Dry goods | how to calculate the KPI of scientific researchers, and what are the h index and G index

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This is one brain cloud research circle , I am a Uka～

Speaking of KPI Everyone must be familiar , Whether you are working or reading, you know something more or less ——KPI It is an important visual indicator to evaluate employees' work performance , Is the foundation of enterprise performance management .

So in academia , How much of a researcher's research results should be measured ？ Is there anything similar in academia KPI Such indicators ？

Don't say , There are ！

What we want to introduce today is “ Academia KPI”——H Index and G Index .

All of them measure the academic achievements of researchers KPI, What do they have in common , What's the difference ？

Idle time , Come and have a look with me ～

1

H Index

H Index （H-index） It is a mixed quantitative index , It can be used to evaluate the number and level of academic output of researchers , As early as 2005 By American physicist George · Hirsch proposed , Sometimes it's also called Hirsch Index or Hirsch Count .

H The index is calculated based on the number of researchers' papers and the number of citations . Hirsch thinks ： A person has... In all his academic articles N At least one of the papers was cited N Time , His H The index is N.

Such as Richard, an immunologist at Yale University · Fravo （Richard A. Flavell） Published 900 In this article , Yes 107 This article is quoted 107 More than once , His H The index is 107.

This is from the Internet

A person's can be determined as follows H Index ：

（1） To publish all SCI Papers are ranked from high to low according to the number of citations ;

（2） Find the sorted list from front to back , As long as the current reference is greater than the current index value , be H Exponential plus 1, The final result is the final H Index .

later , Braun (Braun) They further developed the idea , take H The index is used to evaluate the academic influence of periodicals .

And make the following definitions ： For a journal , If all the papers it publishes have H An article , The number of citations per article shall be at least H, At the same time, be satisfied with H This natural number is the largest , that H It is the H Index .

H Although the index can objectively reflect the academic output level of researchers to some extent , But it has come under some criticism ：

First ,H The index largely depends on the academic career time of researchers , The longer the time ,H The larger the index , also H The index will only increase but not decrease .

secondly , Some researchers believe that （ Zhouchunlei ,2008）,H The index calculation method hides a major defect that can be accurately injected , Cheaters can quickly improve their performance by quoting several key documents H Index .

therefore , In order to solve H Problems with the index , Scholars have proposed another measurement index ——G Index .

2

G Index

G Index （G-index） yes H A derivative index of an index , Mainly to make up for h The index can not well reflect the defects of highly cited papers .

G The index is Leo Egghe stay 2006 Author level index proposed in , The index is still calculated based on the number of citations of a given researcher's publication .

The definition for ： Given a group of articles, they are arranged in descending order of the number of citations ,G The index is cumulatively quoted at least g² The largest paper order of times g, And the first (g+1) The cumulative number of citations corresponding to sequential papers will be less than (g+1)².

for example ：G-index by 10 Indicates the author's previous 10 This publication has been cited at least 100 Time （10²）,G-index by 20 Indicates the author's previous 20 Publications were cited 400 Time (20²).

This is from the Internet

thus , As the ranking of papers increases , The number of citations required is also increasing , Effectively avoided H The problem of accurate water injection may exist in index calculation .

3

Summary

Whether it's H The index is still G Index , The achievements of scientific researchers can never be easily defined by a simple number . If you want to know a scholar, you should read him in a down-to-earth way （ she ） Published works , Just like our academic path , There has never been a shortcut .

So that's all for today's sharing , Do you have any interesting knowledge or opinions about the evaluation indicators of scholars or journals to share with us , Leave a message in the comments section , Tell us ～

reference

[1]G- Index . (2021, November 18). Baidu Encyclopedia .

https://baike.baidu.com/item/g%E6%8C%87%E6%95%B0/3122201

[2]H- Index . (2022, May 27). Wikipedia .

https://en.wikipedia.org/wiki/H-index

[3] Jiangchunlin , Liu Zeyuan , & Liangyongxia . (2006). H Index and g Index —— A new index for evaluating the academic influence of periodicals . Library and information work , 50(12).

[4] Wang Hao , Chen fengjuan , & Li Xuan . (2010). Chinese psychological journal h Index analysis . JOURNAL OF SOUTHWEST UNIVERSITY FOR NATIONALITIES ： Humanities and Social Sciences (10), 6.

[5] Zhouchunlei . (2008). H The potential pitfalls of the index ——h Research on exponential precise water injection . Library and information work ,52(8), 4.

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