International Journal of Computing Science and Information Technology (IJCSIT)
Frequent itemset mining is an important data mining task to discover the hidden, interesting pattern of items in the database. The rare itemsets are those items which appear infrequently in the database. Sometimes rare itemsets are more important as they carry useful information which frequent patterns may not give. Rare itemset appear only when threshold is set to very low. Rare itemsets are also important in finding associations between infrequently purchased retail items, analysis of biomedical data as rare patterns help the doctors to find the disease with rare set of symptoms. Rare itemset mining is a challenging task.