collaborative index
The Collaborative Index (Lawani 1980) is a basic measurement of the degree of collaboration within a set of publications. It is calculated as:
$$\text{CI}=\frac{\sum\limits_{a=1}^{a_\max}{af_a}}{P},$$where fa is the number of publications having a authors and amax is the largest number of authors for any publication.
Example
| # of Authors (a) | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| # of Publications (fa) | 7 | 3 | 3 | 5 |
| Product (a×fa) | 7 | 6 | 9 | 20 |
The sum of the products is 42, which yields a collaborative index of 2.3333333333333335 when divided by the total number of publications (18).
History
| Year | CI |
|---|---|
| 1997 | 2.6667 |
| 1998 | 2.3750 |
| 1999 | 2.5556 |
| 2000 | 2.5714 |
| 2001 | 2.3333 |
| 2002 | 2.9545 |
| 2003 | 3.1923 |
| 2004 | 3.1724 |
| 2005 | 2.8571 |
| 2006 | 2.8333 |
| 2007 | 2.7949 |
| 2008 | 2.8537 |
| 2009 | 2.7778 |
| 2010 | 3.4118 |
| 2011 | 3.3636 |
| 2012 | 3.3571 |
| 2013 | 3.8548 |
| 2014 | 3.7656 |
| 2015 | 3.7463 |
| 2016 | 3.7826 |
| 2017 | 3.8429 |
| 2018 | 3.9867 |
| 2019 | 3.9474 |
| 2020 | 3.9091 |
| 2021 | 3.9494 |
| 2022 | 4.0952 |
| 2023 | 7.6941 |
| 2024 | 7.6163 |
References
- Lawani, S.M. (1980) Quality, Collaboration and Citations in Cancer Research: A Bibliometric Study (doctoral dissertation). Florida State University: Tallahassee, Florida.