Abstract
The gap in statistics between multi-variate and time-series analysis can be bridged by using entropy statistics and recent developments in multi-dimensional scaling. For explaining the evolution of the sciences as non-linear dynamics, the configurations among variables can be important in addition to the statistics of individual variables and trend lines. Animations enable us to combine multiple perspectives (based on configurations of variables) and to visualize path-dependencies in terms of trajectories and regimes. Path-dependent transitions and systems formation can be tested using entropy statistics.
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Notes
More recently, vector autoregression models are developed that capture linear interdependencies among a limited number of time series (Abdulnasser 2004).
Probabilistic entropy (H) is coupled to thermodynamic entropy (S) by Gibbs entropy formula: S = k B × H. In this formula, k B is the Boltzmann constant with dimensionality Joule/Kelvin. H is dimensionless and, for example, expressed in bits of information. Because of the second law both S and H necessarily increase or, in other words, the change in information (uncertainty) is always positive.
The stand-alone program VOSViewer uses the approach of MDS, but the current version does not provide stress values (Van Eck and Waltman 2010).
The dynamic version of Visone is freely available at http://www.leydesdorff.net/visone.
A different class of models is provided by actor-based models for network dynamics (e.g., Snijders et al. 2010).
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Leydesdorff, L. Statistics for the dynamic analysis of scientometric data: the evolution of the sciences in terms of trajectories and regimes. Scientometrics 96, 731–741 (2013). https://doi.org/10.1007/s11192-012-0917-0
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DOI: https://doi.org/10.1007/s11192-012-0917-0