Computational Evolutionary Biology & Bioinformatics

E-mail: msr@asu.edu
← Back to introduction
## dynamic *h-*type-index

*R* is the *R-*index and *v*_{h} is a measure of the rate of change of *h* through time. Rousseau and Ye (2008) suggest a number of ways to estimate *v*_{h}, including that it be determined over a fixed time interval (*e.g.*, 5 or 10 years) to make it more contemporary. They also suggest one use the rational *h* rather than *h* because its finer grained resolution will allow for better estimates of the rate of change of *h.*### History

## References

The dynamic *h-*type index (Rousseau and Ye 2008) is a measure of both the size of the core as well as how the core is changing through time. The basic index is

Here *v _{h}* for a given year is estimated as the slope of the regression of the rational

Year | h_{dyn} |
---|---|

1997 | n/a |

1998 | 4.4000 |

1999 | 6.6283 |

2000 | 10.9350 |

2001 | 15.0981 |

2002 | 19.0343 |

2003 | 24.4989 |

2004 | 32.9927 |

2005 | 41.9522 |

2006 | 51.6689 |

2007 | 60.7735 |

2008 | 70.3918 |

2009 | 83.8064 |

2010 | 93.6022 |

2011 | 102.1754 |

2012 | 108.1961 |

2013 | 115.4276 |

2014 | 124.2882 |

2015 | 131.6627 |

2016 | 137.4018 |

2017 | 139.2489 |

- Rousseau, R., and F.Y. Ye (2008) A proposal for a dynamic
*h-*type index.*Journal of the American Society for Information Science and Technology*59(11):1853–1855.