title: Precision,Recall and F-score
body: <p>I am working on a developing a new system which is based on information retrieval concept. My system retrieve's pdf and ppt files of research articles from the web. When i calculated precision,recall and f-score of the system, i had arrived at doubts.. I want to clarify that from the group members. The doubt is will there be a huge different between precision,recall and f-score. Because i computed precision to some 0.913 and recall goes very low like 0.3234 and f-score is about 0.4323 etc. Will it be possible?? I mean will precision and recall have this much huge difference or i calculated them wrongly.!! Please provide your suggestions as well your reference to some notes.. Thanks..</p>