Adjusted impact factors for comparisons between disciplines

Tang, Jiang; Wong, Tak Ming; Liu, J. L. Y.

doi:10.1136/jech.53.11.739b

Journal of Epidemiology & Community Health

1999

DOI: 10.1136/jech.53.11.739b

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Adjusted impact factors for comparisons between disciplines

Jiang Tang¹,

Tak Ming Wong²,

J. L. Y. Liu³

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Cited by 2 publications

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Quality of impact factors of general medical journals

Porta

2003

BMJ

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Editor-The former Public Health Laboratory Service (PHLS) (now Health Protection Agency) states that there is no need for students returning from areas affected by the severe acute respiratory syndrome (SARS) to be excluded or quarantined unless they are unwell. 1 However, the agency is aware that some schools are advising parents differently. 1 Unfortunately, some Chinese students are subjected to quarantine imposed by their schools, which becomes very disruptive to these students' schooling. One boarding school was reported to be excluding students returning from certain parts of the Far East after Easter. 2 After receiving inquires from anxious Chinese guardians about whether Chinese students should be quarantined, I searched the internet using the terms "SARS" and "school" on www.freeserve.com to identify policies about the syndrome in different schools. After visiting the first 100 websites in the United Kingdom, I identified the policies of 10 schools. The table shows the results.

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Quality of impact factors of general medical journals

Porta

2003

BMJ

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Percentile-Based Journal Impact Factors: A Neglected Collection Development Metric.

Wagner¹

2009

ISTL

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Various normalization techniques to transform journal impact factors (JIFs) into a standard scale or range of values have been reported a number of times in the literature, but have seldom been part of collection development librarians' tool kits. In this paper, JIFs as reported in the Journal Citation Reports (JCR) database are converted to percentiles (0%-100%) using Microsoft Excel's PERCENTRANK function. This permits a more intuitive evaluation of journal ranking within JCR subject categories and broader disciplines. The top journal by impact factor in any category is set to 100% while the lowest impact factor journal is set to 0% with all other journals on the list scaled according to their rank. Percentile-based impact factors (PIFs) also allow valid cross-disciplinary comparisons of impact factors, something not possible using JIFs. Finally, since a given journal title is often assigned to multiple subject categories, the relative impact of the same journal title can be compared and evaluated across each of those categories. This paper argues that PIFs should become a standard component of journal collection evaluation projects. The history, use, and misuse of impact factors are also discussed. [ABSTRACT FROM AUTHOR]

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Adjusted impact factors for comparisons between disciplines

Cited by 2 publications

References 5 publications

Quality of impact factors of general medical journals

Quality of impact factors of general medical journals

Percentile-Based Journal Impact Factors: A Neglected Collection Development Metric.

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