Is science driven by principal investigators?

In this paper we consider the question what is the scientific and career performance of principal investigators (PIs) of publicly funded research projects compared to scientific performance of all researchers. Our study is based on high quality data about (i) research projects awarded in Slovenia in the period 1994–2016 (7508 projects with 2725 PIs in total) and (ii) about scientific productivity of all researchers in Slovenia that were active in the period 1970–2016—there are 19 598 such researchers in total, including the PIs. We compare average productivity, collaboration, internationality and interdisciplinarity of PIs and of all active researchers. Our analysis shows that for all four indicators the average performance of PIs is much higher compared to average performance of all active researchers. Additionally, we analyze careers of both groups of researchers. The results show that the PIs have on average longer and more fruitful career compared to all active researchers, with regards to all career indicators. On long run, the PIs leading the research programs (the most prestigious grants) on average demonstrate the best scientific performance. In the last part of the paper we study 23 co-authorship networks, spanned by all active researchers in the periods 1970–1994, . . . , 1970–2016. We find out that they are well connected and that PIs are well distributed across these networks forming their backbones. We believe that our study shed new light to the relations between the public funding of the science and the scientific output. This research was partially supported by Slovenian Research Agency Program P1–0383 and Projects J1–8155, N1–0057. A. Kastrin University of Ljubljana, Faculty of Medicine, Institute for Biostatistics and Medical Informatics, Slovenia. E-mail: [email protected] J. Klisara University of Ljubljana, Faculty of Computer and Information Science, Slovenia. E-mail: [email protected] B. Lužar Faculty of Information Studies in Novo mesto, Slovenia & Pavol J. Šafárik University, Faculty of Science, Košice, Slovakia. E-mail: [email protected] J. Povh University of Ljubljana, Faculty of Mechanical Engineering, Slovenia. E-mail: [email protected] ar X iv :1 80 4. 01 06 2v 1 [ cs .D L ] 3 A pr 2 01 8 2 Andrej Kastrin et al.