Scimago Journal & Country Rank

Proceedings of the National Academy of Sciences of the United States of Americaopen access

Country

United States

Universities and research institutions in United States

Subject Area and Category

Publisher

National Academy of Sciences

H-Index

805

Publication type

Journals

ISSN

00278424, 10916490

Coverage

1945-1951, 1961-2021

Information

Homepage

How to publish in this journal

pnas@nas.edu

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. Join the conversation about this journal
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
Multidisciplinary2020Q1
Multidisciplinary2021Q1
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
20205.011
20214.184
Total Documents

Evolution of the number of published documents. All types of documents are considered, including citable and non citable documents.

YearDocuments
19992760
20002643
20012741
20023034
20032846
20043223
20053327
20063372
20073602
20083722
20093967
20104058
20113918
20124139
20134334
20143994
20153727
20163647
20173801
20183697
20193823
20204246
20214131
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)199910.187
Cites / Doc. (4 years)200010.547
Cites / Doc. (4 years)200110.800
Cites / Doc. (4 years)200211.033
Cites / Doc. (4 years)200310.717
Cites / Doc. (4 years)200411.078
Cites / Doc. (4 years)200511.236
Cites / Doc. (4 years)200611.020
Cites / Doc. (4 years)200710.875
Cites / Doc. (4 years)200810.336
Cites / Doc. (4 years)200910.417
Cites / Doc. (4 years)201010.593
Cites / Doc. (4 years)201110.745
Cites / Doc. (4 years)201211.017
Cites / Doc. (4 years)201310.933
Cites / Doc. (4 years)201410.462
Cites / Doc. (4 years)201510.236
Cites / Doc. (4 years)20169.783
Cites / Doc. (4 years)20179.528
Cites / Doc. (4 years)20189.402
Cites / Doc. (4 years)20199.248
Cites / Doc. (4 years)20209.820
Cites / Doc. (4 years)202111.067
Cites / Doc. (3 years)199910.187
Cites / Doc. (3 years)200010.636
Cites / Doc. (3 years)200110.954
Cites / Doc. (3 years)200210.969
Cites / Doc. (3 years)200310.621
Cites / Doc. (3 years)200410.951
Cites / Doc. (3 years)200511.013
Cites / Doc. (3 years)200610.794
Cites / Doc. (3 years)200710.415
Cites / Doc. (3 years)200810.071
Cites / Doc. (3 years)200910.137
Cites / Doc. (3 years)201010.277
Cites / Doc. (3 years)201110.375
Cites / Doc. (3 years)201210.641
Cites / Doc. (3 years)201310.536
Cites / Doc. (3 years)201410.095
Cites / Doc. (3 years)20159.853
Cites / Doc. (3 years)20169.548
Cites / Doc. (3 years)20179.266
Cites / Doc. (3 years)20189.022
Cites / Doc. (3 years)20198.892
Cites / Doc. (3 years)20209.438
Cites / Doc. (3 years)202110.956
Cites / Doc. (2 years)19999.881
Cites / Doc. (2 years)200010.486
Cites / Doc. (2 years)200110.558
Cites / Doc. (2 years)200210.591
Cites / Doc. (2 years)200310.201
Cites / Doc. (2 years)200410.528
Cites / Doc. (2 years)200510.582
Cites / Doc. (2 years)200610.081
Cites / Doc. (2 years)20079.863
Cites / Doc. (2 years)20089.497
Cites / Doc. (2 years)20099.537
Cites / Doc. (2 years)20109.671
Cites / Doc. (2 years)20119.760
Cites / Doc. (2 years)20129.955
Cites / Doc. (2 years)20139.824
Cites / Doc. (2 years)20149.506
Cites / Doc. (2 years)20159.325
Cites / Doc. (2 years)20169.049
Cites / Doc. (2 years)20178.698
Cites / Doc. (2 years)20188.371
Cites / Doc. (2 years)20198.191
Cites / Doc. (2 years)20208.963
Cites / Doc. (2 years)202110.535
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 Cites19993080
Self Cites20003115
Self Cites20013313
Self Cites20023262
Self Cites20033165
Self Cites20043288
Self Cites20053372
Self Cites20063128
Self Cites20073287
Self Cites20083252
Self Cites20093326
Self Cites20103276
Self Cites20113194
Self Cites20123436
Self Cites20133569
Self Cites20143271
Self Cites20152964
Self Cites20162720
Self Cites20172528
Self Cites20182383
Self Cites20192275
Self Cites20202447
Self Cites20212362
Total Cites199984641
Total Cites200087786
Total Cites200190055
Total Cites200289333
Total Cites200389407
Total Cites200494408
Total Cites2005100252
Total Cites2006101421
Total Cites2007103336
Total Cites2008103744
Total Cites2009108425
Total Cites2010116041
Total Cites2011121879
Total Cites2012127086
Total Cites2013127640
Total Cites2014125093
Total Cites2015122838
Total Cites2016115097
Total Cites2017105334
Total Cites2018100822
Total Cites201999101
Total Cites2020106846
Total Cites2021128914
