Is Evaluating Visual Search Interfaces in Digital Libraries Still an Issue?

Although various visual interfaces for digital libraries have been developed in prototypical systems, very few of these visual approaches have been integrated into today's digital libraries. In this position paper we argue that this is most likely due to the fact that the evaluation results of most visual systems lack comparability. There is no fix standard on how to evaluate visual interactive user interfaces. Therefore it is not possible to identify which approach is more suitable for a certain context. We feel that the comparability of evaluation results could be improved by building a common evaluation setup consisting of a reference system, based on a standardized corpus with fixed tasks and a panel for possible participants.Comment: 10 pages, 2 figures, LWA Workshop 201

Assessing Visualization Techniques for the Search Process in Digital Libraries

In this paper we present an overview of several visualization techniques to support the search process in Digital Libraries (DLs). The search process typically can be separated into three major phases: query formulation and refinement, browsing through result lists and viewing and interacting with documents and their properties. We discuss a selection of popular visualization techniques that have been developed for the different phases to support the user during the search process. Along prototypes based on the different techniques we show how the approaches have been implemented. Although various visualizations have been developed in prototypical systems very few of these approaches have been adapted into today's DLs. We conclude that this is most likely due to the fact that most systems are not evaluated intensely in real-life scenarios with real information seekers and that results of the interesting visualization techniques are often not comparable. We can say that many of the assessed systems did not properly address the information need of cur-rent users.Comment: 23 pages, 14 figures, pre-print to appear in "Wissensorganisation mit digitalen Technologien" (deGruyter

Bayesian analysis of ARMA models using noninformative priors

Parameters in ARMA models are only locally identified. It is shown that the use of diffuse priors in these models leads to a preference for locally nonidentified parameter values. We therefore suggest to use likelihood based priors like the Jeffreys' priors which overcome these problems. An algorithm involving Importance Sampling for calculating the posteriors of ARMA parameters using Jeffreys' priors is constructed. This algorithm is based on the implied AR specification of ARMA models and shows good performance in our applications. As a byproduct the algorithm allows for the computation of the posteriors of diagnostic parameters which show the identifiability of the MA parameters. As a general to specific modeling approach to ARMA models suffers heavily from the previous mentioned identification problems, we derive posterior odds ratios which are suited for comparing (nonnested) parsimonious (low order) ARMA models. These procedures are applied to two datasets, the (extended) Nelson-Plosser data and monthly observations of US 3-month and 10 year interest rates. For approximately 50% of the series in these two datasets an ARMA model is favored above an AR model which has important consequences for especially the long run parametersARMA Models;econometrics

Qualitative analysis of young adult ENDS users' expectations and experiences.

ObjectivesDespite extensive research into the determinants of electronic nicotine delivery system (ENDS) uptake, few studies have examined the psychosocial benefits ENDS users seek and experience. Using a consumer ritual framework, we explored how ENDS users recreated or replaced smoking practices, and considered implications for smoking cessation.DesignIn-depth interviews; data analysed using thematic analysis.SettingDunedin, New Zealand.Participants16 young adult ENDS users (age M=21.4, SD=1.9; 44% female).ResultsParticipants reported using different ENDS to achieve varying outcomes. Some used 'cigalikes' to recreate a physically and visually similar experience to smoking; they privileged device appearance over nicotine delivery. In contrast, others used personally crafted mods to develop new rituals that differentiated them from smokers and showcased their technical expertise. Irrespective of the device they used, several former smokers and dual users of cigarettes and ENDS experienced strong nostalgia for smoking attributes, particularly the elemental appeal of fire and the finiteness of a cigarette. Non-smoking participants used ENDS to maintain social connections with their peers.ConclusionsParticipants used ENDS to construct rituals that recreated or replaced smoking attributes, and that varied in the emphasis given to device appearance, nicotine delivery, and social performance. Identifying how ENDS users create new rituals and the components they privilege within these could help promote full transition from smoking to ENDS and identify those at greatest risk of dual use or relapse to cigarette smoking

Does the Dutch Model Really Exist?

The policy that has led from the ‘Dutch disease’ (in the 1980s) to the ‘Dutch miracle’ (in the 1990s) consists of three tracks: 1) wage moderation, 2) retrenching public expenditure and reducing the tax burden, 3) slimming the welfare system. The wage moderation track seems to have been the most important one. The term ‘Dutch model’ refers to the socioeconomic system of the Netherlands. Most observers point in particular to the relatively low unemployment rate to indicate the success of this model. However, the economic inactivity rate in the Netherlands is not lower than in neighboring countries. This suggests that open unemployment in the Netherlands has partly been replaced with hidden unemployment. In particular the disability scheme seems to contain a large component of hidden unemployment. Another feature of the Dutch model is its consensus seeking nature, which is fostered by its institutional structure.Dutch model, Dutch disease, Netherlands, polder model

Does the Dutch Model Really Exist?

The policy that has led from the ‘Dutch disease’ (in the 1980s) to the ‘Dutch miracle’ (in the 1990s) consists of three tracks: 1) wage moderation, 2) retrenching public expenditure and reducing the tax burden, 3) slimming the welfare system. The wage moderation track seems to have been the most important one. The term ‘Dutch model’ refers to the socioeconomic system of the Netherlands. Most observers point in particular to the relatively low unemployment rate to indicate the success of this model. However, the economic inactivity rate in the Netherlands is not lower than in neighboring countries. This suggests that open unemployment in the Netherlands has partly been replaced with hidden unemployment. In particular the disability scheme seems to contain a large component of hidden unemployment. Another feature of the Dutch model is its consensus seeking nature, which is fostered by its institutional structure.Dutch model, welfare system, Dutch disease, Dutch miracle