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PNAS is one of the world"s most-cited multidisciplinary scientific serials. Since its establishment in 1914, it continues to publish cutting-edge [...]

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)

SJR indicator vs. Cites per Doc (2y)

The SJR indicator 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. Cites per Doc. (2y) measures the scientific impact of an average article published in the journal, it is computed using the same formula that journal impact factor ™ (Thomson Reuters).

Citation vs. Self-Citation

Evolution of the total number of citations and journal's self-citations received by a journal's published documents during the three previous years.

Cites per Document vs. External Cites per Document

Evolution of the number of total cites per document and external cites per document (i.e. journal self-citations removed) received by a journal's published documents during the three previous years.

Cites per Document in 2, 3 and 4 years windows

Evolution of Citations per Document to a journal's published documents during the two, three and four previous years. The two years line is equivalent to journal impact factor ™ (Thomson Reuters) metric.

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.

Journal's Citable vs. 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.

Journal's Cited vs. 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.

Indicators	1999	2000	2001	2002	2003	2004	2005	2006	2007	2008	2009	2010	2011
SJR	6,928	6,596	6,029	5,994	5,734	5,660	5,479	5,282	5,309	5,391	5,383	5,278	5,350
Total Documents	2.830	2.702	2.815	3.118	2.922	3.334	3.456	3.634	3.776	3.919	4.239	4.237	4.129
Total Docs. (3years)	8.473	8.437	8.416	8.347	8.635	8.855	9.374	9.712	10.424	10.866	11.329	11.934	12.395
Total References	102.016	97.241	103.052	112.507	107.512	121.186	127.161	132.552	142.937	138.933	151.256	154.834	153.934
Total Cites (3years)	83.048	86.173	87.661	87.249	86.749	92.210	96.445	96.681	98.906	100.902	104.440	110.113	114.859
Self Cites (3years)	3.027	3.075	3.294	3.272	3.175	3.302	3.421	3.250	3.451	3.432	3.496	3.429	3.364
Citable Docs. (3years)	8.127	7.981	7.900	7.750	8.024	8.235	8.754	9.065	9.668	10.072	10.385	10.835	11.118
Cites / Doc. (4years)	10,22	10,63	10,90	11,26	10,88	11,31	11,24	10,85	10,62	10,20	10,25	10,41	10,56
Cites / Doc. (3years)	10,22	10,80	11,10	11,26	10,81	11,20	11,02	10,67	10,23	10,02	10,06	10,16	10,33
Cites / Doc. (2years)	9,98	10,68	10,77	10,90	10,41	10,72	10,65	10,04	9,80	9,55	9,54	9,74	9,82
References / Doc.	36,05	35,99	36,61	36,08	36,79	36,35	36,79	36,48	37,85	35,45	35,68	36,54	37,28
Cited Docs.	7.879	7.837	7.867	7.803	8.075	8.334	8.794	9.040	9.635	10.074	10.407	10.953	11.324
Uncited Docs.	594	600	549	544	560	521	580	672	789	792	922	981	1.071
% International Collaboration	26,04	29,46	28,60	27,29	31,28	31,16	32,70	33,79	35,62	36,77	39,09	38,16	38,39