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# Interdisciplinary researchers attain better long-term funding performance

## Abstract

Interdisciplinary research is on the rise globally. Yet, several studies have shown that it often achieves lower impact compared to more specialized work, and is less likely to attract funding. Here, we seek to reconcile such evidence by analyzing 44,419 research grants awarded by the research councils in the UK. We find that researchers with an interdisciplinary funding track record dominate the network of academic collaborations, both in terms of centrality and knowledge brokerage, but such a competitive advantage does not translate into immediate return. Our results based on a matched pair analysis show that interdisciplinary researchers achieve lower impact with their publications in the short run; however, they eventually outperform their specialized counterparts in funding performance, both in terms of volume and value. These findings suggest that pursuing an interdisciplinary career may require perseverance to overcome extra challenges, but can pave the way for a more successful endeavor.

## Introduction

Interdisciplinary research is increasingly regarded as the key to tackle contemporary complex societal challenges and to stimulate scientific innovation1,2,3. As high-impact discoveries often occur at the intersection of disciplines4,5, scientists have become more engaged in research areas that transcend the boundaries between traditional fields6,7, and increasingly collaborate across such boundaries8.

A higher uptake in interdisciplinary research has been widely reported across academia9, as there is now a much greater level of knowledge transfer between subjects among researchers10. Yet, these trends are somewhat intriguing when one looks at the evidences available on research outcomes, which suggest that—more often than not—interdisciplinary research may be an unrewarding enterprise in today’s highly competitive academic environment. In fact, it is only interdisciplinary work based on proximal combinations of different fields that achieves recognition and impact (as quantified by accrued citations), whereas distal combinations are usually perceived as too risky or heterodox11. Similarly, interdisciplinary research is often associated with lower citation rates12. For example, Levitt and Thelwall13 analyzed the publications from two selected years in the Scopus dataset and found that in the fields of life sciences, health sciences, and physical sciences, the average number of citations received by monodisciplinary articles is approximately twice that of multidisciplinary articles. Furthermore, by examining the research proposals submitted to the Australian Research Council’s Discovery Programme over 5 continuous years, Bromhaml et al.14 determined that interdisciplinary projects are less likely to be funded than those with a specialized focus.

Here, we ask whether interdisciplinary researchers share the same gloomy outlook in a longer time span and wider database. To this end, we compare the career progressions of researchers with a track record of research funding that can be unambiguously classified as either interdisciplinary or monodisciplinary. We examine data detailing more than 44,000 research grants funded between 2006 and 2018 by the seven discipline-based UK national research councils (collectively forming the bulk of the largest public funding body in the UK), which provide funding to universities and academic institutions to undertake research across a broad spectrum of fields, including arts and humanities, biology, economics, engineering and physics, medicine, environmental sciences and astronomy (details in Methods and Supplementary Table 1).

Through network analysis, we discover that researchers active across different disciplines play a crucial role of knowledge brokers in the academic collaboration network, bridging the gap between subjects and researchers that may otherwise remain disconnected. By means of a matched pair experimental design we find that, despite achieving comparatively lower impact, in the long run interdisciplinary researchers outperform their discipline-specific peers in funding performance, both in terms of number of grants and their funding size. Our findings help explain the continuous drive on interdisciplinary research, and provide insights on its role in the modern research funding landscape that may be useful to researchers and funding bodies alike.

## Results

### Evolution of cross-council behaviors

Between 2006 and 2018, the average team size increases over time, with team composition becoming more cross-institutional (Fig. 1a, b). This demonstrates an increasing trend of collaborative science in the UK funding landscape, which is consistent with rising teamwork and multi-institutional research in scientific publications15,16,17. A funded project can be associated with one or more research subjects out of 104 possible subjects. The level of cross-disciplinarity shows an upward trajectory (Fig. 1c), with nearly half of funded projects (44%) being related to at least two research subjects.

