Comparison of Times Series with Unequal Length in the Frequency Domain

In statistical data analysis it is often important to compare, classify, and cluster different time series. For these purposes various methods have been proposed in the literature, but they usually assume time series with the same sample size. In this article, we propose a spectral domain method for handling time series of unequal length. The method make the spectral estimates comparable by producing statistics at the same frequency. The procedure is compared with other methods proposed in the literature by a Monte Carlo simulation study. As an illustrative example, the proposed spectral method is applied to cluster industrial production series of some developed countries.     

Ordering Properties of Systems with Two Dependent Components

The study of systems with dependent components from a reliability point of view is a very important topic. However, the majority of the articles study the case of independent components. In this article, we study how the dependency influences the performance of the system. We extend some comparison results obtained in the case of independent components to the case of two dependent components. We show that the more diverse the exponential parameters of the two components, the stronger (weaker) the parallel (series) system in the stochastic ordering. We apply our general results to some common bivariate models in the reliability theory.     

Model-Based Estimation of Unemployment Rates in Small Areas of Portugal

The high level of unemployment is a major problem in most European countries nowadays. Hence, the demand for small area labor market statistics has rapidly increased over the past few years. The Portuguese Labour Force Survey is the main source of official statistics at the macro level. However, it was not designed to produce reliable design-based statistics at the micro level due to small sample sizes. The goal of this article is to analyze the performance of model-based small area estimators to estimate the unemployment rate at micro level. Our results showed that the temporal estimator is the most suitable.     

Measuring the cohesiveness of preferences: an axiomatic analysis

In this paper, we axiomatically study how to measure the similarity of preferences in a group of individuals. For simplicity, we refer to this as the cohesiveness. First, we provide axioms that characterize a family of linear and additive measures whose intersection is a partial ordinal criterion similar to first order stochastic dominance. The introduction of some additional properties isolates a one-parameter subfamily. This parameter evaluates the effect on the cohesiveness if one individual changes his ranking on a single pair of objects, as a function of how many of the remaining individuals in the group rank the first object over the second and vice versa. Finally, we characterize the focal measures of this subfamily separately showing that they coincide with measures constructed using two, at first sight, totally different approaches suggested in the literature.     

A New Proposal to Gauge Intergenerational Mobility: Educational Mobility in Europe as a Case Study

This paper is aimed at presenting a new intergenerational mobility index that (a) combines the intergenerational elasticity and the R-squared of the intergenerational regression and (b) enables the expression of the total degree of mobility as the weighted sum of mobility with respect to both parents. As a case study, we apply our proposal to investigate the intergenerational mobility of education in several European countries and its changes across birth cohorts. The results derived from the proposed index indicate that Nordic countries display higher levels of educational mobility than Southern countries, whereas continental countries are in an intermediate position. Moreover, it appears that the degree of mobility increases over time only in those countries with low initial levels and remains stable for the most mobile countries. Finally, for most of the countries the proposed methodology can prove that the degree of educational mobility with respect to each parent tends to converge to the same level over the course of time.     

The Ross-Dunlop debate and union wage concessions: A median voter analysis

The Ross-Dunlop debate concerns the extent to which unions take into account the trade-off between wages and employment in formulating their wage demands. This paper develops a median voter model of union behavior that offers a new approach to resolving the Ross-Dunlop debate. The model shows that when the binding constraint on the median union member in the seniority distribution is the threat of layoff, the union will behave as a “Dunlop-type” union; when the binding constraint is the cost of striking, the union will behave as a “Ross-type” union. The model is then applied to the related issue of union wage concessions. Two questions are examined: Under what conditions will a union agree to wage concessions? How large a cut in wages will be accepted?     

Monopoly,efficient contract,and median voter models of union wage determination: A critical comparison

This article critically compares the monopoly, efficient contract, and median voter models of union wage determination. The models are first analyzed with respect to five theoretical issues: the aggregation of preferences, the principal-agent problem, strike costs, dynamics, and incentive compatibility. The models are then compared with regard to their ability to explain two features of union wage/employment determination: the asymmetric response of union wages to demand shocks and the wide variation in the presence of featherbedding restrictions in union contracts. While all three models suffer from significant short-comings, the median voter model is generally superior. The authors acknowledge the helpful comments of Hank Farber and the financial assistance received from the College of Business Administration, Georgia State University.     

Prospects for the Soviet economy to the year 2000

This article reviews the current state of the Soviet economy, and, after placing it within the broader context of the world economy, provides a number of alternative projections of its future course up to the year 2000. For this purpose an updated structural matrix of the Soviet economy was incorporated into a global structure of the world economy built for the United Nations and described in Leontief, Carter and Petri (The Future of the World Economy. New York: Oxford University Press, 1977). Several important modifications in the structural formulation of the model were carried out in order to account for the projected increased production and export of Soviet natural gas to the end of the century and to incorporate current estimates of Soviet agricultural and military-goods production.     

Gender differences in predicting high-risk drinking among undergraduate students

The purpose of this study was to examine gender differences in college students' high-risk drinking as measured by an estimated blood alcohol concentration (eBAC) based on gender, height, weight, self-reported number of drinks, and hours spent drinking. Using a developmental/contextual framework, high-risk drinking is conceptualized as a function of relevant individual characteristics, interpersonal factors, and contextual factors regularly mentioned in the college drinking literature. Individual characteristics include race, gender, and age; interpersonal characteristics include number of sexual partners and having experienced forced sexual contact. Finally, contextual factors include Greek membership, living off-campus, and perception of peer drinking behavior. This study is a secondary data analysis of 1,422 students at a large university in the Southeast. Data were gathered from a probability sample of students through a mail survey. A three-step hierarchical logistic regression analysis showed gender differences in the pathway for high-risk drinking. For men, high-risk drinking was predicted by a combination of individual characteristics and contextual factors. For women, interpersonal factors, along with individual characteristics and contextual factors, predicted high-risk drinking, highlighting the importance of understanding female sexual relationships and raising questions about women's risk-taking behavior. Implications for prevention and assessment are discussed.     

Redistribution and labour supply

This paper explores the effect of personal income taxes on redistribution when labour supply reactions are taken into consideration. The results indicate that the classical non-behavioural results on redistribution are not necessarily satisfied in a more general behavioural framework. In this respect, it is shown that the relevant transition to measure redistribution is not the transition from the initial post-tax to the final post-tax income distribution, but rather from the more precise initial pre-tax to the final post-tax income distribution. In addition, the necessary and sufficient conditions to ensure redistribution in this wider setting are postulated, which helps determine the behavioural bias under alternative tax and labour supply models. This shows that the functional specification of labour supply may also affect the results.