Erratum

In our article entitled "The Social Bases of Environmental Concern:A Review of Hypotheses, Explanations and Empirical Evidence"(POQ 44:181–97), two rows of correlations were reversedin Table 1. Under the study by Van Liere and Dunlap, 1978, figuresfor the environmental funding scale appear where figures forthe environmental regulations scale should be, and vice versa.We regret the error and hope it has not caused undue confusionfor anyone using these data.     

The multiplicity of citizenship: transnational and local practices and identifications of middle‐class migrants

In this article we focus on local and transnational forms of active citizenship, understood as the sum of all political practices and processes of identification. Our study, conducted among middle‐class immigrants in Rotterdam, the Netherlands, indicates that the importance of active transnational citizenship should not be overstated. Among these immigrants, political practices are primarily focused on the local level; political practices directed to the home country appear to be quite rare. However, although transnational activities in the public sphere are rather exceptional, many immigrants do participate in homeland‐directed activities in the private sphere. If we look at processes of identification, we see that a majority of the middle‐class immigrants have a strong local identity. Many of them combine this local identification with feelings of belonging to people in their home country.     

SIMULATION EXPLORATION OF THE POWER OF MARGINAL REGRESSION ANALYSIS*

In either simple or multivariate regression models, measured coefficients represent a kind of average of co-variant relationships implicit in the data. For time-series data, if co-variant relationships follow no particular pattern over the sample period, use of this average in forecasting is rational. However, if relationships among independent and dependent variables is undergoing change over time, then measured regression coefficients are likely to be poor tools for prediction. This paper is an exploratory study of this general problem area. It develops implications as to the predictive impact of the problem and offers preliminary suggestions as to a method of developing predictions under such circumstances.     

Disagreement Loop and Path Creation/Annihilation Algorithms for Binary Planar Markov Fields with Applications to Image Segmentation

Abstract. We introduce a class of Gibbs–Markov random fields built on regular tessellations that can be understood as discrete counterparts of Arak–Surgailis polygonal fields. We focus first on consistent polygonal fields, for which we show consistency, Markovianity and solvability by means of dynamic representations. Next, we develop disagreement loop as well as path creation and annihilation dynamics for their general Gibbsian modifications, which cover most lattice‐based Gibbs–Markov random fields subject to certain mild conditions. Applications to foreground–background image segmentation problems are discussed.     

Reactive transnationalism: homeland involvement in the face of discrimination

In this article we examine whether migrants' perceived discrimination in the country of settlement leads to an increase of their transnational involvement. So far, this so‐called ‘reactive transnationalism’ has not been studied extensively. Based on literature on discrimination and transnationalism, reactive transnationalism is expected to be most prominent among socioeconomically successful migrants, particularly among males and those who consider themselves Muslims. Our research among middle‐class migrants in Rotterdam, the Netherlands, indeed shows that the more respondents experienced discrimination, the more transnationally involved they are, both regarding transnational identifications and transnational activities. While no gender difference was found regarding reactive transnational activities, for women perceived discrimination proves to lead to stronger instead of weaker transnational identifications than for men. The fact that no difference was found between Muslim and non‐Muslim respondents regarding reactive transnationalism suggests that, despite heated public debates about ‘Islam’, in the Netherlands, ethnic divides – being considered as ‘Dutch’ or ‘non‐Dutch’ – are even more prominent than religious ones.     

Asymptotic Normality of Kernel-Type Deconvolution Estimators

Abstract.  We derive asymptotic normality of kernel-type deconvolution estimators of the density, the distribution function at a fixed point, and of the probability of an interval. We consider so-called super smooth deconvolution problems where the characteristic function of the known distribution decreases exponentially, but faster than that of the Cauchy distribution. It turns out that the limit behaviour of the pointwise estimators of the density and distribution function is relatively straightforward, while the asymptotic behaviour of the estimator of the probability of an interval depends in a complicated way on the sequence of bandwidths.     

Estimation for High‐Dimensional Linear Mixed‐Effects Models Using ℓ1‐Penalization

Abstract. We propose an ?₁‐penalized estimation procedure for high‐dimensional linear mixed‐effects models. The models are useful whenever there is a grouping structure among high‐dimensional observations, that is, for clustered data. We prove a consistency and an oracle optimality result and we develop an algorithm with provable numerical convergence. Furthermore, we demonstrate the performance of the method on simulated and a real high‐dimensional data set.