In which fields do higher impact journals publish higher quality articles?

Abstract

The Journal Impact Factor and other indicators that assess the average citation rate of articles in a journal are consulted by many academics and research evaluators, despite initiatives against overreliance on them. Undermining both practices, there is limited evidence about the extent to which journal impact indicators in any field relate to human judgements about the quality of the articles published in the field’s journals. In response, we compared average citation rates of journals against expert judgements of their articles in all fields of science. We used preliminary quality scores for 96,031 articles published 2014–18 from the UK Research Excellence Framework 2021. Unexpectedly, there was a positive correlation between expert judgements of article quality and average journal citation impact in all fields of science, although very weak in many fields and never strong. The strength of the correlation varied from 0.11 to 0.43 for the 27 broad fields of Scopus. The highest correlation for the 94 Scopus narrow fields with at least 750 articles was only 0.54, for Infectious Diseases, and there was only one negative correlation, for the mixed category Computer Science (all), probably due to the mixing. The average citation impact of a Scopus-indexed journal is therefore never completely irrelevant to the quality of an article but is also never a strong indicator of article quality. Since journal citation impact can at best moderately suggest article quality it should never be relied on for this, supporting the San Francisco Declaration on Research Assessment.