Precision @ K

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A Precision @ K is an information discovery evaluation metric that ...



References

2018

  • (Wikipedia, 2018) ⇒ https://en.wikipedia.org/wiki/Evaluation_measures_(information_retrieval)#Precision Retrieved:2018-6-22.
    • Precision is the fraction of the documents retrieved that are relevant to the user's information need. : [math]\displaystyle{ \mbox{precision}=\frac{|\{\mbox{relevant documents}\}\cap\{\mbox{retrieved documents}\}|}{|\{\mbox{retrieved documents}\}|} }[/math] In binary classification, precision is analogous to positive predictive value. Precision takes all retrieved documents into account. It can also be evaluated at a given cut-off rank, considering only the topmost results returned by the system. This measure is called precision at n or P@n.

      Note that the meaning and usage of "precision" in the field of information retrieval differs from the definition of accuracy and precision within other branches of science and statistics.

2018