Scimago Journal & Country Rank

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

Country United States  - SIR icon SIR Ranking of United States
699
H Index
Subject Area and CategoryMultidisciplinary
Multidisciplinary
PublisherNational Academy of Sciences
Publication typeJournals
ISSN10916490, 00278424
Coverage1949-1951, 1961-ongoing
Scope PNAS is one of the world"s most-cited multidisciplinary scientific serials. Since its establishment in 1914, it continues to publish cutting-edge research reports, commentaries, reviews, perspectives, colloquium papers, and actions of the Academy. Coverage in PNAS spans the biological, physical, and social sciences. PNAS is published weekly in print, and daily online in PNAS Early Edition. The PNAS impact factor is 9.38 and the Eigenfactor is 1.7 for 2008. PNAS is available by subscription.

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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
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
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)200010.738
Cites / Doc. (4 years)200111.153
Cites / Doc. (4 years)200211.487
Cites / Doc. (4 years)200311.225
Cites / Doc. (4 years)200411.584
Cites / Doc. (4 years)200511.778
Cites / Doc. (4 years)200610.892
Cites / Doc. (4 years)200710.572
Cites / Doc. (4 years)200810.045
Cites / Doc. (4 years)200910.316
Cites / Doc. (4 years)201011.408
Cites / Doc. (4 years)201111.595
Cites / Doc. (4 years)201212.053
Cites / Doc. (4 years)201312.060
Cites / Doc. (4 years)201411.724
Cites / Doc. (4 years)201511.343
Cites / Doc. (4 years)201610.876
Cites / Doc. (4 years)201710.671
Cites / Doc. (4 years)201810.395
Cites / Doc. (3 years)199910.304
Cites / Doc. (3 years)200010.895
Cites / Doc. (3 years)200111.348
Cites / Doc. (3 years)200211.484
Cites / Doc. (3 years)200311.136
Cites / Doc. (3 years)200411.459
Cites / Doc. (3 years)200511.510
Cites / Doc. (3 years)200610.661
Cites / Doc. (3 years)200710.139
Cites / Doc. (3 years)20089.828
Cites / Doc. (3 years)200910.070
Cites / Doc. (3 years)201011.071
Cites / Doc. (3 years)201111.301
Cites / Doc. (3 years)201211.687
Cites / Doc. (3 years)201311.671
Cites / Doc. (3 years)201411.354
Cites / Doc. (3 years)201510.968
Cites / Doc. (3 years)201610.664
Cites / Doc. (3 years)201710.417
Cites / Doc. (3 years)201810.017
Cites / Doc. (2 years)199910.049
Cites / Doc. (2 years)200010.782
Cites / Doc. (2 years)200111.008
Cites / Doc. (2 years)200211.116
Cites / Doc. (2 years)200310.702
Cites / Doc. (2 years)200410.972
Cites / Doc. (2 years)200511.065
Cites / Doc. (2 years)20069.949
Cites / Doc. (2 years)20079.640
Cites / Doc. (2 years)20089.299
Cites / Doc. (2 years)20099.449
Cites / Doc. (2 years)201010.552
Cites / Doc. (2 years)201110.694
Cites / Doc. (2 years)201210.984
Cites / Doc. (2 years)201310.938
Cites / Doc. (2 years)201410.710
Cites / Doc. (2 years)201510.439
Cites / Doc. (2 years)201610.160
Cites / Doc. (2 years)20179.800
Cites / Doc. (2 years)20189.346
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 Cites19993017
Self Cites20003095
Self Cites20013318
Self Cites20023279
Self Cites20033186
Self Cites20043320
Self Cites20053441
Self Cites20063160
Self Cites20073304
Self Cites20083116
Self Cites20093038
Self Cites20103203
Self Cites20113179
Self Cites20123493
Self Cites20133762
Self Cites20143422
Self Cites20153115
Self Cites20162846
Self Cites20172679
Self Cites20182459
Total Cites199983743
Total Cites200086988
Total Cites200189685
Total Cites200289032
Total Cites200389454
Total Cites200494443
Total Cites2005100921
Total Cites200696749
Total Cites200796856
Total Cites200896327
Total Cites200999530
Total Cites2010111768
Total Cites2011118946
Total Cites2012126984
Total Cites2013131616
Total Cites2014130041
Total Cites2015125697
Total Cites2016117236
Total Cites2017107041
Total Cites2018100655
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 document19999.933
External Cites per document200010.508
External Cites per document200110.928
External Cites per document200211.061
External Cites per document200310.739
External Cites per document200411.056
External Cites per document200511.118
External Cites per document200610.313
External Cites per document20079.793
External Cites per document20089.510
External Cites per document20099.762
External Cites per document201010.753
External Cites per document201110.999
External Cites per document201211.366
External Cites per document201311.338
External Cites per document201411.056
External Cites per document201510.697
External Cites per document201610.405
External Cites per document201710.156
External Cites per document20189.773
Cites per document199910.304
Cites per document200010.895
Cites per document200111.348
Cites per document200211.484
Cites per document200311.136
Cites per document200411.459
Cites per document200511.510
Cites per document200610.661
Cites per document200710.139
Cites per document20089.828
Cites per document200910.070
Cites per document201011.071
Cites per document201111.301
Cites per document201211.687
Cites per document201311.671
Cites per document201411.354
Cites per document201510.968
Cites per document201610.664
Cites per document201710.417
Cites per document201810.017
% 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
199925.83
200029.41
200128.50
200226.97
200331.28
200430.99
200532.68
200633.76
200735.61
200836.98
200938.84
201038.15
201138.50
201242.49
201341.55
201443.62
201542.53
201644.62
201745.38
201845.83
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 documents2000449
Non-citable documents2001512
Non-citable documents2002594
Non-citable documents2003602
Non-citable documents2004612
Non-citable documents2005605
Non-citable documents2006635
Non-citable documents2007727
Non-citable documents2008763
Non-citable documents2009889
Non-citable documents20101008
Non-citable documents20111193
Non-citable documents20121309
Non-citable documents20131430
Non-citable documents20141589
Non-citable documents20151660
Non-citable documents20161774
Non-citable documents20171754
Non-citable documents20181715
Citable documents19998127
Citable documents20007984
Citable documents20017903
Citable documents20027753
Citable documents20038033
Citable documents20048242
Citable documents20058768
Citable documents20069075
Citable documents20079553
Citable documents20089801
Citable documents20099884
Citable documents201010096
Citable documents201110525
Citable documents201210865
Citable documents201311277
Citable documents201411453
Citable documents201511460
Citable documents201610994
Citable documents201710276
Citable documents201810048
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 documents1999575
Uncited documents2000583
Uncited documents2001533
Uncited documents2002533
Uncited documents2003538
Uncited documents2004502
Uncited documents2005552
Uncited documents2006650
Uncited documents2007770
Uncited documents2008760
Uncited documents2009853
Uncited documents2010827
Uncited documents2011894
Uncited documents2012986
Uncited documents20131085
Uncited documents20141201
Uncited documents20151286
Uncited documents20161419
Uncited documents20171362
Uncited documents20181434
Cited documents19997889
Cited documents20007850
Cited documents20017882
Cited documents20027814
Cited documents20038097
Cited documents20048352
Cited documents20058821
Cited documents20069060
Cited documents20079510
Cited documents20089804
Cited documents20099920
Cited documents201010277
Cited documents201110824
Cited documents201211188
Cited documents201311622
Cited documents201411841
Cited documents201511834
Cited documents201611349
Cited documents201710668
Cited documents201810329
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