Braun Tibor, Glänzel Wolfgang, Schubert András: Országok, szakterületek, folyóiratok tudománymetriai mutatószámai 1981-1985 (A MTAK Informatikai És Tudományelemzési Sorozata 6., 1992)

Methodology

A. SCHUBERT, W. GLÄNZEL, T. BRAUN : SCIENTOMETRIC DATAFILES Restricting the evaluation to journal articles, we still have to cope with SCI's annual journal coverage changes. Annually about 10% of the covered titles are changing. The changes are partly due to alterations in the journals themselves (cessation, splitting, title changes etc.), partly decided by the Editorial Board of the SCI database. If indicators concerning to a period of several years are to be built, the possible consequences of inclusion or omission of journals only partially covered in the period in question are to be thoughtfully considered. In our present study, 3926 journal titles occurred at least once in the SCI database during the 1981-1985 period. After correcting for the title changes and some other unambiguous alterations, this number was reduced to 3711. 2649 journals were covered in all the five years of the period. This 71% of the journals contained 94% of the papers and received 98% of the citations in the period under study. Our final decision was to use this fix journal set as the basis of building scientometric indicators for the 1981-1985 period. Ad 2. The SCI database distinguishes the following types of publications as source items: - research articles, reports, technical papers; - reviews, biblographies; - notes; - letters; - meeting abstracts; - book reviews; - corrections, additions; - discussion papers; - editorials; - items about individuals; - chronologies; - proceeding papers; - software reviews. Some statistical data on the distribution of these publication types have recendy been published in a separate "Flash"

9. The main finding was that the first four of the above listed publication types (articles, reviews, notes and letters) deserve the name citable item and no other publication type is relevant in impact oriented evaluations. 6 Scientonietrics 16 (1989)