抄録
In recent years, research evaluation is becoming one of the major topics of governmental science policy. Along with this trend, citation analyses attract great attention as a tool for quantitative measure of quality of research output.
We report some results of an analysis on the characteristics of citations in academic disciplines, based on the ISI citation statistic database : National Citation Report (NCR). This database contains bibliographies of articles written by authors affiliating to Japanese institutes from January 1981 to June 1997,with yearly citation counts.
First, we analyze frequency distributions of citations by academic disciplines, and then investigate changes of citation counts per article through the years after the publication. Finally, we classify all disciplines into four types by the two indices : number of papers and cited times per article.