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 document199910.036
External Cites per document200010.609
External Cites per document200110.987
External Cites per document200211.115
External Cites per document200310.756
External Cites per document200411.081
External Cites per document200511.096
External Cites per document200610.920
External Cites per document200710.528
External Cites per document200810.207
External Cites per document200910.390
External Cites per document201010.675
External Cites per document201110.942
External Cites per document201211.292
External Cites per document201311.250
External Cites per document201410.886
External Cites per document201510.697
External Cites per document201610.448
External Cites per document201710.179
External Cites per document20189.900
External Cites per document20199.712
External Cites per document202010.242
External Cites per document202111.946
Cites per document199910.187
Cites per document200010.636
Cites per document200110.954
Cites per document200210.969
Cites per document200310.621
Cites per document200410.951
Cites per document200511.013
Cites per document200610.794
Cites per document200710.415
Cites per document200810.071
Cites per document200910.137
Cites per document201010.277
Cites per document201110.375
Cites per document201210.641
Cites per document201310.536
Cites per document201410.095
Cites per document20159.853
Cites per document20169.548
Cites per document20179.266
Cites per document20189.022
Cites per document20198.892
Cites per document20209.438
Cites per document202110.956
% 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
199926.88
200029.85
200129.15
200227.59
200331.97
200431.62
200533.48
200635.02
200736.48
200837.43
200940.51
201038.81
201139.05
201243.34
201342.50
201444.62
201544.49
201645.93
201745.25
201845.31
201944.86
202045.76
202145.24
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 documents1999182
Non-citable documents2000273
Non-citable documents2001326
Non-citable documents2002400
Non-citable documents2003400
Non-citable documents2004398
Non-citable documents2005372
Non-citable documents2006395
Non-citable documents2007419
Non-citable documents2008456
Non-citable documents2009581
Non-citable documents2010728
Non-citable documents2011900
Non-citable documents2012993
Non-citable documents20131086
Non-citable documents20141200
Non-citable documents20151261
Non-citable documents20161299
Non-citable documents20171268
Non-citable documents20181232
Non-citable documents20191175
Non-citable documents20201128
Non-citable documents20211172
Citable documents19998127
Citable documents20007981
Citable documents20017895
Citable documents20027744
Citable documents20038018
Citable documents20048223
Citable documents20058731
Citable documents20069001
Citable documents20079503
Citable documents20089845
Citable documents200910115
Citable documents201010563
Citable documents201110847
Citable documents201210950
Citable documents201311029
Citable documents201411191
Citable documents201511206
Citable documents201610756
Citable documents201710100
Citable documents20189943
Citable documents20199970
Citable documents202010193
Citable documents202110594
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 documents1999419
Uncited documents2000415
Uncited documents2001357
Uncited documents2002337
Uncited documents2003338
Uncited documents2004307
Uncited documents2005336
Uncited documents2006400
Uncited documents2007436
Uncited documents2008427
Uncited documents2009534
Uncited documents2010572
Uncited documents2011630
Uncited documents2012701
Uncited documents2013781
Uncited documents2014880
Uncited documents2015931
Uncited documents2016987
Uncited documents2017999
Uncited documents20181099
Uncited documents20191134
Uncited documents20201263
Uncited documents20211221
Cited documents19997890
Cited documents20007839
Cited documents20017864
Cited documents20027807
Cited documents20038080
Cited documents20048314
Cited documents20058767
Cited documents20068996
Cited documents20079486
Cited documents20089874
Cited documents200910162
Cited documents201010719
Cited documents201111117
Cited documents201211242
Cited documents201311334
Cited documents201411511
Cited documents201511536
Cited documents201611068
Cited documents201710369
Cited documents201810076
Cited documents201910011
Cited documents202010058
Cited documents202110545
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