Schubert András, Zsindely Sándor, Glänzel Wolfgang, Braun Tibor (szerk.): A tudományos publikációs tevékenység mutatószámai az MTA természettudományi, műszaki, orvostudományi és agrártudományi kutatóhelyein 1976–1980 (A MTAK Informatikai És Tudományelemzési Sorozata 2., 1982)
VII. FÜGGELÉK - 2. A „Journal Citation Reports" által nyilvántartott folyóiratok „impact factorai"
(4) the sum of citations in 1979 to items published in 1978 and 1977. This is simply the sum of the two previous columns. The next three columns, bracketed under the heading, ' Source items in ', give (1) The number of source items published by the journal in 1978; (2) in 1977; and (3) in both years. The next column, headed 'Impact Factor', gives a figure for the relative frequency with which the journal's 'average article' has been cited. (See Impact Factor under Definitions.) Briefly, the impact factor is the ratio of citations to citable items published: all journals' 1979 citations of 1977 and 1978 items published by journal X, divided by the total number of source items published in 1977 and 1978 by journal X. The next two columns show, respectively, the number of times articles in the journal's 1979 issues were cited in the references of Science Citation Index® , Social Sciences Citation Index® , and Arts & Humanities Citation Index™ source items for the same period; and the number of source items the journal itself published that year. The last column, headed 'Immediacy Index', (see that term under Definitions) is the result of dividing citations of 1979 articles by source items published in 1979. Thus, we see that Acta Anaesthesiologica Scandinavica was cited by SCI/SSCI/A&HCI source journals 753 times in 1979. Of these 753 citations, 230 were to articles published in 1977 and 1978 issues of Acta Anaesthesiologica Scandinavica. In 1978 that journal published 167 source items, in 1977, 87. The impact factor is therefore 230/254, or 0.906. In 1979, Acta Anaesthesiologica Scandinavica published 92 articles, to which there were, during 1979, 32 citations. Thus, the immediacy index is 32/92 or 0.348. It should be remembered that the journals which appear in the Journal Ranking Package include not only SCI® source journals, but also other science journals cited in the SCf/SSCI™ / A&HCI™ data base. Among the journals listed are some 850 clinical, agricultural and engineering journals not indexed by SC/® , but covered by ISI®'s current awareness publications. Current Contents'" /Clinical Practice; Current Contents/Agriculture, Biology & Environmental Sciences ; and Current Contents/Engineering, Technology & Applied Sciences. In most cases, we have been able to supply the information that is needed on items to fill out the entries for cited journals not covered by the SCI. Where we have not, a small bullet (•) appears. There will always be a citation count in the first column unless the journal has never been cited. And a zero in the second to fourth columns under ' Citations in 1979 to ' is a true zero. Zeros in the second group of columns headed ' Source Items In ' usually indicate that the journal is no longer published or is no longer published under that title. For example, Acta Crystallographica was cited 6,417 times in 1979. Of those citations, 16 were supposedly citations of articles published by 'Acta Crystallographica' in 1977 and 1978. As the reader may know, however, the former Acta Crystallographica had in 1972 split into separate A and B sections. Counts for those journals immediately follow the entry for the former title. As shown, 'Acta Crystallographica' published nothing in 1977, 1978, or in 1979, but incomplete citations in 1979 references of some journals failed to identify which of the A or B sections was meant. The original title is still highly cited, but cannot be given either impact factor or immediacy index. Both are given for the A and B sections in the entries below. The journal origin of the 22 incomplete citations can be partially determined by consulting the Cited Journal Package. As an alert for the user, an asterisk following the abbreviation of journals (usually Russian) reminds the user that citation counts for the translated and original versions have been kept separate.
