What is H – Index?
Last Updated :
18 Aug, 2020
What is H – index ? ‘H’ stands for Hirsch index as it was proposed by the J.E. Hirsch in 2005. The h-index is defined as the author-level metric that attempts to measure both the productivity and the citation impact of the publication of the scientist or the scholar.
There are two parameters to be considered –
- Quantity – Numbers of papers
- Quality – Number of citations
Basically, H-index is the largest number such that a number of publications have at least the same number of citations. As a useful index to characterize the scientific output of a researcher.
Calculating the H-index –
For example, consider a Researcher has published total 10 papers.
Research Paper |
No. of Citations |
1 |
50 |
2 |
40 |
3 |
33 |
4 |
23 |
5 |
12 |
6 |
11 |
7 |
8 |
8 |
5 |
9 |
1 |
10 |
0 |
H-index is always <= total numbers of papers published
For convenience let us arrange the number of citations in decreasing order.
H-index can not be 10, because there must be at least 10 research papers which have 10 or more than 10 citations. Similarly,
H-index can not be 9,
H-index can not be 8,
H-index is 7 as there are 7 research papers having 7 or more than 7 citations.
Example :
Input : Citations = [7, 6, 5, 4, 3]
Output : 4
Explanation : There are 5 papers in total.
Since the researcher has 4 papers with at least 4 citations each
and the remaining one paper has less than 4 citations.
So H-index is 4.
Approach for finding the H – index :
- Sort the citation array in ascending order or descending order.
- Iterate from the lowest paper to the highest paper.
- The remaining papers (result) is the count of papers that satisfy the condition for H-index.
def H_index(citations):
citations.sort()
for i, cited in enumerate (citations):
result = len (citations) - i
if result < = cited:
return result
return 0
citation = [ 50 , 40 , 33 , 23 , 12 , 11 , 8 , 5 , 1 , 0 ]
print (H_index(citation))
|
Output
Time Complexity : O(nlogn + n)
Space Complexity : O(1)
Limitations of H – Index :
- Different fields of researchers can have different citation behavior.
- We can not compare two researchers having different field and huge gap of research experience. Experienced researcher will have high H-index as compare to less experienced researcher.
- H-index value depends on the database you are using it may vary for the different platform.
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