Metrics: What's in a number?
What's in a number?
by Dr Arpan Pradhan
Some Important Indexing Parameters
Journal
Metrics
1.
Impact
Factor:
ü
IF=N/D
(in Year 4); for (D) Documents in Year 1 and 2 with (N) number of citations of
D documents in Year 3.
ü
It
is Year Specific
ü
Requires
4-year data
ü
All
Documents, D (Articles in particular Journal) and Citations (N)
in Web of Science
ü
It
is a Relative Journal Metric
2.
5
year IF:
ü IF=N/D (in Year 7); for (D) Documents in Year 1 and 5
with (N) number of citations of D documents in Year 6.
ü Same as IF
3.
CiteScore
ü
5th
year Publication
ü CiteScore=Citations/Documents (in 4 Years)
4.
IC
Value
ü
Core
WoS and Scopus 4.5
ü
ESCI
and Scopus 3.5
+
ü
Additional
One database 3
ü
Additional
Two database 5
+
ü
Survival
Year = Y log(Y)
Author
Metrics
5.
h-index
ü
Graph;
X-Axis = Articles, Y-Axis=Citations
ü
Arrange
in Descending Order of Citations
ü
Find
the Number that describes:
ü
“Maximum
h such that h articles are cited at least h times each.”
6.
m-index
ü
m-index
= h-index/ (No. of Years of Existence of the Author)
ü
Acts
as a Normalizing factor, for h-index
7.
g-index
ü
Maximum
‘g’ such that the top ‘g’ articles are cited a total of g2 times
ü
Acts
as a Normalizing factor, for h-index
8.
i10
index
ü
Number
of articles that are cited at least 10 times
ü
by
Google
9.
h5
index and h5-median
ü
Maximum
‘h’ such that ‘h’ articles published in last 5 years are cited at least h times
each
ü
h
index of last five years
ü
Median
of these 5 years is “h5-median”
Disadvantages of Indexing Parameters taken under Study
Journal
Metrics
1.
Impact
Factor:
ü
It
is Year Specific and does not count the total citations of a journal
2.
5
Year Impact Factor:
ü
It
is Year Specific and does not count the total citations of a journal
ü
Advantage
over IF, is that it takes 5-year Citations
3.
CiteScore
Relationship
Calculation of Journal Metrics: Advances in Water Resources
https://www.journals.elsevier.com/advances-in-water-resources
1.
Impact
Factor: 4.016 (2019)
2.
5
Year Impact Factor: 4.277 (2019)
3.
IC
Value: 4.5+5+log(43)=11.13 (1977
to 2020)
4. CiteScore: 7.6 (2019)
Calculation of Author Metrics: Arpan Pradhan
1.
h-index = 4
2.
m-index = 4/7 (i.e. 2014 to 2020) = 0.57
3.
g-index = 5
4.
i10
index = 0
5.
h5
index = 3
6.
h5-Median
= 2 (Median value of citations)
These indexing parameters provide only some information about the journal or the authors, and in no way provides a holistic view of the quality of the journal nor the author.
In the case of Journal metrics, CiteScore provides
some justification to the Journal, as the citations for the last 5 years is
taken into consideration. Whereas the other two popular metrics, IF and 5year
IF, although reliable in some sense, considers citations of that particular
year.
As a researcher, I believe citation of an article
should have higher weightage than the journal in which it is published and over
a period rather than just for a single year.
Hence, similar to 5-year IF, I would propose a metric
where the citations of a journal for a 5 year period are also considered, or at
least the average of the last 5 years of IF values.
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