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- Roland Wagner-Döbler
- Scientometrics
- 2001

Time-series of collaboration trends indicated through co-authorships are examined from 1800 to presence in mathematics, logic, and physics. In physics, the share of co-authored papers expands in the second half of the19th century, in mathematics in the first decades of the 20th century, in logic in the second half of the 20th century. Subdisciplines of… (More)

- Jan Berg, Roland Wagner-Döbler
- Scientometrics
- 1996

Sequences of empirical Lotka-like distributions of the publications of scientific areas are mapped into a multidimensional parameter space. On this basis a new definition of the notion of an epidemic phase of a discipline is introduced. A graphic representation of the parameter space along with results of an exponential regression analysis of the Lotka… (More)

- Frank Havemann, Michael Heinz, Roland Wagner-Döbler
- Scientometrics
- 2004

According to authors like H. E. Stanley and others, growth dynamics of university research displays a quantitative behaviour similar to the growth dynamics of firms acting under competitive pressure. Features of such behaviour are probability distributions of annual growth rates or the standard deviation of growth rates. We show that a similar statistical… (More)

- Roland Wagner-Döbler
- Scientometrics
- 1995

Frequency distributions of scientific productivity are usually based on cross section cuts of the investigated population of scientists. Therefore, some of the registered scientists are involved for the whole period of time, but there are many fractional authors, too. If one compares only scientists active in a specialty for the same length of time, the… (More)

- John C. Huber, Roland Wagner-Döbler
- Scientometrics
- 2001

We show that scientific production can be described by two variables: rate of production (rate of publications) and career duration. For mathematical logicians, we show that the time pattern of production is random and Poisson distributed, contrary to the theory of cumulative advantage. We show that the exponential distribution provides excellent… (More)

- Roland Wagner-Döbler
- Scientometrics
- 2005

This paper discusses the Thomson ISI Research Services Group approaches to analyzing the world research environment, particularly in terms of comparing research performance among nations and institutions. This discussion concentrates on the recent research environment - 1998-2002 - beginning first with comparisons among selected nations overall, in terms of… (More)

- John C. Huber, Roland Wagner-Döbler
- Scientometrics
- 2001

We show that scientific production can be described by two variables: rate of production (rateof publications) and career duration. For 19th century physicists, we show that the time pattern ofproduction is random and Poisson distributed, contrary to the theory of cumulative advantage. Weshow that the exponential distribution provides excellent… (More)

- Roland Wagner-Döbler
- Scientometrics
- 1998

In times of economic stagnation, the debate about “long waves” of economic growth typically refreshes. This has also been the case in the period of the world-wide economic stagnation since 1970. But the results concerning the existence of long-term cycles of economic activity are still controversial. In this contribution, the “ups and downs in the pulse of… (More)

- Liming Liang, Frank Havemann, Michael Heinz, Roland Wagner-Döbler
- Scientometrics
- 2006

To compare science growth of different countries is both, of theoretical and of pragmatic interest. Using methods for the analysis of complex growth processes introduced by H. E. Stanley and others, we exhibit quantitative features of Chinese science growth from 1986 to 1999 and compare them with corresponding features of western countries. Patterns of… (More)

- Roland Wagner-Döbler, Jan Berg
- Journal of Documentation
- 1995