Michael S. Rosenberg’s Laboratory

Computational Evolutionary Biology & Bioinformatics

E-mail: msr@asu.edu
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characteristic time scale of scientific activity

The characteristic time scale of scientific activity of a researcher (th index) (Popov 2005) is the amount of time from the present to the past accounting for publications to which the researcher receives half of their citations. Put another way, if one sums a researcher's citations in reverse chronological order by publication, it is the number of years necessary to reach half of their total citations.

Example

Publications are ordered by year of publication, from most recent to oldest.

Year (Yi)2001200120012001200020002000200020001999199819971997199719971997
Citations (Ci)21003621102114214993
Cumulative Citations (ΣCi)23333941424343455698112121130133
½CP = 66.5

The first year where ΣCi ≥ ½CP is 1997, thus the characteristic time scale of scientific activity is 2001 − 1997 + 1 = 5

History

Yearth
19971
19982
19993
20004
20015
20023
20034
20045
20056
20066
20077
20088
20099
201010
201111
201212
201313
201414
201514
201615
201716

References