The above finding is consistent with the general shift towards more cross-disciplinary research1. However, it does not specify whether the same consideration may apply to individual researchers. To examine this, we divide the investigators into two groups: cross-council investigators and within-council investigators. The former are those who have obtained funding from at least two different research councils; while the latter are those who have received funding from one research council only. Admittedly, this is a rather coarse-grained separation that does not account for the different sizes of different councils and potential overlaps between them. Yet, let us reiterate that the fundamental units of our analysis are researchers. In this respect, we expect such separation to be able to capture fundamental differences in terms of career choices and breadth of research interests. In particular, we expect the cross-council investigators cohort to be made both of genuinely interdisciplinary researchers (i.e., those active in areas at the interface between well-defined disciplines) and multidisciplinary researchers (i.e., those active in more than one well-defined research area). Although such difference may be relevant in other contexts, in the following we will take the position that being a cross-council investigator represents the main indicator that a researcher seeks funding to push disciplinary boundaries with their work. To examine how the two groups of investigators evolve over time, we calculate the fraction of cross-council investigators in each year, and observe a marked increase as expected, from around 0.17 in 2006 to 0.26 in 2018 (Fig. 1d).

To better understand how this rise in cross-council investigators alters the funding landscape, we construct a co-activity network whereby nodes represent research councils. Two councils share a link if they both have supported at least one investigator, and links are weighted with the ratio between the observed number of investigators funded in both councils and the expected number based on a randomized null model (Supplementary Note 2). Starting with the 2006–2008 window (Fig. 1e), cross-council investigators are most commonly found between BBSRC and MRC, and between BBSRC and NERC. A decade later (2016-2018 window), the co-activity network becomes fully connected (Fig. 1f) with two new links connecting AHRC with MRC and STFC, respectively. In addition, the link weights of cross-council investigators between BBSRC and NERC, and between AHRC and ESRC soar by 29% and 90%, respectively. These shifts in the funding landscape appear to be the response to the UKRI policy to support research across council boundaries and enhance the culture of multidisciplinary research18.

Elite institutions have been found to be prime recipients of research funding, as they are key in orchestrating collaborations19 and generating research outputs20,21. We consider the total amount of funding received by institutions between 2006 and 2018 as a proxy of their national rank, and examine the level of cross-council activities among their investigators. For the sake of simplicity, institutions are grouped into two tiers, with the top tier consisting of 40 institutions (Tier I) that have received a higher than average total funding over the aforementioned 13 years period, and the remaining institutions forming the bottom tier (Tier II). There are noticeably more cross-council investigators in top tier institutions (Fig. 1g, h and Supplementary Note 3), in line with previous findings on the governing role on research innovation among top institutions22. On the other hand, the proportion of cross-council investigators in the bottom tier shows a bigger increase, from 18% to 26%, which is twice that of the top tier (with an increase from 27% to 31%).

### Structural advantage in the collaboration network

Our results have shown that interdisciplinary research is undoubtedly gaining momentum, with more cross-council investigators emerging across the university sector. To better understand this shift in collaborative science, we examine research partnerships among investigators and study the roles played by the cross-council and within-council groups. Here, network nodes are the investigators, and two investigators are connected if they have partnered in one or more research projects.

Cross-council investigators consistently show a much broader collaborative practice with a much higher average degree (Fig. 2a). They are also more likely to occupy prime locations or gateways for information dissemination, as demonstrated by both a higher closeness and betweenness centrality. Indeed, we find that cross-council investigators are much more likely to be brokers of information—as they are characterized by a higher average effective network size23—suggesting that they play a central role in establishing partnerships. Overall, the more diversified their funding source, the more advantageous their network position appears to be (Fig. 2b). By comparing the two groups of investigators with respect to their number of grants, our results on network metrics show systematic differences in their collaboration patterns (Fig. 2c), and the differences are most apparent among the more successful investigators.

