Collaboration Metrics from the UF Network Data, and Their Evolution
Part I: Combining Networks From Publication And Grant Activity
Collaborations on publications and grants among UF researchers generate two different social networks. Their union gives us the most accurate and comprehensive picture of the UF scientific network available in the data. In the “union” network, relations can represent collaborations on a grant, a publication, or both. The position of specific actors, such as patent authors, and the relations among them, can be highlighted in the network.
Part II: Collaboration Metrics Based On Network-Level Measures Of Cohesion
Measures of network cohesion and distance show that the UF scientific network became more cohesive, that is, the overall tendency to scientific collaboration increased in the university over 2008-2012. During the same years, the CTSI came to cover an increasingly large part of the UF network, and distances between UF scientists became gradually lower.
Part III: Collaboration Metrics Based On Node-Level Measures Of Centrality
Different metrics can be used to assess the centrality of researchers in the UF scientific community. Degree centrality is the number of collaborators a researcher has, that is, his degree of connectedness to the network. Betweenness centrality is a measure of brokerage, as it quantifies the extent to which a researcher falls on the network paths between other researchers, and is a bridge between separate areas of the network. Closeness centrality measures the extent to which a scientist is close to every other actor, and can easily reach to the rest of the network. Researchers in the CTSI show higher centrality values on average on all these measures in 2008-2012, in both the publication and grant networks, compared to researchers outside the CTSI. In other words, the CTSI gathers some of the most central UF scientists, who tend to be better connected to the university scientific network, more often located in brokering positions between different research groups, and able to more easily reach to other UF scientists to whom they are not directly connected.
Part IV: Collaboration Metrics Based On Diversity Of Actor Attributes
In our scientific networks, the neighborhood of a researcher is the set of all his collaborators in a year. Thus, the degree of department, college or discipline diversity in a researcher’s neighborhood measures the extent to which that researcher engages in interdisciplinary research. CTSI researchers show a higher neighborhood diversity on average over 2008-2012, which means that the CTSI has functioned as a hub for interdisciplinary research at UF in the last years. This is confirmed by the higher number of authors per publication and investigators per grant in the CTSI, compared to the rest of the university. Finally, the CTSI exhibits a prevalence of “open triads” of researchers, as opposed to closed triads, over the years. As open triads tend to connect separate and distant areas of the network, this structural feature of the CTSI network suggests as well an increasing diversity of backgrounds, methods, and substantive topics in CTSI research activities.