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Currents and Sub-currents in the River of Innovations - Explaining Innovativeness using New-Product Announcements

Dolfsma, Wilfred; van der Panne, G. - Erasmus Research Institute of Management (ERIM), … - 2006

In their seminal paper, Acs and Audretsch (1988) analyze innovation patterns across industries and identify several … innovation; industries characterized by increased shares of skilled labor and large firms provide favorable conditions for … innovation. By analyzing a new and more consciously compiled database, we re-examine their original claims. Our results largely …

Persistent link: https://www.econbiz.de/10010731228

Appropriability in Services

Dolfsma, Wilfred - Erasmus Research Institute of Management (ERIM), … - 2005

paper I take a closer look at one aspect of innovation in services: appropriability. I discuss the different elements that …

Persistent link: https://www.econbiz.de/10010837550

The Process of New Service Development: issues of formilization and appropriability

Dolfsma, Wilfred - Erasmus Research Institute of Management (ERIM), … - 2004

Services form an important part of the economy today. Innovation for service firms is as important as for manufacturing …, but the innovation process for service firms is comparatively little studied. In this paper, I review the literature there … is on the innovation process for service firms, and make two suggestions for formalizing that process. The common thought …

Persistent link: https://www.econbiz.de/10010731080

VOS: A New Method for Visualizing Similarities between Objects

van Eck, van Eck, N.J.P.; Waltman, Waltman, L. - Erasmus Research Institute of Management (ERIM), … - 2006

We present a new method for visualizing similarities between objects. The method is called VOS, which is an abbreviation for visualization of similarities. The aim of VOS is to provide a low-dimensional visualization in which objects are located in such a way that the distance between any pair...

Persistent link: https://www.econbiz.de/10010730862

Some Comments on the Question Whether Co-Occurrence Data Should Be Normalized

Waltman, Waltman, L.; van Eck, van Eck, N.J.P. - Erasmus Research Institute of Management (ERIM), … - 2008

In a recent article in JASIST, L. Leydesdorff and L. Vaughan (2006) asserted that raw cocitation data should be analyzed directly, without first applying a normalization such as the Pearson correlation. In this communication, it is argued that there is nothing wrong with the widely adopted...

Persistent link: https://www.econbiz.de/10010730955

Generalizing the h- and g-indices

van Eck, van Eck, N.J.P.; Waltman, Waltman, L. - Erasmus Research Institute of Management (ERIM), … - 2008

We introduce two new measures of the performance of a scientist. One measure, referred to as the hα-index, generalizes the well-known h-index or Hirsch index. The other measure, referred to as the gα-index, generalizes the closely related g-index. We analyze theoretically the relationship...

Persistent link: https://www.econbiz.de/10010731216

Bibliometric Mapping of the Computational Intelligence Field

van Eck, van Eck, N.J.P.; Waltman, Waltman, L. - Erasmus Research Institute of Management (ERIM), … - 2008

In this paper, a bibliometric study of the computational intelligence field is presented. Bibliometric maps showing the associations between the main concepts in the field are provided for the periods 1996–2000 and 2001–2005. Both the current structure of the field and the evolution of the...

Persistent link: https://www.econbiz.de/10010731283

How to Normalize Co-Occurrence Data? An Analysis of Some Well-Known Similarity Measures

van Eck, van Eck, N.J.P.; Waltman, Waltman, L. - Erasmus Research Institute of Management (ERIM), … - 2009

In scientometric research, the use of co-occurrence data is very common. In many cases, a similarity measure is employed to normalize the data. However, there is no consensus among researchers on which similarity measure is most appropriate for normalization purposes. In this paper, we...

Persistent link: https://www.econbiz.de/10010731291

Some Comments on Egghe’s Derivation of the Impact Factor Distribution

Waltman, Waltman, L.; van Eck, van Eck, N.J.P. - Erasmus Research Institute of Management (ERIM), … - 2009

In a recent paper, Egghe [Egghe, L. (in press). Mathematical derivation of the impact factor distribution. Journal of Informetrics] provides a mathematical analysis of the rank-order distribution of journal impact factors. We point out that Egghe’s analysis relies on an unrealistic assumption,...

Persistent link: https://www.econbiz.de/10010731304

Economic Modeling Using Evolutionary Algorithms: The Effect of a Binary Encoding of Strategies

Dekker, Rommert; Kaymak, Uzay; Waltman, Waltman, L.; … - Erasmus Research Institute of Management (ERIM), … - 2009

We are concerned with evolutionary algorithms that are employed for economic modeling purposes. We focus in particular on evolutionary algorithms that use a binary encoding of strategies. These algorithms, commonly referred to as genetic algorithms, are popular in agent-based computational...

Persistent link: https://www.econbiz.de/10010731317