Evolutionary Biological Data Science Laboratory

Year-based EM-index by publications

The Year-based EM-index by publications (Bihari and S. Tripathi 2018) is an adapation of the EM-index applied to the career years h-index by publications. This metric is a measure of publication intensity or distribution, rather than citation intensity as captured by most h-index type indices. Rather than create a list of publications ranked by citation count, one creates a list of years ranked by publication count. This list is then processed in the same multivariate manner as the EM-index.

Example

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

Year (yi)	1997	2000	2001	1998	1999
Publications per Year (Pi)	6	5	4	2	1
Rank (i)	1	2	3	4	5
			E1 = 3
Adjusted Publications (Pi)	3	2	1
Rank (i)	1	2	3
		E2 = 2

The sum of the 2 E values is 5. The Year-based EM-index by publications is the square-root of this sum, thus Yp_EM = 2.2361.

History