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Proceedings of the National Academy of Sciences of the United States of America

Country United States  - SIR icon
737
H Index
Subject Area and CategoryMultidisciplinary
Multidisciplinary
Publisher National Academy of Sciences
Publication typeJournals
ISSN10916490, 00278424
Coverage1945-1951, 1961-2020
Scope PNAS publishes research reports, Brief Reports, Letters, Front Matter magazine content, Commentaries, Perspectives, and Colloquium Papers. In accordance with the guiding principles established by George Ellery Hale in 1914, PNAS also publishes brief first announcements of NAS members' and foreign associates' more important contributions to research and of work that appears to a member to be of particular importance. All submissions are evaluated by a member of the Editorial Board prior to acceptance. PNAS is a general science journal, and all papers should be intelligible to a broad scientific audience.

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Quartiles

The set of journals have been ranked according to their SJR and divided into four equal groups, four quartiles. Q1 (green) comprises the quarter of the journals with the highest values, Q2 (yellow) the second highest values, Q3 (orange) the third highest values and Q4 (red) the lowest values.

CategoryYearQuartile
Multidisciplinary1999Q1
Multidisciplinary2000Q1
Multidisciplinary2001Q1
Multidisciplinary2002Q1
Multidisciplinary2003Q1
Multidisciplinary2004Q1
Multidisciplinary2005Q1
Multidisciplinary2006Q1
Multidisciplinary2007Q1
Multidisciplinary2008Q1
Multidisciplinary2009Q1
Multidisciplinary2010Q1
Multidisciplinary2011Q1
Multidisciplinary2012Q1
Multidisciplinary2013Q1
Multidisciplinary2014Q1
Multidisciplinary2015Q1
Multidisciplinary2016Q1
Multidisciplinary2017Q1
Multidisciplinary2018Q1
Multidisciplinary2019Q1
SJR

The SJR is a size-independent prestige indicator that ranks journals by their 'average prestige per article'. It is based on the idea that 'all citations are not created equal'. SJR is a measure of scientific influence of journals that accounts for both the number of citations received by a journal and the importance or prestige of the journals where such citations come from It measures the scientific influence of the average article in a journal, it expresses how central to the global scientific discussion an average article of the journal is.

YearSJR
19998.520
20007.927
20017.189
20027.281
20037.129
20047.197
20056.940
20066.849
20076.867
20087.034
20097.025
20106.898
20116.864
20126.868
20137.073
20146.898
20156.814
20166.576
20176.092
20185.601
20195.165
Citations per document

This indicator counts the number of citations received by documents from a journal and divides them by the total number of documents published in that journal. The chart shows the evolution of the average number of times documents published in a journal in the past two, three and four years have been cited in the current year. The two years line is equivalent to journal impact factor ™ (Thomson Reuters) metric.

Cites per documentYearValue
Cites / Doc. (4 years)199910.304
Cites / Doc. (4 years)200010.731
Cites / Doc. (4 years)200111.152
Cites / Doc. (4 years)200211.486
Cites / Doc. (4 years)200311.222
Cites / Doc. (4 years)200411.621
Cites / Doc. (4 years)200511.828
Cites / Doc. (4 years)200611.630
Cites / Doc. (4 years)200711.570
Cites / Doc. (4 years)200811.021
Cites / Doc. (4 years)200911.334
Cites / Doc. (4 years)201011.640
Cites / Doc. (4 years)201111.909
Cites / Doc. (4 years)201212.362
Cites / Doc. (4 years)201312.356
Cites / Doc. (4 years)201411.926
Cites / Doc. (4 years)201511.633
Cites / Doc. (4 years)201611.208
Cites / Doc. (4 years)201710.973
Cites / Doc. (4 years)201810.743
Cites / Doc. (4 years)201910.503
Cites / Doc. (3 years)199910.304
Cites / Doc. (3 years)200010.888
Cites / Doc. (3 years)200111.352
Cites / Doc. (3 years)200211.486
Cites / Doc. (3 years)200311.133
Cites / Doc. (3 years)200411.494
Cites / Doc. (3 years)200511.565
Cites / Doc. (3 years)200611.407
Cites / Doc. (3 years)200711.129
Cites / Doc. (3 years)200810.824
Cites / Doc. (3 years)200911.108
Cites / Doc. (3 years)201011.302
Cites / Doc. (3 years)201111.604
Cites / Doc. (3 years)201211.986
Cites / Doc. (3 years)201311.940
Cites / Doc. (3 years)201411.563
Cites / Doc. (3 years)201511.225
Cites / Doc. (3 years)201610.987
Cites / Doc. (3 years)201710.698
Cites / Doc. (3 years)201810.299
Cites / Doc. (3 years)201910.109
Cites / Doc. (2 years)199910.050
Cites / Doc. (2 years)200010.774
Cites / Doc. (2 years)200111.017
Cites / Doc. (2 years)200211.119
Cites / Doc. (2 years)200310.702
Cites / Doc. (2 years)200411.012
Cites / Doc. (2 years)200511.117
Cites / Doc. (2 years)200610.677
Cites / Doc. (2 years)200710.641
Cites / Doc. (2 years)200810.293
Cites / Doc. (2 years)200910.433
Cites / Doc. (2 years)201010.758
Cites / Doc. (2 years)201110.975
Cites / Doc. (2 years)201211.234
Cites / Doc. (2 years)201311.208
Cites / Doc. (2 years)201410.896
Cites / Doc. (2 years)201510.678
Cites / Doc. (2 years)201610.467
Cites / Doc. (2 years)201710.028
Cites / Doc. (2 years)20189.553
Cites / Doc. (2 years)20199.351
Total Cites 
Self-Cites

Evolution of the total number of citations and journal's self-citations received by a journal's published documents during the three previous years.
Journal Self-citation is defined as the number of citation from a journal citing article to articles published by the same journal.

