F1 score

In statistical analysis of binary classification, the F₁ score (also F-score or F-measure) is a measure of a test's accuracy. It considers both the precision p and the recall r of the test to compute the score: p is the number of correct positive results divided by the number of all positive results, and r is the number of correct positive results divided by the number of positive results that should have been returned. The F₁ score can be interpreted as a weighted average of the precision and recall, where an F₁ score reaches its best value at 1 and worst at 0.

The traditional F-measure or balanced F-score (F₁ score) is the harmonic mean of precision and recall:

The general formula for positive real β is:

The formula in terms of Type I and type II errors:

Two other commonly used F measures are the measure, which weights recall higher than precision, and the measure, which puts more emphasis on precision than recall.

The F-measure was derived so that "measures the effectiveness of retrieval with respect to a user who attaches β times as much importance to recall as precision". It is based on Van Rijsbergen's effectiveness measure

Score

Score or scorer may refer to:

Business

Mathematics

Media and arts

Score (film)

Score is an American adult film film directed by Radley Metzger that was one of the first films to explore bisexual relationships. It was part of the brief porn chic fad in the early 1970s that also included Behind the Green Door, The Devil in Miss Jones and Deep Throat. The film was based on an off-Broadway stage play that ran for 23 performances at the Martinique Theatre from October 28 through November 15, 1971 and that featured Sylvester Stallone in a brief role (as telephone repairman Mike). The theatrical version of Score was written by Jerry Douglas, who later became a mainstream screenwriter. It was set in a shabby Queens tenement, while the film was set in an elegant, mythical land and sported a relatively high budget for an independent film of that era.

It has been released in both soft-core and hard-core versions. One DVD release, a soft-core version, shows a renewed copyright date of 1976 (all prints featuring the 1976 copyright are the director's approved, edited version), but the film itself was actually released in the United States in December 1973. Hardcore prints, including full-frontal male nudity and fellatio, run 91 minutes, while the ubiquitous soft-core prints were released in an 84-minute format. First Run Pictures marketed the original hardcore version on videocassette, though it was a limited release available by special mail order only. These extremely rare prints occasionally surface on eBay. The hard-core version is now available on DVD and Blu-Ray.

Score (sport)

In sport, score is a quantitative measure of the relative performance of opponents in a sporting discipline. Score is usually measured in the abstract unit of points, and events in the competition can raise or lower the score of the involved parties. Most games with score use it as a quantitative indicator of success in the game, and in competition, a goal is often made of attaining a better score than one's opponents in order to win.

In team sport, the most common point metric is the "goal" or "score". Goals are accrued by the respective teams, and the match score represents the total score accrued by each team. For example, in association football and hockey goals are achieved by putting the ball in the opposing team's net. Other team sports like rugby, baseball and cricket have more complicated scoring procedures. The winning team is that which has recorded the best score, usually the team with the higher total score; a draw or tie is a result in which the competing teams record an equal score.