Robust parameterisation of ages of references in published research
作者：
Highlights：
• A gamma distribution is at least as good as lognormal to model the age of references.
• Minimum distance estimation produces robust estimates of distribution parameters.
• Gamma distribution scale and shape parameters characterise research disciplines.
• Gamma distribution parameters more meaningful than the Price Index, half-life, etc.
• Few articles show evidence of referencing both ephemeral and classic literature.
摘要
•A gamma distribution is at least as good as lognormal to model the age of references.•Minimum distance estimation produces robust estimates of distribution parameters.•Gamma distribution scale and shape parameters characterise research disciplines.•Gamma distribution parameters more meaningful than the Price Index, half-life, etc.•Few articles show evidence of referencing both ephemeral and classic literature.
论文关键词：Price index,Age of references,Gamma distribution,Minimum distance estimation,Classic literature,Ephemeral literature,Recency of references,Publication rate
论文评审过程：Received 18 January 2020, Revised 25 April 2020, Accepted 27 April 2020, Available online 21 May 2020, Version of Record 21 May 2020.
论文官网地址：https://doi.org/10.1016/j.joi.2020.101048
