Evaluation of indexing system

This article describes information system and its various components-index file construction, query formulation, and searching. Discusses an indexing system, and brings out the need for its evaluation; Explains the concept of the efficiency of indexing system and discusses factors which control this efficiency; Gives criteria for evaluation; Discusses recall and precision ratios, as also noise ratio, fall out ratio, novelty ratio and exhaustivity and specificity and the impact of each on the efficiency of indexing system ; Mantions also various steps for evaluation