### Research outcomes and scientific impact

Is there a detectable difference between the cross-council and within-council investigators in terms of research outcomes and scientific impact? To address this question, we need to control for the bias caused by possible confounding factors, so that the observed differences in research outcomes and scientific impact between the two groups can be more confidently ascribed to interdisciplinarity (i.e., cross-council funding behavior). Here, we perform a propensity score matching analysis24 whereby the career profile of a principal investigator (PI) is characterized by five confounding factors, namely the institutional ranking (measured by the total amount of funding received by the PI’s institution), the number of grants awarded to a given PI, and their average funding value per grant, team size and project duration. The last three factors have been adjusted to account for variations in values in different disciplines, and over time (Supplementary Note 6 and Supplementary Fig. 10). A cross-council investigator is then paired with a within-council investigator if the two share a comparable career profile between 2006 and 2013 (Fig. 3a), thereby eliminating the effect of these confounding factors on the phenomena under investigation (Fig. 3b and Supplementary Fig. 11). The analysis yields a total of 958 pairs of cross-council and within-council PIs.

For each matched pair of PIs, we compare their research performance based on the achievements reported in their grants awarded during 2006 and 2013 (but omitted projects that go beyond 2018 as the achievements reported would be incomplete), including the average number of papers reported per project, the average number of total citations received per grant, and the average number of citations received per paper per grant. Again, these metrics have been normalized across the different disciplines, and over time (Supplementary Note 6). We observe that while the two groups of investigators produce more or less the same number of publications, cross-council investigators clearly receive less citations in general than their within-council counterparts (Fig. 3c and Supplementary Table 2), both in terms of total citations (t-test, p=0.0021) and mean citations (t-test, p=0.0004), which is consistent with findings in prior studies6,12.

### Long-term funding trajectory

We finally compare the funding trajectory of cross-council investigators to that of within-council investigators. We refer to 2006–2010 as the in-sample period where investigators are paired, and 2011–2018 as the out-of-sample period in which funding performance of each pair of investigators is compared (Fig. 4a). On this occasion, the pairing is done by not only matching their career profiles but also their research performance (i.e., reported achievements in grants described in the previous section, Fig. 4b and Supplementary Fig. 12), yielding 709 investigator pairs. The cross-council investigator group outperform their within-council counterparts, as demonstrated by the notable gains in the number of grants and their value; as well as the average team size (Fig. 4c, Supplementary Table 3). For the sake of robustness, we repeat our analyses across different time periods, reaching the same conclusions (Supplementary Figs. 13 and 14). Moreover, we check a different definition of interdisciplinary investigators by examining the number of fields (based on the classification by Microsoft Academic Graph) in which they published, again reaching similar conclusions (Supplementary Note 7). These findings uncover previously unknown positive aspects of an interdisciplinary research career, providing a much needed optimistic outlook for those who wish to pursue this line of work14.

## Discussion

In this paper, we compare the careers of interdisciplinary investigators with those of investigators who are tied to a specific discipline. In line with other findings on the rise of interdisciplinary research9,10, we find that the fraction of cross-council investigators increases steadily during our period of observation. We also find that cross-council investigators sit more centrally than their peers in the academic collaboration network, which in turn provides them with considerable competitive advantage in terms of knowledge brokerage opportunities, but such a competitive advantage does not immediately translate into a higher academic impact in their publications.

There are a number of possible reasons for the comparatively lower impact of projects led by cross-council investigators. It is reasonable to argue that their role as knowledge brokers leads to considerable costs—both in terms of building collaborative relationship and establishing a common language to communicate across disciplines25—which may indirectly suppress their productivity. Also, despite a lack of consensus on its overall impact26,27, a number of studies have shown that interdisciplinary research tends to garner recognition over longer periods of time compared to more specialized research6,28. In this respect, we ought to acknowledge that our results may partially be due to the duration covered by our available data, which constrains our analyses to quantify impact with citations received within 5 years of publication. It is plausible that our conclusions about impact may be different over longer time periods. This limitation notwithstanding, our findings suggest that it may be very challenging for a junior researcher to pursue an independent interdisciplinary academic career. Indeed, all current practices of academic impact evaluation are to some extent influenced by citation-based bibliometric indicators29 and, therefore, may be stacked against junior interdisciplinary researchers receiving citations at a slower pace30.

