Scimago Journal & Country Rank

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

CountryUnited States
604
H Index
Subject Area and CategoryMultidisciplinary
Multidisciplinary
PublisherNational Academy of Sciences
Publication typeJournals
ISSN00278424, 10916490
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. (source)
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
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
19998.188
20007.707
20017.119
20027.122
20036.914
20046.937
20056.721
20066.684
20076.752
20086.875
20096.889
20106.758
20116.759
20126.789
20136.967
20146.826
20156.883
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)199910.156
Cites / Doc. (4 years)200010.612
Cites / Doc. (4 years)200111.008
Cites / Doc. (4 years)200211.315
Cites / Doc. (4 years)200311.063
Cites / Doc. (4 years)200411.432
Cites / Doc. (4 years)200511.574
Cites / Doc. (4 years)200611.340
Cites / Doc. (4 years)200711.127
Cites / Doc. (4 years)200810.680
Cites / Doc. (4 years)200910.851
Cites / Doc. (4 years)201011.125
Cites / Doc. (4 years)201111.413
Cites / Doc. (4 years)201211.740
Cites / Doc. (4 years)201311.604
Cites / Doc. (4 years)201411.165
Cites / Doc. (4 years)201510.190
Cites / Doc. (3 years)199910.156
Cites / Doc. (3 years)200010.770
Cites / Doc. (3 years)200111.206
Cites / Doc. (3 years)200211.312
Cites / Doc. (3 years)200310.977
Cites / Doc. (3 years)200411.308
Cites / Doc. (3 years)200511.310
Cites / Doc. (3 years)200611.110
Cites / Doc. (3 years)200710.672
Cites / Doc. (3 years)200810.446
Cites / Doc. (3 years)200910.609
Cites / Doc. (3 years)201010.813
Cites / Doc. (3 years)201111.110
Cites / Doc. (3 years)201211.387
Cites / Doc. (3 years)201311.243
Cites / Doc. (3 years)201410.801
Cites / Doc. (3 years)20159.852
Cites / Doc. (2 years)19999.911
Cites / Doc. (2 years)200010.656
Cites / Doc. (2 years)200110.872
Cites / Doc. (2 years)200210.949
Cites / Doc. (2 years)200310.554
Cites / Doc. (2 years)200410.817
Cites / Doc. (2 years)200510.884
Cites / Doc. (2 years)200610.393
Cites / Doc. (2 years)200710.154
Cites / Doc. (2 years)20089.901
Cites / Doc. (2 years)200910.007
Cites / Doc. (2 years)201010.268
Cites / Doc. (2 years)201110.504
Cites / Doc. (2 years)201210.703
Cites / Doc. (2 years)201310.539
Cites / Doc. (2 years)201410.173
Cites / Doc. (2 years)20159.375
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 Cites19992702
Self Cites20002856
Self Cites20013289
Self Cites20023271
Self Cites20033175
Self Cites20043302
Self Cites20053421
Self Cites20063250
Self Cites20073451
Self Cites20083432
Self Cites20093496
Self Cites20103429
Self Cites20113363
Self Cites20123540
Self Cites20133747
Self Cites20143407
Self Cites20153044
Total Cites199982545
Total Cites200085976
Total Cites200188541
Total Cites200287682
Total Cites200388171
Total Cites200493212
Total Cites200599185
Total Cites2006100842
Total Cites2007103317
Total Cites2008105299
Total Cites2009110253
Total Cites2010117214
Total Cites2011123557
Total Cites2012128000
Total Cites2013127019
Total Cites2014123899
Total Cites2015113075
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 document19999.823
External Cites per document200010.412
External Cites per document200110.790
External Cites per document200210.890
External Cites per document200310.582
External Cites per document200410.907
External Cites per document200510.919
External Cites per document200610.752
External Cites per document200710.316
External Cites per document200810.106
External Cites per document200910.273
External Cites per document201010.497
External Cites per document201110.808
External Cites per document201211.072
External Cites per document201310.911
External Cites per document201410.504
External Cites per document20159.587
Cites per document199910.156
Cites per document200010.770
Cites per document200111.206
Cites per document200211.312
Cites per document200310.977
Cites per document200411.308
Cites per document200511.310
Cites per document200611.110
Cites per document200710.672
Cites per document200810.446
Cites per document200910.609
Cites per document201010.813
Cites per document201111.110
Cites per document201211.387
Cites per document201311.243
Cites per document201410.801
Cites per document20159.852
% 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
199923.32
200029.27
200128.49
200226.97
200331.28
200430.98
200532.67
200633.79
200735.62
200836.79
200939.03
201038.09
201138.41
201241.77
201341.45
201443.33
201542.88
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 documents1999345
Non-citable documents2000454
Non-citable documents2001515
Non-citable documents2002596
Non-citable documents2003603
Non-citable documents2004612
Non-citable documents2005604
Non-citable documents2006635
Non-citable documents2007743
Non-citable documents2008786
Non-citable documents2009935
Non-citable documents20101091
Non-citable documents20111271
Non-citable documents20121361
Non-citable documents20131426
Non-citable documents20141583
Non-citable documents20151655
Citable documents19998128
Citable documents20007983
Citable documents20017901
Citable documents20027751
Citable documents20038032
Citable documents20048243
Citable documents20058770
Citable documents20069077
Citable documents20079681
Citable documents200810080
Citable documents200910392
Citable documents201010840
Citable documents201111121
Citable documents201211241
Citable documents201311298
Citable documents201411471
Citable documents201511477
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 documents1999594
Uncited documents2000598
Uncited documents2001542
Uncited documents2002539
Uncited documents2003551
Uncited documents2004517
Uncited documents2005564
Uncited documents2006646
Uncited documents2007765
Uncited documents2008765
Uncited documents2009890
Uncited documents2010927
Uncited documents2011993
Uncited documents20121064
Uncited documents20131138
Uncited documents20141266
Uncited documents20151403
Cited documents19997879
Cited documents20007839
Cited documents20017874
Cited documents20027808
Cited documents20038084
Cited documents20048338
Cited documents20058810
Cited documents20069066
Cited documents20079659
Cited documents200810101
Cited documents200910437
Cited documents201011004
Cited documents201111399
Cited documents201211538
Cited documents201311586
Cited documents201411788
Cited documents201511729
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