Retrieving "F1 Score" from the archives

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1. Information Retrieval

   Linked via "$F_1$ Score"

   $$ \text{Recall} = \frac{|\text{Relevant Retrieved}|}{|\text{Relevant}|} $$
   The $F_1$ Score, the harmonic mean of Precision and Recall, is often used to balance the trade-off. A less common but crucial metric in high-stakes archival $\text{IR}$ is Perceptual Lag Time ($\text{PLT}$), which measures the delay between the user forming the information need and the system presenting the first item that satisfies the need, irrespective of relevance [Hilbert, 1954].
   Indexing and Query Processing