Prediction of Bike-sharing Trip Counts: Comparing Parametric Spatial Regression Models to a Geographically Weighted XGBoost Algorithm

Regression models are commonly applied in the analysis of transportation data. This research aims at broadening the range of methods used for this task by modeling the spatial distribution of bike-sharing trips in Cologne, Germany, applying both parametric regression models and a modified machine learning approach while incorporating measures to account for spatial autocorrelation. Independent variables included in the models consist of land use types, elements of the transport system and sociodemographic characteristics. Out of several regression models with different underlying distributions, a Tweedie generalized additive model is chosen by its values for AIC, RMSE, and sMAPE to be compared to an XGBoost model. To consider spatial relationships, spatial splines are included in the Tweedie model, while the estimations of the XGBoost model are modified using a geographically weighted regression. Both methods entail certain advantages: while XGBoost leads to far better values regarding RMSE and sMAPE and therefore to a better model fit, the Tweedie model allows an easier interpretation of the influence of the independent variables including spatial effects.     

Varieties of nationalism in the political discourses of Habsburg Austria

Nationalism in the Habsburg Empire is traditionally viewed through an ethnic lens. Despite a growing literature on ‘national indifference’ that studies nationalism in Habsburg central Europe from a constructivist perspective and advances our knowledge concerning variations in national identifications, the nationalism implied in these works remains largely limited to an exclusionary ethnic type. This reductionist view of central European nationalism mirrors the traditional dichotomy of ethnic ‘Eastern’ versus civic ‘Western’ nationalism. In order to avoid this reduction, this article approaches nationalism as a thin-centred ideology and explores varieties of nationalism in Habsburg Austria during the long 19th century. Although certain ideational paths made ethno-nationalism appear, retrospectively, as a quasi-natural feature of central Europe, the findings show that there developed rival discursive traditions of nationalism and competing representations of nation.     

Was kann und sollte die Geographie für die Entwicklungszusammenarbeit leisten?

Zwar sind Untersuchungen in den so genannten Entwicklungsländern mit human- oder naturgeographischem Fokus klassischer Gegenstand der Geographie, jedoch ist es dem Fach im Vergleich mit anderen Disziplinen bisher nicht in ausreichendem Maße gelungen, sich als ernst genommener Partner der praktischen Entwicklungszusammenarbeit zu etablieren. Allerdings hat sich in jüngeren Jahren das inhaltliche und methodische Spektrum der modernen geographischen Entwicklungsforschung erheblich erweitert, ebenso haben sich Selbstverständnis und Aufgabenfelder der Entwicklungszusammenarbeit verändert. Darin liegt die Chance, im Dialog zwischen Wissenschaft und Praxis den Beitrag der Geographie zur Entwicklungszusammenarbeit zu stärken. Die nachfolgenden Ausführungen setzen sich einerseits zum Ziel, thesenartig die Felder aufzuzeigen, die aus Sicht des Fachwissenschaftlers entsprechende Anknüpfungsmöglichkeiten und inhaltlichmethodische Potentiale bieten. Andererseits sollen die Bereiche in Forschung und Lehre angesprochen werden, in denen nach wie vor Handlungsbedarf im Dialog zwischen Wissenschaft und Praxis gesehen wird.     

Supplier linkages of foreign-owned manufacturing firms in the UK: the influence of entry mode,subsidiary autonomy and nationality

This article tests the hypothesis that the supplier linkages which subsidiaries of foreign-owned companies make with indigenous firms in the UK are influenced by entry mode, the amount of autonomy which is granted to the subsidiary which is established and the nationality of the parent company. Data were collected from foreign-owned firms in the UK and an ordered probit model with the change in supplier linkages as the dependent variable was devised and tested. The results provide support for the hypothesis in terms of entry mode and subsidiary autonomy, but not in terms of parent nationality. This study represents a new approach to the study of supplier linkages and integrates concepts and studies from both regional science and international business. Foreign-owned firms which entered the UK by means of a greenfield entry tend to have a relatively positive effect on the creation and growth of supplier linkages, whereas those which entered by way of a merger or acquisition tended to have a relatively negative effect on the growth of such linkages. This finding has important implications for academics and policy-makers alike. Although the potential impact which the creation of supplier linkages can make upon the host country's economy has long been recognised, little research has been undertaken to identify the key factors which affect such growth. With increased levels of globalisation it is important that governments are able to maximise the impact which foreign direct investment makes upon the economy of their countries.     

Urban development,redevelopment and regeneration encouraged by transport infrastructure projects: The case study of 12 European cities

This paper attempts to describe the potential of urban transport infrastructure projects such as metro, regional rail and tram, to indirectly work as a catalyst for the development and redevelopment of urban areas as well as the regeneration of declining areas. The paper presents the outcome of research on a sample of 12 European cities—Athens, Bratislava, Brussels, Helsinki, Lyon, Madrid, Manchester, Newcastle upon Tyne, Stuttgart, Valencia, Vienna and Zurich. This research is part of the Transecon project which was funded by the European Commission under the competitive and sustainable growth programme of the fifth framework— and concerned with all kinds of different indirect effects (economic, social and spatial) of new transport infrastructure investments in European cities. The outcome of the research points out that urban transport infrastructure may have a catalytic effect on the development, redevelopment and regeneration of urban areas but there are a lot of other influencing factors which make such re-urbanization processes a successful or unsuccessful story.     

Possibilism: An Approach to Problem‐Solving Derived from the Life and Work of Albert O. Hirschman

Albert O. Hirschman is the author of seminal, but prima facie unconnected contributions to the social sciences (‘exit–voice’, ‘linkages’). Yet, his main originality lies in his general approach to problem‐solving which is hidden behind the complexity of his oeuvre. This article intends to disentangle the intricacies of his work and to reveal his specific mode of investigation by making the multifaceted biographical influences on Hirschman's scholarly writings visible. Exhibiting the influence that decisive moments in his life had on his work not only allows us to identify and define his method of ‘possibilism’: it also shows that this approach remains a valid and useful multidisciplinary tool for unorthodox contemporary social analysis.     

Revitalisierung und Entwicklung von Brachen

Als Entscheidungshilfe für die Revitalisierung und Wiederverwertung von Industriebrachen wurde ein flexibler, multimedialer Leitfaden entwickelt, der die Revitalisierungsprozesse strukturiert darstellt sowie unterschiedliche Anforderungen und fachspezifische Methoden integriert.