METRIC VS. NONMETRIC PROCEDURES FOR MULTIATTRIBUTE MODELING: SOME SIMULATION RESULTS *

Nonmetric procedures such a MONANOVA have been developed to estimate attribute utilities with ranked observations. It is argued that the goodness of the estimation procedure is another criterion which favors a metric procedure like Ordinary Least Squares (OLS) Regression. MONANOVA and OLS Regression are compared in their ability to recover attribute utilities with both ranked and scaled observations.     

Emergence of Selective Social Referencing in Infancy

Seven and 10‐month‐old infants were presented with a remote‐controlled toy dog that intermittently barked at 30‐sec intervals as they faced an experimenter who either attended to them (look toward condition) or looked away (look away condition). Seven‐month‐old infants' looking toward the experimenter was significantly greater after the dog barking events compared to before regardless of experimental condition. In contrast, 10‐month‐old infants' looks were significantly greater after the barking events compared to before only when the experimenter was attending to them. These results suggest that by 10 months infants monitor and refer to people in an ambiguous situation depending on their attention toward them. This development is viewed as indexing the emergence of an intentional stance in social referencing by 10 months of age.     

Automatic and location-adaptive estimation in functional single-index regression

This paper develops a new automatic and location-adaptive procedure for estimating regression in a Functional Single-Index Model (FSIM). This procedure is based on k-Nearest Neighbours (kNN) ideas. The asymptotic study includes results for automatically data-driven selected number of neighbours, making the procedure directly usable in practice. The local feature of the kNN approach insures higher predictive power compared with usual kernel estimates, as illustrated in some finite sample analysis. As by-product, we state as preliminary tools some new uniform asymptotic results for kernel estimates in the FSIM model.     

Axiomatization and implementation of a class of solidarity values for TU-games

A new class of values combining marginalistic and egalitarian principles is introduced for cooperative TU-games. It includes some modes of solidarity among the players by taking the collective contribution of some coalitions to the grand coalition into account. Relationships with other class of values such as the Egalitarian Shapley values and the Procedural values are discussed. We propose a strategic implementation of our class of values in subgame perfect Nash equilibrium. Two axiomatic characterizations are provided: one of the whole class of values, and one of each of its extreme points.     

Introduction to the Special Collection

In this essay, the authors argue that although “South” and “North” are more and more becoming problematic categories in the social sciences, in general, and in migration studies, in particular, it still makes sense today to focus on South‐South migrations. Not only because of its mere quantitative importance, but for a number of reasons. Firstly, new South‐South migration patterns are observable and new data are becoming available. Secondly, South‐South migrations still have a number of distinct features, including: the role of borders, the composition of migration flows, the migration‐conflict nexus, regional migration governance, and the specific relationships with certain migration‐related concepts and variables.     

From armed group to movement: armed struggle and movement formation in Northern Ireland and the Basque Country

In recent decades, social movement scholars have expanded our understanding of ‘terrorism’ by analyzing a particular trajectory, movement to armed group, whereby movement demobilization spurs armed struggle. This article analyzes an alternative trajectory: armed group to movement. Once armed struggle’s limitations become apparent, armed groups often adopt an attritional military strategy suited to their capacities. To securely wage an attritional campaign, groups disembed through the adoption of insular structures, removing them from their milieux and from recruits and resources needed for organizational reproduction. To offset this, armed groups reembed through the development of politico-military movement structures: forming allied aboveground movement organizations; coordinating armed and unarmed activism; and creating a ‘movement’ identity. This offsets disembedding in three ways. First, collective action augments armed groups’ violence by expanding the struggle into new domains. Second, mobilized support provides armed groups political legitimacy, countering the ‘terrorist’ label. Third, aboveground movement organizations assist in recruitment, alliance-formation, public communication, and mobilization, facilitating armed groups’ organizational reproduction. This paper investigates the strategic decision to adopt movement structures by analyzing documents produced by militants linked to the IRA and to rival ETAs, ETA Politico-Military and ETA Military, allowing for the exploration of different aspects of the decision to adopt movement structures. From Irish republican texts, insights into the basic benefits of movement development are gleaned. Basque separatist documents, on the other hand, provide perspectives on the nature of interorganizational centralization and coordination within politico-military movements.     

The dynamics of capital accumulation in the US: simulations after piketty

We develop a dynamic model where a competitive firm uses labor and capital, with market clearing rates of return. Individuals are heterogeneous in skills, with an endowment in capital/wealth increasing in skill. Individuals aspire to a socially determined consumption level, with a constant marginal propensity to consume out of income above this level. We also study three variants of the model: one with a higher rate of return for large capitals than for smaller ones, one with a capital levy financing a lump sum transfer, and one with social mobility. We calibrate the model to the US economy and obtain that a steady state exists in all variants, and we obtain convergence to the steady state from the 2012 US wealth distribution. The reduction in the level of the aspirational consumption level is the only way to create wealth for the bottom half of the distribution.     

ON THE USE OF VERBAL PROTOCOLS IN CONJOINT ANALYSIS STUDIES

A recent study by Olshavsky and Acito helped gain insight into (a) the decision process used by respondents when asked to do a conjoint task, (b) the predictive validity of conjoint models compared to models derived from verbal protocols, and (c) the reasons for prediction errors. In this article, the author argues that the Olshavsky and Acito results do not lead one to believe that the compensatory conjoint models can be potentially more misleading than models that try to represent more accurately the underlying evaluation process with noncompensatory and compensatory rules. Hence, it does not seem necessary to try to identify noncompensatory rules in a conjoint study.     

On the dynamic measurement of economic openness

The empirical relationship between economic openness and economic performance is much debated in the economic literature. No definitive conclusions seem to be reached yet, part of the problem being the very measurement of economic openness of a national economy. In their article in the Journal of Policy Modeling, Ruíz Estrada & Yap (2006) propose a new method to measure economic openness and to empirically assess the openness–growth nexus as a new tool for policy-makers: the Openness Growth Monitoring Model (OGM-Model). The authors claim: (i) that their method is different from and more flexible than existing empirical methods, (ii) that higher levels of openness do not lead to income growth, and (iii) that customs unions perform better than free trade areas. This short article challenges the three claims of the authors.