Computational Evolutionary Biology & Bioinformatics

E-mail: msr@asu.edu
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## collaborative index

### Example

### History

## References

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 *f _{a}* is the number of publications having

# of Authors (a) | 1 | 2 | 3 | 4 |
---|---|---|---|---|

# of Publications (f)_{a} | 5 | 3 | 3 | 5 |

Product (a×f)_{a} | 5 | 6 | 9 | 20 |

The sum of the products is 40, which yields a collaborative index of 2.5 when divided by the total number of publications (16).

Year | CI |
---|---|

1997 | 3.0000 |

1998 | 2.8333 |

1999 | 3.0000 |

2000 | 2.8333 |

2001 | 2.5000 |

2002 | 3.1500 |

2003 | 3.3750 |

2004 | 3.3333 |

2005 | 3.0312 |

2006 | 3.0000 |

2007 | 2.9444 |

2008 | 3.0000 |

2009 | 2.9048 |

2010 | 3.5625 |

2011 | 3.5000 |

2012 | 3.4906 |

2013 | 4.0000 |

2014 | 3.9016 |

2015 | 3.9206 |

2016 | 3.9538 |

2017 | 4.0597 |

- Lawani, S.M. (1980)
*Quality, Collaboration and Citations in Cancer Research: A Bibliometric Study*(doctoral dissertation). Florida State University: Tallahassee, Florida.