06033538

j

06033538 Ciucci, Davide Temporal dynamics in information tables. Fundam. Inform. 115, No. 1, 57-74 (2012). 2012 Polish Mathematical Society, Warsaw; IOS Press, Amsterdam EN

http://iospress.metapress.com/content/d7438055m525t4l3/fulltext.html

Summary: An information table can change over time in several different ways: objects enter/exit the system, new attributes are considered, etc. As a consequence rough set instruments also change. At first, we recall a classification of dynamic increase of information with respect to three different factors: objects, attributes, values. Then, the corresponding changes in rough sets are discussed. Results about approximations, positive region and generalized decision are given and algorithms to update reducts and rules provided.