Quantifying simulator discrepancy in discrete-time dynamical simulators

When making predictions with complex simulators it can be important to quantify the various sources of uncertainty. Errors in the structural specification of the simulator, for example due to missing processes or incorrect mathematical specification, can be a major source of uncertainty, but are often ignored. We introduce a methodology for inferring the discrepancy between the simulator and the system in discrete-time dynamical simulators. We assume a structural form for the discrepancy function, and show how to infer the maximum-likelihood parameter estimates using a particle filter embedded within a Monte Carlo expectation maximization (MCEM) algorithm. We illustrate the method on a conceptual rainfall-runoff simulator (logSPM) used to model the Abercrombie catchment in Australia. We assess the simulator and discrepancy model on the basis of their predictive performance using proper scoring rules. This article has supplementary material online. © 2011 International Biometric Society.

A comparison of sales response predictions from demand models applied to store-level versus panel data

In order to generate sales promotion response predictions, marketing analysts estimate demand models using either disaggregated (consumer-level) or aggregated (store-level) scanner data. Comparison of predictions from these demand models is complicated by the fact that models may accommodate different forms of consumer heterogeneity depending on the level of data aggregation. This study shows via simulation that demand models with various heterogeneity specifications do not produce more accurate sales response predictions than a homogeneous demand model applied to store-level data, with one major exception: a random coefficients model designed to capture within-store heterogeneity using store-level data produced significantly more accurate sales response predictions (as well as better fit) compared to other model specifications. An empirical application to the paper towel product category adds additional insights. This article has supplementary material online.

Online digital special collections in English universities: promoting awareness

Cultural institutions in the UK are repositories of a wealth of historical material. The scholarly importance of such resources is at the basis of the numerous digitisation projects aimed at widening their access worldwide. The lack of national policies has left those institutions alone in engaging in dissemination activities and in raising awareness of their own online material. Of particular interest to the author are the digital special collections hosted in the English Universities. The main activities of these institutions differ from others, such as museums, archives and public libraries, as they do not have the main institutional duties of preserving and the exploiting of their holdings. This article highlights related issues and suggests some of the possible measures to effectively promote and disseminate universities’ online digital special collections.

Online digital special collections in English universities: promoting awareness

Cultural institutions in the UK are repositories of a wealth of historical material. The scholarly importance of such resources is at the basis of the numerous digitisation projects aimed at widening their access worldwide. The lack of national policies has left those institutions alone in engaging in dissemination activities and in raising awareness of their own online material. Of particular interest to the author are the digital special collections hosted in the English Universities. The main activities of these institutions differ from others, such as museums, archives and public libraries, as they do not have the main institutional duties of preserving and the exploiting of their holdings. This article highlights related issues and suggests some of the possible measures to effectively promote and disseminate universities’ online digital special collections.

Introduction : special issues on key debates in advertising material

Research on advertising has been conducted mainly from within disciplines such as marketing and reception studies. Within translation studies, research has focused more on comparative analysis of language pairs for intersystemic differences, and more recently on intercultural differences in product appeal and cultural values. Advertising as text type was most comprehensively used and developed within Western cultures, then 'exported' to other cultures. Initially the assumption was that the message could be translated and the product would sell on the basis of Western value-based market research, although this is now clearly shown not to be the case, as contributors to this volume all demonstrate through empirical studies. The introduction to this volume offers a comprehensive survey of work done in the field, both within and outside translation studies, outlines the use of semiotics as a suitable framework for research, and summarizes the key issues relating to the global vs. local debate.

Special issue:key debates in the translation of advertising material

Much has been written about the marketing aspects of promotional material in general, and several scholars (particularly in linguistics) have addressed questions relating to the structure and function of advertisements, focusing on images, rhetorical structure, semiotic functions, discourse features and audio-visual media, amongst other aspects of the genre. Not much, on the other hand, has been written within translation studies about the complexities involved in the transfer of an advertising message. Contributors to this volume explore various interdependent aspects of the interlingual and intercultural transfer of an advertising message. They emphasize features of culture specificity, of multi-medial semiotic interaction, of values and stereotypes, and most importantly, they recommend strategies and approaches to assist translators. Topics covered include a critique of the Western-based approach to advertising in the context of the Far East; different perceptions of the concept of cleanliness in advertising texts in Italy, Russia and the UK; the Walls Cornetto strategy of internationalization of product appeal, followed by localization; the role of the translator in recreating appeal in different lingua-cultural contexts; what constitutes 'Italianness' in advertisements for British consumers; and strategies for repackaging France as a tourist destination.