However, the main result of our study shows that cross-council investigators eventually outperform their peers in terms of funding. This result is robust and statistically significant across different dimensions, with respect to the number of funded grants, the average funded value and the average team size per grant awarded. Although at face value this may seem to contradict previous findings on the lower funding success rate of interdisciplinary research14, we believe that this is not necessarily the case. Our results primarily focus on the funding performance of investigators in terms of volume and value—not of grant proposals—and do not speak to their success rate, as data about rejected proposals are not available to us. It is therefore possible that interdisciplinary investigators in our data may still secure funding at a lower success rate, although this would directly imply that they submit proposals in much larger numbers than their peers. Furthermore, let us mention that applicants to the vast majority of funding schemes from the UK research councils must hold a permanent position in a research institution in order to act as PIs. In this respect, survival bias does not represent a potential limitation to our analysis, as all the investigators in our data are—by definition—survivors.

All in all, we believe that the more plausible explanation for our findings is that indeed interdisciplinary investigators develop—on average—a better ability to attract funding in the long run. Squaring this with their lower impact in the short run suggests that interdisciplinary investigators may be late bloomers who tend to achieve success over a longer period of time; however, there are indications that their more diversified research portfolios could give them an edge in securing long-term tenure31.

## Methods

### Data sets

We collect 44,419 research projects conducted between 2006 and 2018 from UK Research and Innovation (UKRI), which includes the grant information from seven national discipline-based research councils, namely AHRC, BBSRC, ESRC, EPSRC, MRC, NERC and STFC (see Supplementary Note 1). Note that the disciplinary boundaries of the research councils system in the UK are explicitly defined, and an investigator would submit their research proposal to the most appropriate council by checking the remit domains of each possible council. The basic information for each research council has been summarized in Supplementary Table 1. The research grants cover the full spectrum of academic disciplines from the medical and biological sciences to astronomy, physics, chemistry and engineering, social sciences, economics, environmental sciences and the arts and humanities, which enables us to comprehensively investigate research and innovation in the UK. For each research project, we record the information of the title, abstract, the start date and end date, PI and co-investigators (CI), fund value, lead/collaborating institutions and scientific outcomes (i.e., publications). A grant is considered to be awarded to the PI and the affiliation of the PI. Information on how the overall funding of a given grant is divided among the rest of the investigators (and their affiliations) is not made available. Among them, there are 37, 677 research projects that have been classified with at least one research subject (a total of 104 subjects). All the research projects, investigators and institutions have been assigned with unique IDs, which eliminates the problem of name disambiguation.

For each research grant, all related papers published are recorded with the information of title and DOI. This provides the possibility for us to link the UKRI research grant database with the Microsoft Academic Graph (MAG) database by precisely matching the titles and DOI of the publications in two databases. MAG is a database consisting of a large amount of scientific publications, their citation records, dates of publication, information regarding the authorship, publication venues and more. We wish to point out that the dataset specifies the keywords for each paper, as well as the position of each such keyword in a field-of-study hierarchy, the highest level of which is comprised of 19 disciplines. Therefore, this connection between the two datasets not only offers us additional information about each paper, it also allows us to trace citations of each publication within the MAG and how these citations compare with other papers published in the same year and discipline. In the end, we match a total of 409,546 publications and calculate their accumulated citations 5 years after publication.

