Salīdzināt metodes

	Directory of Open Access Journals	H-indekss	Žurnāla ietekmes faktors
Nozare	Bibliometrija	Bibliometrija	Bibliometrija
Saime	Process / pipeline	Process / pipeline	Process / pipeline
Izcelsmes gads	2003	2005	1955
Autors	DOAJ Community (Swedish library consortium, later expanded to international consortium)	Jorge Hirsch, University of California San Diego	Eugene Garfield, Institute for Scientific Information (ISI)
Tips	Database	Metric	Metric
Pirmavots	Directory of Open Access Journals. (2024). About DOAJ. Retrieved from https://doaj.org/	Hirsch, J. E. (2005). An index to quantify an individual's scientific research output. Proceedings of the National Academy of Sciences USA, 102(46), 16569-16572.	Garfield, E. (1972). Citation analysis as a tool in journal evaluation. Science, 178(4060), 471-479.
Citi nosaukumi	DOAJ, Directory of Open Access	Hirsch index, h factor, h-number	IF, JIF, Impact Factor, 2-year Impact Factor
Saistītās	5	5	5
Kopsavilkums	The Directory of Open Access Journals (DOAJ) is a community-maintained, freely accessible directory of high-quality, peer-reviewed open-access journals and articles established in 2003. DOAJ indexes over 20,000 open-access journals across all disciplines (sciences, social sciences, humanities, arts) from diverse geographic regions. The directory serves researchers, librarians, and administrators as the authoritative curated list of legitimate open-access journals—differentiating quality open-access publications from predatory journals that lack genuine peer review. DOAJ quality seal, awarded to journals meeting stricter governance and transparency criteria, enables identification of the highest-caliber open-access publications.	The h-index, or Hirsch index, is a quantitative metric proposed by physicist Jorge Hirsch in 2005 to measure researcher productivity and citation impact simultaneously. A researcher has an h-index of h if they have published at least h papers, each cited at least h times. For example, an h-index of 20 means the researcher has 20 papers each cited at least 20 times. The h-index is widely used in research evaluation, hiring, and promotion decisions, though experts debate its limitations. It provides a single number balancing quantity of publications against quality of citations, offering an intuitive summary of research career impact.	Journal Impact Factor (JIF) is a metric developed by Eugene Garfield in 1955 and published annually by Clarivate Analytics through Journal Citation Reports (JCR). It measures the average citation frequency of articles published in a journal over a two-year window, serving as a proxy for journal prestige and influence. A journal's Impact Factor equals the number of citations received in year Y to articles published in Y-1 and Y-2, divided by the number of citable items published in that same window. Despite widespread adoption in research evaluation, Impact Factor has significant limitations and critics argue it conflates journal prestige with article quality.