Limitations As Goals
There are other parameters and strategies for performance metric of information retrieval system. In particular, for web document retrieval, if the user's objectives are not clear, the precision and recall can't be optimized. As summarized by Lopresti,
- "Browsing is a comfortable and powerful paradigm (the serendipity effect).
- Search results don't have to be very good.
- Recall? Not important (as long as you get at least some good hits).
- Precision? Not important (as long as at least some of the hits on the first page you return are good)."
Read more about this topic: Precision And Recall
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