Impact Factor（インパクトファクター）

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Impact Factor

2013/9/27

rev 2021/7/15

Impact Factor 1 Impact Factor 2 Impact Factor 3 Impact Factor 4 Impactfactor 5 EigenFactor 6 6

Impact Factor

Impact factor Eugene Gerfield 1996Impact factor Gerfield Thomson Clarivate Analytics Journal Citation Reports

Impact Factor

Impact factor

A(year) = (B(year1) + B(year2)) / (C(year1) + C(year2))

year A(year) B(year1) B(year2) C(year1) C(year2)

year Impact factor year year year year year year

2019 502018 40 2020 2



1

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2019 80 2018 60

2020 Impact Factor = (80 + 60) / (50 + 40) = 1.55

6 ImpactFactor 2021 ImpactFactor 2022 6

Impact Factor Impact Impact Factor Impact Factor

Impact Factor

Impact Factor Impact Factor 10

2020 1

2 3 4 5 6 7 8 9 10

Journal Title JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS NPG Asia Materials SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS Digestive Endoscopy JOURNAL OF GASTROENTEROLOGY Gastric Cancer INFLAMMATATION AND REGENERATION Journal of Hepato-Biliary-Pancreatic Sciences CANCER SCIENCE Sustainability Science

Impact Factor 12.927

10.481 8.090 7.559 7.527 7.370 7.354 7.027 6.716 6.367

Clarivate Analytics Journal Citation Reports 2020



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2020 1 2 3 4 5 6 7 8 9 10

Journal Title CA-A CANCER JOURNAL FOR CLINICIANS NATURE REVIEWS MOLECULAR CELL BIOLOGY NEW ENGLAND JOURNAL OF MEDICINE NATURE REVIEWS DRUG DISCOVERY LANCET NATURE REVIEWS CLINICAL ONCOLOGY NATURE REVIEWS MATERIALS NATURE ENERGY NATURE REVIEWS CANCER NATURE REVIEWS MICROBIOLOGY

Clarivate Analytics Journal Citation Reports 2020

Impact Factor 508.702 94.444 91.245 84.694 79.321 66.675 66.308 60.858 60.716 60.633

Impact Factor Impact Factor Impact Factor Impact Factor

Impact Factor

Journal Citation ReportsJCRJCR WEB WEB WEB JCR Impact Factor Impact Factor

JCR Clarivate Analytics JCR

Clarivate Analytics JCR JCR

Impact Factor



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Clarivate Analytics

Impact Factor

Impact Factor Clarivate Analytics Web Web of Science Web of Scienrce Science Citation Index ExpandedSCIE Social Scineces Citation IndexSSCI E SCI DVD Impact Factor SCIE SSCI

Web of ScienceSCIE SSCIClarivate Analytics

Clarivate Analytics 4

1 2 3 4

1 2

3 Regional Journal 20 ImpactFactor 20932 10 10 Editorial Board 2008 Regional Journal

Impact Factor Impact Factor Web of Science Web of Science Impact Factor Impact Factor ImpactFactor ImpactFactor



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ImpactFactor ImpactFactor

Clarivate Analytics Clarivate Analytics Clarivate Analytics 2

Impactfactor

Impact Factor Impact Factor

ImpactFactor Method Guideline

ImpactFactor ImpactFactor

Clarivate Analytics EigenFactor



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