1. EERQI Final Conference, Brussels, 15-16 March 2011 This project is funded by the Socioeconomic Sciences and Humanities Section. Interrelations Of Indicators Work in Progress Prof. Dr. Stefan Gradmann / Dr. Frank Havemann Humboldt-Universität zu Berlin / Berlin School of Library and Information Science (IBI)

2. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 2 Overview Base Data Intrinsic Indicators: Interrelation Extrinsic paper data from search engines and social-network services Citations in Google Scholar Correlation of intrinsic total score with extrinsic scores

3. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 3 Base Data Assessments of 179 papers based on intrinsic criteria two files of extrinsic data: –citation numbers of rated papers obtained with Google Scholar (on March 8, 2011) –data from search engines and social-network services. extrinsic author data suffer from homonymic authors → we only use paper attributes. Papers in English and in German distributed over three thematic groups: –Group 1 includes papers about "assessment, evaluation, testing & measurement" (35 / 35) –group 2 about "comparative and inter-/multicultural education" (33 / 17) –group 3 about "history and philosophy of education" (34 / 17)

4. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 4 Intrinsic Indicators: Interrelation Rigour ratings –average of nine ratings of different aspects Originality ratings –average of three ratings of different aspects Significance ratings –average of four ratings of different aspects Combined rating score for each paper: the average ratings of all 16 aspects (total score on a scale from 0 to- 7). To do: weight the mean ratings of each paper with its number of ratings (→ we need all individual ratings by different persons that until now have not available). The scatterplots in the three figures of mean scores of rigour, originality, and significance show that the latter two correlate best, especially for English-language papers.

5. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 5 Originality – Rigour Interrelation → Lowest Correlation Strength

6. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 6 Rigour - Significance Interrelation → Medium-low Correlation Strength

7. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 7 Originality – Significance Interrelation → Maximum Correlation Strength

8. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 8 Intrinsic Indicators: Distributions of Total Scores Box-and-whisker plots of distributions of total scores per language and group can be compared in the figures We display only distributions of rated papers which also have data from search engines or social-network services. –The box in each plot contains 50 % of papers around the median (black horizontal line). –The range of ratings are visualised by the "whiskers". –Lonely points show outliers (which are more distant from the box than 1.5 times the box's height).

9. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 9 Intrinsic Indicators: Distributions of Total Scores

10. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 10 Extrinsic paper data from search engines and social-network services Sources: –CiteULike, LibraryThing, MendReader –Google, Metager Many papers have only hits in one service. To get useful data we apply the in-dubio-pro-reo rule and select maximum values. We assume that zero hits cannot be used as a valid value of an indicator and thus exclude papers without hits from the analysis. The hit distribution of papers with at least one hit is heavily skewed to the left: Many papers have only a few hits and only a few papers have many hits. We therefore use the logarithm of hit numbers as a more adequate representation.

11. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 11 Extrinsic paper data from social-network services

12. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 12 Extrinsic paper data from search engines: similar to social networks

13. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 13 Extrinsic paper data from search engines and social-network services All papers with social-network hits also have search engine hits. Both hit numbers correlate –quite well in each of the three groups for papers in English –and less well for papers in German

14. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 14 Extrinsic paper data from search engines and social networks: English

15. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 15 Extrinsic paper data from search engines and social networks: German

16. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 16 Citations in Google Scholar: citation distributions for samples of the three groups Not all papers are listed in Google Scholar. Only a few papers in German are in the sample. We omit them. Here we use the y-scale of dual logarithms of numbers of citation + 1. The addition of 1 is a usual bibliometric method to include papers without citations into the analysis of log-values. It can be justified with the argument that publishing a new result is its first citation.

17. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 17 Citations in Google Scholar: The total scores (mean ratings) Note, that the first (red) group is rated best but cited worst (in contrast to the results for search engines and social- network services, where for papers in English ratings and hit numbers on the aggregated level of thematic groups seem to correlate). Extrinsic author data remain a to do: an effective method for disambiguating authors is needed first

18. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 18 Correlation?

19. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 19 Correlation of intrinsic total score with extrinsic scores In the case of hits in social networks and in search engines there is no correlation with intrinsic total score as the scatterplots show.

20. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 20 Correlation of intrinsic total score with extrinsic scores: social networks

21. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 21 Correlation of intrinsic total score with extrinsic scores: social networks

22. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 22 Correlation of intrinsic total score with extrinsic scores: search engine data

23. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 23 Correlation of intrinsic total score with extrinsic scores: search engine data

24. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 24 Correlation of intrinsic total score with extrinsic scores The same is true for citations of papers in English drawn from Google Scholar

25. Interrelations of Indicators / Stefan Gradmann, Frank Havemann EERQI Final Conference, Bruxelles 15-16 March 2011 25 Conclusion As a consequence, to do any correlation analysis (including rank correlation) of these intrinsic and extrinsic paper data does not make any sense... … as long as such an analysis is based on paper attributes exclusively! → Effective author name disambiguation and disciplinary allocation is key Preliminary results do not yet invalidate the correlation methodology … … but they are revealing in terms of source data quality! How to understand the variance among the sub-samples?