Loet Leydesdorff

University of Amsterdam, Amsterdam School of Communication Research (ASCoR)

http://www.leydesdorff.net

Standards for Science Metrics, Classifications, and Mapping

Scientific enterprise;

scholars; institutions

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Socio-cognitive horizons

input; steering

Three dynamics:

1. Changes in socio-political regimes (national? European?);

2. Changes in socio-cognitive regimes (at the global level?);

3. Changes in institutional arrangments (locally).

OECD; NSB

The dynamics of journals

Evaluation; citation analysis

Standards for journal maps2009

Figure 4: 8,860 journals similar in their citing patterns above cosine > 0.2; 19 clusters (γ = 1) using the algorithm built into VOSViewer (Van Eck et al., 2010).

Figure 7: Distribution of cities in North-Western Europe above or below expectations in terms of integrated impact on the basis of 15 core journals. The sizes of the nodes are proportional to the logarithm of the number of papers; colors: red indicates below expectation; green above. The Google Map is available at http://www.leydesdorff.net/nano2011/nano2011.htm.

i ii xfxI )(*3

Integrated Impact Indicator

+ fractional counting of citationsfor field normalization

Conclusions

• From descriptive statistics to significance testing;

• Use nonparametric statistics for skewed citation distributions;

• Integrated Impact Indicator (I3); Rao-Stirling Diversity measure for interdisciplinarity;

• Test observed against expected!