[Sigmetrics] Statistical Significance and Effect Sizes of Differences among Research Universities; preprint

Loet Leydesdorff loet at leydesdorff.net
Tue Oct 31 03:22:33 EDT 2017

Statistical Significance and Effect Sizes of Differences among Research 
Universities at the Level of Nations and Worldwide based on the Leiden 
Rankings <https://arxiv.org/abs/1710.11020>

Loet Leydesdorff, Lutz Bornmann, John Mingers
>One can use the Leiden Rankings for grouping research universities by 
>considering universities which are not significantly different as a 
>homogeneous set. Such groupings reduce the complexity of the rankings 
>without losing information. We pursue this classification using both 
>statistical significance and effect sizes of differences among 902 
>universities in 54 countries, we focus on the UK, Germany, and Brazil 
>as national examples. Although the groupings remain largely the same 
>using different statistical significance levels, the resulting 
>classifications are uncorrelated with the ones based on effect sizes 
>(Cramer's V < .3). Effect sizes for the differences between 
>universities are small (w <.2). The results based on 
>statistical-significance testing can be understood intuitively. 
>However, the results based on effect sizes suggest a division between a 
>North-Atlantic and an Asian-Pacific group. The more detailed analysis 
>of universities at the country level suggests that distinctions between 
>more than three groups of universities (high, middle, low) are not 
Preprint at https://arxiv.org/abs/1710.11020
** apologies for cross-postings

Loet Leydesdorff

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

loet at leydesdorff.net <mailto:loet at leydesdorff.net>; 
Associate Faculty, SPRU, <http://www.sussex.ac.uk/spru/>University of 

Guest Professor Zhejiang Univ. <http://www.zju.edu.cn/english/>, 
Hangzhou; Visiting Professor, ISTIC, 

Visiting Fellow, Birkbeck <http://www.bbk.ac.uk/>, University of London;


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