### Evolution of cross-council behavior

In the sliding window analysis, only investigators with at least two research grants have been tracked. We exclude those with one research grant only as they will distort the number of within-council investigators. Supplementary Fig. 1 illustrates the grant history of a cross-council investigator and a within-council investigator. Although the two investigators have obtained the same number of research grants throughout the studied period, their funding trajectories from the research councils are strikingly different.

### Collaboration network

The collaboration network is constructed by referring project partnerships between investigators between 2006 and 2018. In this network, nodes are investigators (PIs or CIs), and a link refers to a project partnership between two nodes. Research grants comprising only one investigator (i.e. only the PI) have been excluded from the network. We extract the largest connected component (LCC) of the collaboration network which consists of 86% of the investigators.

We then perform a node-level network analysis on all the investigators who are in the LCC, and only include those with at least 2 research grants during the studied period. In total, we obtain 6911 cross-council investigators and 12,563 within-council investigators. To further test whether this structural advantage exists across different time periods, we examine the collaboration network in the first 5-y window (2006–2010) and last 5-y window (2014–2018) of the available period, and find that our conclusions remain unchanged (see Supplementary Note 5 and Supplementary Figs. 8–9).

### Normalized effective size

The normalized effective size of node i’s ego network measures to which extent each of the first neighbors of i is non-redundant with respect to the other neighbors. Formally, for the case of unweighted and undirected graphs, the normalized effective size of a node i can be defined as23:

$${\zeta }_{i}=1-\frac{{k}_{i}-1}{{k}_{i}}{C}_{i}$$
(1)

where ki is the degree of the node and Ci is its clustering coefficient. This indicator can vary from 0 to 1 with ζi = 0 when the neighborhoods of i are fully connected, and ζi taking its largest value 1 when i is the center of a star, and there are no links among its collaborators. Generally, the larger the value of ζi, the less connected the neighborhood of i is, and consequently, the higher the brokerage opportunities for investigator i. Investigators acting as brokers, on the one hand, tend to exhibit weak ties with their collaborators. On the other hand, they are likely to gain exposure to a greater variance and novelty of information and link people with different ideas and perspectives32,33.

### Propensity score matching

To avoid the potential bias of covariates among PIs in the cross-council and within-council groups, we perform a propensity score matching analysis based on multi-variable logistic regression models, which is a statistical technique typically used to infer causality in observational studies24. Propensity scores (PSs) are defined as the predicted probability of being a cross-council PI conditional upon a set of observed covariates. Cross-council PIs are matched to within-council PIs based on their PSs in one-to-one ratio, using a nearest-neighbor algorithm within a caliper of 0.01 on the probability scale. After the matching, the characteristics of cross-council and within-council groups in all observed covariates are statistically indistinguishable, with standardized differences d < 0.1, t-tests p-value > 0.1 for the sample means, and Kruskal-Wallis tests p-value > 0.1 for the entire distributions.

## Data availability

The UKRI funding data used in the paper are publicly accessible and can be downloaded via https://www.ukri.org. The publication and citation data are available via Microsoft Academic (https://academic.microsoft.com). All other data are available from the corresponding author on reasonable request.

## Code availability

The code for used to perform pair matching is available at https://github.com/benmiroglio/pymatch. All other codes used in this study are available from the corresponding author on reasonable request.

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## Acknowledgements

We thank Xiancheng Li for sharing the MAG data. V.L. acknowledges the support for this research from the Leverhulme Trust Research Fellowship “CREATE: the network components of creativity and success”. G.L. acknowledges support by an EPSRC Early Career Fellowship in Digital Economy (Grant No. EP/N006062/1).

## Author information

Authors

### Contributions

All authors designed research; Y.S. collected the data and performed research; Y.S., G.L., A.M. and V.L. analyzed data and wrote the paper.

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Correspondence to Giacomo Livan.

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Sun, Y., Livan, G., Ma, A. et al. Interdisciplinary researchers attain better long-term funding performance. Commun Phys 4, 263 (2021). https://doi.org/10.1038/s42005-021-00769-z

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