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
675
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
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
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)199910.276
Cites / Doc. (4 years)200010.700
Cites / Doc. (4 years)200111.097
Cites / Doc. (4 years)200211.412
Cites / Doc. (4 years)200311.148
Cites / Doc. (4 years)200411.512
Cites / Doc. (4 years)200511.668
Cites / Doc. (4 years)200611.461
Cites / Doc. (4 years)200711.257
Cites / Doc. (4 years)200810.772
Cites / Doc. (4 years)200910.977
Cites / Doc. (4 years)201011.289
Cites / Doc. (4 years)201111.560
Cites / Doc. (4 years)201211.994
Cites / Doc. (4 years)201311.979
Cites / Doc. (4 years)201411.639
Cites / Doc. (4 years)201511.240
Cites / Doc. (4 years)201610.662
Cites / Doc. (4 years)201710.218
Cites / Doc. (3 years)199910.276
Cites / Doc. (3 years)200010.859
Cites / Doc. (3 years)200111.296
Cites / Doc. (3 years)200211.410
Cites / Doc. (3 years)200311.064
Cites / Doc. (3 years)200411.384
Cites / Doc. (3 years)200511.404
Cites / Doc. (3 years)200611.227
Cites / Doc. (3 years)200710.799
Cites / Doc. (3 years)200810.541
Cites / Doc. (3 years)200910.734
Cites / Doc. (3 years)201010.972
Cites / Doc. (3 years)201111.259
Cites / Doc. (3 years)201211.636
Cites / Doc. (3 years)201311.596
Cites / Doc. (3 years)201411.274
Cites / Doc. (3 years)201510.866
Cites / Doc. (3 years)201610.452
Cites / Doc. (3 years)20179.971
Cites / Doc. (2 years)199910.024
Cites / Doc. (2 years)200010.750
Cites / Doc. (2 years)200110.962
Cites / Doc. (2 years)200211.048
Cites / Doc. (2 years)200310.640
Cites / Doc. (2 years)200410.895
Cites / Doc. (2 years)200510.977
Cites / Doc. (2 years)200610.502
Cites / Doc. (2 years)200710.274
Cites / Doc. (2 years)20089.989
Cites / Doc. (2 years)200910.121
Cites / Doc. (2 years)201010.425
Cites / Doc. (2 years)201110.652
Cites / Doc. (2 years)201210.939
Cites / Doc. (2 years)201310.867
Cites / Doc. (2 years)201410.634
Cites / Doc. (2 years)201510.342
Cites / Doc. (2 years)20169.950
Cites / Doc. (2 years)20179.374
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 Cites19992971
Self Cites20003055
Self Cites20013307
Self Cites20023272
Self Cites20033176
Self Cites20043305
Self Cites20053426
Self Cites20063258
Self Cites20073456
Self Cites20083438
Self Cites20093498
Self Cites20103436
Self Cites20113365
Self Cites20123603
Self Cites20133760
Self Cites20143422
Self Cites20153113
Self Cites20162844
Self Cites20172675
Total Cites199983515
Total Cites200086688
Total Cites200189252
Total Cites200288442
Total Cites200388863
Total Cites200493829
Total Cites200599999
Total Cites2006101899
Total Cites2007104510
Total Cites2008106197
Total Cites2009111471
Total Cites2010118881
Total Cites2011125168
Total Cites2012130683
Total Cites2013130840
Total Cites2014129147
Total Cites2015124518
Total Cites2016114910
Total Cites2017102496
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 document19999.911
External Cites per document200010.476
External Cites per document200110.878
External Cites per document200210.988
External Cites per document200310.668
External Cites per document200410.983
External Cites per document200511.013
External Cites per document200610.868
External Cites per document200710.442
External Cites per document200810.199
External Cites per document200910.397
External Cites per document201010.655
External Cites per document201110.956
External Cites per document201211.315
External Cites per document201311.263
External Cites per document201410.976
External Cites per document201510.595
External Cites per document201610.193
External Cites per document20179.711
Cites per document199910.276
Cites per document200010.859
Cites per document200111.296
Cites per document200211.410
Cites per document200311.064
Cites per document200411.384
Cites per document200511.404
Cites per document200611.227
Cites per document200710.799
Cites per document200810.541
Cites per document200910.734
Cites per document201010.972
Cites per document201111.259
Cites per document201211.636
Cites per document201311.596
Cites per document201411.274
Cites per document201510.866
Cites per document201610.452
Cites per document20179.971
% 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
199925.56
200029.39
200128.49
200226.97
200331.28
200430.99
200532.68
200633.81
200735.66
200836.83
200939.06
201038.14
201138.49
201242.46
201341.56
201443.55
201542.60
201644.80
201745.78
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 documents1999339
Non-citable documents2000451
Non-citable documents2001513
Non-citable documents2002595
Non-citable documents2003603
Non-citable documents2004613
Non-citable documents2005604
Non-citable documents2006634
Non-citable documents2007742
Non-citable documents2008784
Non-citable documents2009932
Non-citable documents20101084
Non-citable documents20111262
Non-citable documents20121356
Non-citable documents20131429
Non-citable documents20141589
Non-citable documents20151659
Non-citable documents20161760
Non-citable documents20171726
Citable documents19998127
Citable documents20007983
Citable documents20017901
Citable documents20027751
Citable documents20038032
Citable documents20048242
Citable documents20058769
Citable documents20069076
Citable documents20079678
Citable documents200810075
Citable documents200910385
Citable documents201010835
Citable documents201111117
Citable documents201211231
Citable documents201311283
Citable documents201411455
Citable documents201511459
Citable documents201610994
Citable documents201710279
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 documents1999582
Uncited documents2000589
Uncited documents2001535
Uncited documents2002534
Uncited documents2003543
Uncited documents2004509
Uncited documents2005556
Uncited documents2006629
Uncited documents2007750
Uncited documents2008748
Uncited documents2009864
Uncited documents2010901
Uncited documents2011953
Uncited documents20121029
Uncited documents20131099
Uncited documents20141211
Uncited documents20151299
Uncited documents20161424
Uncited documents20171383
Cited documents19997884
Cited documents20007845
Cited documents20017879
Cited documents20027812
Cited documents20038092
Cited documents20048346
Cited documents20058817
Cited documents20069081
Cited documents20079670
Cited documents200810111
Cited documents200910453
Cited documents201011018
Cited documents201111426
Cited documents201211558
Cited documents201311613
Cited documents201411833
Cited documents201511819
Cited documents201611330
Cited documents201710622
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