Using Cluster Analysis and ICP‐MS to Identify Groups of Ecstasy Tablets in Sao Paulo State,Brazil

The variations found in the elemental composition in ecstasy samples result in spectral profiles with useful information for data analysis, and cluster analysis of these profiles can help uncover different categories of the drug. We provide a cluster analysis of ecstasy tablets based on their elemental composition. Twenty‐five elements were determined by ICP‐MS in tablets apprehended by Sao Paulo's State Police, Brazil. We employ the K‐means clustering algorithm along with C4.5 decision tree to help us interpret the clustering results. We found a better number of two clusters within the data, which can refer to the approximated number of sources of the drug which supply the cities of seizures. The C4.5 model was capable of differentiating the ecstasy samples from the two clusters with high prediction accuracy using the leave‐one‐out cross‐validation. The model used only Nd, Ni, and Pb concentration values in the classification of the samples.     

Dyadic Representation in a Westminster System

Is policy representation in contemporary Westminster systems solely a function of programmatic national parties, or does the election of legislators via single‐member districts result in MPs whose policy positions are individually responsive to public opinion in their constituencies? We generate new measures of constituency opinion in Britain and show that, in three different policy domains and controlling for MP party, the observed legislative behavior of MPs is indeed responsive to constituency opinion. The level of responsiveness is moderate, but our results do suggest a constituency‐MP policy bond that operates in addition to the well‐known bond between voters and parties.     

Understanding and Measuring Consumption Motives in the Performing Arts

Currently, there is no common understanding of categorizing, conceptualizing, and measuring consumption motives in the performing arts. Study one presents the results of forty-seven semi-structured, in-depth interviews and deepens the understanding of consumption motives. A new framework consisting of cultural and social motives is introduced. This framework is tested in the second study. Here, a quantitative instrument is developed. The results of the principal components analysis refine the framework and demonstrate the following consumption motives: cultural aesthetics (with two dimensions: artistic value and enjoyment of beauty), cultural relaxation, cultural stimulation, social bonding, social attraction, social distinction, and social duty.     

Some stylised facts about cash and black economies in Germany

The currency approach assumes black economies to entail larger cash volumes than those needed for transactions in the official economy. Estimates of this hypothesis use e.g. overall cash data. But, for the case of Germany, the growing DM cash amounts in circulation did not only accompany transactions in the national economy, they also disseminated in hoards and in international uses. A series of adjusted cash figures is derived which shows the maximum dimension of national cash uses either for official or black activities. The adjusted cash figures in general grew less fast than overall cash, private consumption, GDP or M1 respectively. They even diminished relative to sales figures which often are accused of being a basis for black activities. This enhances the presumption that, contrary to some contentions in the literature, black activities during the times of the DM-regime played a minor or even decreasing role in Germany.     

Individual and contextual variation in EU issue voting: The role of political information

Increasing politicization in EU member states about European issues can be expected to strengthen the impact of attitudes towards Europe on vote choice in European Parliament (EP) elections. At the same time this impact is likely to vary between voters and contexts as a function of political information. This study explores the role of political information in explaining individual and contextual heterogeneity in the degree of EU issue voting. Using a two-step hierarchical estimation procedure to explore both individual and contextual variation, we show that while EU issue voting in the 2009 EP elections is only slightly more pronounced among the politically sophisticated, it is clearly more extensive in contexts that provide higher levels of political information on European matters.