Enhanced Affixation Word Stemmer with Stemming Error Reducer to Solve Affxation Stemming Errors

Abstract

Word stemming algorithm (or word stemmer) is an important preprocessing component in the information retrieval and text categorization that aims to reduce derived words to their respective root words. Most of the existing Malay word stemmers adopt rule-based affixes removal method and dictionary lookup to stem affixation words. Despite of many stemming approaches have been proposed in the past research, the existing Malay word stemmers still suffer from affixation stemming errors due to the complexity of Malay morphology. These stemming errors can be classified into over stemming, under stemming, unstem, and special variations and exceptions. Hence this paper presents the enhanced affixation word stemmer that aims to solve these stemming errors. This paper also examined the root causes of these stemming errors in the existing Malay stemmers. The experimental results indicate that the enhanced word stemmerable to stem prefixation, suffixation, confixation and infixation wordswith better stemming accuracy by using enhanced Rule Application Order and Stemming Errors Reducer.