New figures for a Web-accessible database of the 1,945 basic Japanese kanji, fourth edition.

On the basis of calculations using the latest lexical database produced by Amano and Kondo (2000), the fourth edition of a Web-accessible database of characteristics of the 1,945 basic Japanese kanji was produced by including the mathematical concepts of entropy, redundancy, and symmetry and by replacing selected indexes found in previous editions (Tamaoka, Kirsner, Yanase, Miyaoka, & Kawakami, 2002). The kanji database in the fourth edition introduces seven new figures for kanji characteristics: (1) printed frequency, (2) lexical productivity, (3) accumulative lexical productivity, (4) symmetry for lexical productivity, (5) entropy, (6) redundancy, and (7) numbers of meanings for On-readings and Kun-readings. The file of the fourth edition of the kanji database may be downloaded from the Psychonomic Society Web archive, http://www.psychonomics.org/archive/.