Science, 251:25, 1991
David P. Hamilton

Also see .    Pendlebury DA "Science, Citation, and Funding" (letter to the editor) Science 251:1410-1411, 1991
                .    Hamilton DP "Publishing by -- and for? -- the Numbers" Science, 250:1331-2, 1990
Research Papers: Who's Uncited Now?
Scientists who like to one-up their colleagues in other disciplines can now do so in a new way. Last month, David Pendlebury of the Philadelphia-based Institute for Scientific Information came up with the startling conclusion that 55% of the papers published in journals covered by ISI's citation database did not receive a single citation in the 5 years after they were published (Science, 7 December, p. 1331). Now Pendlebury has extended his analysis by looking at how the "uncitedness rate" varies among scientific disciplines. Neither engineering researchers nor social scientists are likely to be happy with the results.

In this latest study, Pendlebury looked only at papers published in 1984 and the citations they accumulated through 1988. (ISI's database covers the top 10% of all scientific journals published worldwide.) When he grouped the data into broad categories, Pendlebury found that physics and chemistry had the lowest rates of uncitedness -- 36.7% and 38.8% of the papers published in those disciplines, respectively, were not cited at all in the 4 years following publication. Close behind were the biological sciences (41.3%), the geosciences (43.6%), and medicine (46.4%). These subjects all fall below the uncitedness average of 47.4% for the so-called hard sciences -- all scientific disciplines including engineering and medicine, but excluding the social sciences. (Pendlebury had first reported the hard science average as 40%; the later number, he says, is "more systematically generated.")

The figure for engineering, however, is above that average -- well above it, in fact. More than 72% of all papers published in engineering had no citations at all. Pendlebury says he is at a loss to explain this anomaly, although he suggests that "sociological factors" might influence the way engineering researchers cite each other's work.

Within these broad categories, there is a wide variation among individual sub-disciplines. Atomic, molecular, and chemical physics, a field in which onlv 9.2% of articles go uncited, took top honors. Next was virology, with an uncitedness rate of 14.0%. In rapid succession came particle and field physics (16.7%) inorganic and nuclear chemistry ( 17.0%), nuclear physics (17.3%), fluid and plasma physics (18.2%), organic chemistry (18.6%), condensed matter physics (19.1%), and biochemistry and molecular biology, (19.4%). Among fields that didn't fare so well: electrochemistry (64.6%), developmental biology (61.5%), optics (49.1%), and acoustics (40.1%).

As for engineering, every field showed high rates of uncitedness, with civil engineering highest at 78.0%. Next came mechanical (76.8%), aerospace (76.8%), electrical (66.2%) chemical (65.8%), and biomedical (59.1%) engineering. A handful of other applied fields showed similarly high rates: construction and building technology (84.2%), energy and fuels (80.3%), applied chemistry (78.0%), materials science-paper and wood (77.6%), metallurgy and mining (75.2%), and materials science-ceramics (72.8%).

Papers published in the social sciences fared no better. Political science (90.1%), international relations (82.8%), language and linguistics (79.8%), anthropology (79.5%), sociology (77.4%), business (76.6%), and archeology (76%) all exceeded the social science average of 74.7%. Social psychology articles, on the other hand, seem to be relatively highly cited; only 35.4% received no citations at all.

But scientists, social and otherwise, can take heart. Within the arts and humanities (where admittedly citation is not so firmly entrenched), uncitedness figures hit the ceiling. Consider, for example, theater (99.9%), American literature (99.8%), architecture (99.6%), and religion (98.2%). And, in one curious anomaly, articles in history (95.5%) and philosophy (92.1%) were relatively uncited, while those in history and philosophy of science (29.2%) were not.


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