So sánh phương pháp

	Chỉ số H	PubMed và MEDLINE
Lĩnh vực	Trắc lượng thư mục	Trắc lượng thư mục
Họ	Process / pipeline	Process / pipeline
Năm ra đời	2005	1966
Người khởi xướng	Jorge Hirsch, University of California San Diego	National Library of Medicine (NLM), U.S. National Institutes of Health
Loại	Metric	Database
Công trình gốc	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.	National Library of Medicine. (2024). PubMed: Home. Retrieved from https://pubmed.ncbi.nlm.nih.gov/
Tên gọi khác	Hirsch index, h factor, h-number	PubMed, MEDLINE, NLM, PubMed Central
Liên quan	5	5
Tóm tắt	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.	PubMed is a free, publicly accessible literature database maintained by the National Library of Medicine (NLM), a division of the U.S. National Institutes of Health. It provides access to biomedical and life sciences literature from MEDLINE (the curated subset of ~30 million indexed journal articles), life science journals, in-process articles, and preprints. MEDLINE, established in 1966, is the gold standard for biomedical literature indexing, using MeSH (Medical Subject Headings), a hierarchical controlled vocabulary of ~33,000 terms. PubMed is the primary discovery tool for clinicians, researchers, and healthcare professionals worldwide seeking evidence-based information.