What the F-measure doesn't measure: Features, Flaws, Fallacies and Fixes
David M W Powers · arXiv (Cornell University) · 2015
The F-measure or F-score is one of the most commonly used single number measures in Information Retrieval, Natural Language Processing and Machine Learning, but it is based on a mistake, and the flawed assumptions render it unsuitable for use in most contexts! Fortunately, there are better alternatives.