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You are what you read: bias, journal prestige and manipulation
  1. Manishaa Vairavan1,2,
  2. Andrew Prayle1,2,
  3. Patrick Davies1,2
  1. 1Paediatric Critical Care, Nottingham University Hospitals NHS Trust, Nottingham, UK
  2. 2Child Health, University of Nottingham, Nottingham, UK
  1. Correspondence to Dr Patrick Davies, Paediatric Critical Care, Nottingham University Hospitals NHS Trust, Nottingham NG2 5HW, UK; patrick.davies{at}

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Researchers aim to publish in the highest-ranking journal possible to enable wider dissemination and for career advancement. Journals are ranked in many ways (table 1), but scientific quality is not important for these rankings.

An excellent example is a now retracted (therefore uncitable) paper looking at a possible link between MMR vaccine and autism. This was published in one of the highest Impact Factor journals in the world and was subsequently found to be fraudulent. Prior to full retraction, it had gained 3563 citations, which increased the standing of that journal.

Ranking methods

Impact factor (IF) was one of the first critical evaluation systems developed to check journal quality, created in 1955.1 The 2-year journal impact factor is the ratio between the number of citations received in that year for publications in that journal that were published in the two preceding years and the total number of ‘citable items’ published in that journal during the two preceding years.2 Most famous journals have an IF around 60. The immediacy index performs a similar calculation, but only uses data from the last complete year.

The cited half-life is the number of years accounting for half of the current citations received by a journal. It can vary with several factors, for instance older journals will trend to a higher cited half-life.

H-index, or Hirsch’s Index, can rank individual researchers as well as …

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  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Patient consent for publication Not required.

  • Provenance and peer review Not commissioned; externally peer reviewed.

  • Data availability statement There are no data in this work