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Comparing performance of feed-forward neural nets and k-means for cluster-based market segmentation

We compare the performance of a specifically designed feedforward artificial neural network with one layer of hidden units to the K-means clustering technique in solving the problem of cluster-based market segmentation. The data set analyzed consists of usages of brands (product category: household cleaners) in different usage situations. The proposed feedforward neural network model...

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English / 01/01/1999

Gli effetti della democrazia diretta sul processo politico svizzero

The authors investigate the impact of direct democracy on aspects of the political process in Switzerland. They dwell in particular on the concrete use of the instruments of direct democracy by organized groups of citizens, and on the effects of this use on collective protest movements (or social movements) at the local level. The essay divides into three parts. The first briefly...

Institution partenaire

Université de Genève

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Italiano / 01/01/1999

Under The Spotlight: The Impact of Media Attention on Protest Policing

Explanations of protest policing have neglected the "spotlight of the media." Based on data on repression and its media coverage in four Swiss cities from 1965 to 1994, our findings suggest that the mass media do have an impact on levels and forms of repression, along with political opportunity dimensions and levels of disruption. We identify two mechanisms. First, we show...

Institution partenaire

Université de Genève

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English / 01/01/1999

Statistical Inference for Welfare under Complete and Incomplete Information

We show how a collection of results in the literature on the empirical estimation of welfare indicators from sample data can be unified. We also demonstrate how some of these ideas can be extended to empirically important cases where the data have been trimmed or censored.

Institution partenaire

Université de Genève

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English / 01/01/1999

Alternative GMM Methods for Nonlinear Panel Data Models

Not available in German. Frühere Version: Breitung, J. and M. Lechner (1998), Altenative GMM Methods for Nonlinear Panel Data models, discussion paper 81, SFB 373 Humbold-Universität zu Berlin. Download Volltext: (pdf, 263 kb)

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English / 01/01/1999

Earnings and Employment Effects of Continuous Off-the-job Training in East Germany after Unification

Not available in German. Retraining the labor force to match the demands of a modern economy is an important task during the transition process from a centrally planned to a market economy. This need is particular pressing in East Germany, because the transition process is much faster there than in the rest of Eastern Europe. Therefore, substantial resources are devoted to this...

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English / 01/01/1999

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