precise method for addressing this substantive issue. We identify the respective effects of position in the formal structure (status, seniority, division of work and office membership) and selected personal characteristics of members of a corporate law firm on their choices of advisors. Flows of advice are shown to be consistently shaped by status games and the pecking order in the firm. Other dimensions help members in mitigating the effect of this strong rule. This approach ultimately provides more understanding of how members of such firms try to balance cooperation and competition in terms of access to and management of key resources.     

More Efficient Tests Robust to Heteroskedasticity of Unknown Form

In the presence of heteroskedasticity of unknown form, the Ordinary Least Squares parameter estimator becomes inefficient, and its covariance matrix estimator inconsistent. Eicker (1963) and White (1980) were the first to propose a robust consistent covariance matrix estimator, that permits asymptotically correct inference. This estimator is widely used in practice. Cragg (1983) proposed a more efficient estimator, but concluded that tests basd on it are unreliable. Thus, this last estimator has not been used in practice. This article is concerned with finite sample properties of tests robust to heteroskedasticity of unknown form. Our results suggest that reliable and more efficient tests can be obtained with the Cragg estimators in small samples.     

Financing retirement pensions: Pay-as-you-go and funded systems in the European Union

The techniques used to finance retirement pensions in the European Union are extremely varied, as are schemes'institutional frameworks. The standard distinction between pay-as-you-go and funded systems obscures the fact that there are four main types of schemes, each with very distinct methods of regulation and conditions of long-term viability. An analysis of the current procedures reveals the extent to which the schemes'ways of operating differ, and points to considerable variations in the way the social actors participate in the process of regulation. The adaptation of pension systems to new realities is dependent on factors which go far beyond a simple choice between two basic methods of financing.     

A Bayesian approach to statistical inference in stochastic DEA

Stochastic DEA can deal effectively with noise in the non-parametric measurement of efficiency but unfortunately formal statistical inference on efficiency measures in not possible. In this paper, we provide a Bayesian approach to the problem organized around simulation techniques that allow for finite-sample inferences on efficiency scores. The new methods are applied to efficiency analysis of the Greek banking system for the period 1993–1999. The results show that the majority of the Greek banks operate close to best market practices.     

A unified approach to multilevel sample selection models

Abstract

We propose a unified approach for multilevel sample selection models using a generalized result on skew distributions arising from selection. If the underlying distributional assumption is normal, then the resulting density for the outcome is the continuous component of the sample selection density and has links with the closed skew-normal distribution (CSN). The CSN distribution provides a framework which simplifies the derivation of the conditional expectation of the observed data. This generalizes the Heckman’s two-step method to a multilevel sample selection model. Finite-sample performance of the maximum likelihood estimator of this model is studied through a Monte Carlo simulation.     

The Opportunities and Constraints to Collaboration in Public Sector Management

Public Organization Review - This article synthesizes current insights about the opportunities and constraints to collaborative public management. Despite the swath of research on...     

Pensions in the European Union: Adapting to Economic and Social Changes

Throughout the European Union, pension schemes are undergoing a process of adaptation to a completely different context. Some of the main stumbling blocks to this process are the great number of issues involved and the diversity of questions that these raise: demographic changes, the labour market, economic growth, social justice, the ways of regulating the established provisions and decision-making in their regard. These dimensions do not offer ready-made answers, from the standpoint of pension financing. Apart from the complexity of the situation, however, a fundamental component of European societies is definitely at stake here: the ability to guarantee a decent level of security to all citizens when they reach retirement age.     

The Optimal Income Taxation of Couples

This paper analyzes the general nonlinear optimal income tax for couples, a multidimensional screening problem. Each couple consists of a primary earner who always participates in the labor market, but makes an hours‐of‐work choice, and a secondary earner who chooses whether or not to work. If second‐earner participation is a signal of the couple being better (worse) off, we prove that optimal tax schemes display a positive tax (subsidy) on secondary earnings and that the tax (subsidy) on secondary earnings decreases with primary earnings and converges to zero asymptotically. We present calibrated microsimulations for the United Kingdom showing that decreasing tax rates on secondary earnings is quantitatively significant and consistent with actual income tax and transfer programs.