Search - recall, precision and ranking
Last few month I’m playing with how FAST Search is working and found interesting information about the problems in searching the right information.
Studies estimate we spend 10%-15% of out time to search necessary information (what correlates to another research that employees spend 50mins per working day to find information)
The relevance of the search consist from 3 parts: recall, precision and ranking
The “catch-22” situation of the search is in “Precision vs recall” battle. High precision means that the exact document found, when high recall means that no document are missed. In other words “recall” measure how well system finds your items, when “precision” filters our what you don’t want. Precision and recall can be calculated by result set.
Thus, returning more documents (encreasing recall) we loose the precision and vice versa. The choice in up to you.