TY - JFULL AU - Chen Wu and Jingyu Yang PY - 2008/1/ TI - Join and Meet Block Based Default Definite Decision Rule Mining from IDT and an Incremental Algorithm T2 - International Journal of Computer and Information Engineering SP - 4119 EP - 4129 VL - 2 SN - 1307-6892 UR - https://publications.waset.org/pdf/10939 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 24, 2008 N2 - Using maximal consistent blocks of tolerance relation on the universe in incomplete decision table, the concepts of join block and meet block are introduced and studied. Including tolerance class, other blocks such as tolerant kernel and compatible kernel of an object are also discussed at the same time. Upper and lower approximations based on those blocks are also defined. Default definite decision rules acquired from incomplete decision table are proposed in the paper. An incremental algorithm to update default definite decision rules is suggested for effective mining tasks from incomplete decision table into which data is appended. Through an example, we demonstrate how default definite decision rules based on maximal consistent blocks, join blocks and meet blocks are acquired and how optimization is done in support of discernibility matrix and discernibility function in the incomplete decision table. ER -