CitesYearValue
Self Cites19993083
Self Cites20003120
Self Cites20013318
Self Cites20023279
Self Cites20033186
Self Cites20043320
Self Cites20053441
Self Cites20063275
Self Cites20073466
Self Cites20083424
Self Cites20093498
Self Cites20103437
Self Cites20113365
Self Cites20123603
Self Cites20133760
Self Cites20143421
Self Cites20153115
Self Cites20162847
Self Cites20172679
Self Cites20182507
Self Cites20192440
Total Cites199983744
Total Cites200086894
Total Cites200189634
Total Cites200288962
Total Cites200389290
Total Cites200494529
Total Cites2005101013
Total Cites2006102720
Total Cites2007105813
Total Cites2008106593
Total Cites2009112380
Total Cites2010119414
Total Cites2011125913
Total Cites2012131294
Total Cites2013131739
Total Cites2014129460
Total Cites2015125903
Total Cites2016118334
Total Cites2017108216
Total Cites2018102600
Total Cites2019101087
External Cites per Doc 
Cites per Doc

Evolution of the number of total citation per document and external citation per document (i.e. journal self-citations removed) received by a journal's published documents during the three previous years. External citations are calculated by subtracting the number of self-citations from the total number of citations received by the journal’s documents.

CitesYearValue
External Cites per document19999.925
External Cites per document200010.497
External Cites per document200110.932
External Cites per document200211.063
External Cites per document200310.736
External Cites per document200411.091
External Cites per document200511.172
External Cites per document200611.043
External Cites per document200710.764
External Cites per document200810.476
External Cites per document200910.762
External Cites per document201010.976
External Cites per document201111.294
External Cites per document201211.657
External Cites per document201311.600
External Cites per document201411.258
External Cites per document201510.948
External Cites per document201610.723
External Cites per document201710.433
External Cites per document201810.047
External Cites per document20199.865
Cites per document199910.304
Cites per document200010.888
Cites per document200111.352
Cites per document200211.486
Cites per document200311.133
Cites per document200411.494
Cites per document200511.565
Cites per document200611.407
Cites per document200711.129
Cites per document200810.824
Cites per document200911.108
Cites per document201011.302
Cites per document201111.604
Cites per document201211.986
Cites per document201311.940
Cites per document201411.563
Cites per document201511.225
Cites per document201610.987
Cites per document201710.698
Cites per document201810.299
Cites per document201910.109
% International Collaboration

International Collaboration accounts for the articles that have been produced by researchers from several countries. The chart shows the ratio of a journal's documents signed by researchers from more than one country; that is including more than one country address.

YearInternational Collaboration
199926.26
200029.40
200128.39
200226.94
200331.28
200430.99
200532.68
200633.84
200735.70
200836.83
200939.09
201038.15
201138.54
201242.47
201341.57
201443.60
201542.56
201644.77
201744.98
201844.91
201944.83
Citable documents 
Non-citable documents

Not every article in a journal is considered primary research and therefore "citable", this chart shows the ratio of a journal's articles including substantial research (research articles, conference papers and reviews) in three year windows vs. those documents other than research articles, reviews and conference papers.

DocumentsYearValue
Non-citable documents1999337
Non-citable documents2000451
Non-citable documents2001516
Non-citable documents2002599
Non-citable documents2003613
Non-citable documents2004630
Non-citable documents2005639
Non-citable documents2006705
Non-citable documents2007912
Non-citable documents20081007
Non-citable documents20091196
Non-citable documents20101349
Non-citable documents20111527
Non-citable documents20121629
Non-citable documents20131672
Non-citable documents20141844
Non-citable documents20151896
Non-citable documents20161987
Non-citable documents20171892
Non-citable documents20181822
Non-citable documents20191653
Citable documents19998127
Citable documents20007981
Citable documents20017896
Citable documents20027745
Citable documents20038020
Citable documents20048224
Citable documents20058734
Citable documents20069005
Citable documents20079508
Citable documents20089848
Citable documents200910117
Citable documents201010566
Citable documents201110851
Citable documents201210954
Citable documents201311033
Citable documents201411196
Citable documents201511216
Citable documents201610770
Citable documents201710116
Citable documents20189962
Citable documents201910000
Cited documents 
Uncited documents

Ratio of a journal's items, grouped in three years windows, that have been cited at least once vs. those not cited during the following year.

DocumentsYearValue
Uncited documents1999572
Uncited documents2000581
Uncited documents2001528
Uncited documents2002528
Uncited documents2003535
Uncited documents2004502
Uncited documents2005547
Uncited documents2006622
Uncited documents2007742
Uncited documents2008737
Uncited documents2009853
Uncited documents2010889
Uncited documents2011945
Uncited documents20121021
Uncited documents20131079
Uncited documents20141196
Uncited documents20151277
Uncited documents20161398
Uncited documents20171338
Uncited documents20181431
Uncited documents20191386
Cited documents19997892
Cited documents20007851
Cited documents20017884
Cited documents20027816
Cited documents20038098
Cited documents20048352
Cited documents20058826
Cited documents20069088
Cited documents20079678
Cited documents200810118
Cited documents200910460
Cited documents201011026
Cited documents201111433
Cited documents201211562
Cited documents201311626
Cited documents201411844
Cited documents201511835
Cited documents201611359
Cited documents201710670
Cited documents201810353
Cited documents201910267
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