Measuring university size: A comparison of academic personnel versus scientific talent pool data

Abstract This paper compares two measures of the organizational size of higher education institutions (HEIs) widely used in the literature: the number of academic personnel (AP) measured according to definitions from international education statistics, and the scientific talent pool (STP) (i.e., the number of unique authors affiliated with the HEI as derived from the Scopus database). Based on their definitions and operationalizations, we derive expectations on the factors generating differences between these two measures, as related to the HEI’s research orientation and subject mix, as well as to the presence of a university hospital. We test these expectations on a sample of more than 1,500 HEIs in Europe by combining data from the European Tertiary Education Register and from the SCImago Institutions Ranking. Our results provide support for the expected relationships and also highlight cases where the institutional perimeter of HEIs is systematically different between the two sources. We conclude that these two indicators provide complementary measures of institutional size, one more focused on the organizational perimeter as defined by employment relationships, the other on the persons who contribute to the HEI’s scientific visibility. Comparing the two indicators is therefore likely to provide a more in-depth understanding of the HEI resources available.