F-measure

A metric that combines correctness (precision) and sensitivity (recall) into a single balanced score, calculated as the harmonic mean of the two values. In accessibility evaluation research, the F-measure provides a single number representing the overall effectiveness of an evaluation method, balancing the trade-off between finding all real problems (sensitivity) and avoiding false positives (correctness). Values range from 0 to 1, with higher values indicating better performance. The F-measure is particularly useful when comparing different accessibility evaluation methods or benchmarking evaluator performance.