Evolutionary Biological Data Science Laboratory

Year-based EM-index by citations

The Year-based EM-index by citations (Bihari and S. Tripathi 2018) is an adapation of the EM-index applied to the citation counts received in a year (to all publications), rather than citations clustered by year of publication. One creates a list of years ranked by citations received that year for all publications. This list is then processed in the same multivariate manner as the EM-index.

Example

Years are ordered by number of citations received that year, from highest to lowest. After each step, E_i is subtracted from the citations of the top E_i years. All years beyond the top E_i are ignored at subsequent steps.

Year (yi)	2001	2000	1999	1998	1997
Citations received in year (Ci)	63	41	28	14	2
Rank (i)	1	2	3	4	5
				E1 = 4
Adjusted Citations (Ci)	59	37	24	10
Rank (i)	1	2	3	4
				E2 = 4
Adjusted Citations (Ci)	55	33	20	6
Rank (i)	1	2	3	4
				E3 = 4
Adjusted Citations (Ci)	51	29	16	2
Rank (i)	1	2	3	4
			E4 = 3
Adjusted Citations (Ci)	48	26	13
Rank (i)	1	2	3
			E5 = 3
Adjusted Citations (Ci)	45	23	10
Rank (i)	1	2	3
			E6 = 3
Adjusted Citations (Ci)	42	20	7
Rank (i)	1	2	3
			E7 = 3
Adjusted Citations (Ci)	39	17	4
Rank (i)	1	2	3
			E8 = 3
Adjusted Citations (Ci)	36	14	1
Rank (i)	1	2	3
		E9 = 2
Adjusted Citations (Ci)	34	12
Rank (i)	1	2
		E10 = 2
Adjusted Citations (Ci)	32	10
Rank (i)	1	2
		E11 = 2
Adjusted Citations (Ci)	30	8
Rank (i)	1	2
		E12 = 2
Adjusted Citations (Ci)	28	6
Rank (i)	1	2
		E13 = 2
Adjusted Citations (Ci)	26	4
Rank (i)	1	2
		E14 = 2
Adjusted Citations (Ci)	24	2
Rank (i)	1	2
		E15 = 2

The sum of the 15 E values is 41. The Year-based EM-index by citations is the square-root of this sum, thus Yc_EM = 6.4031.

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