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F-ratio (disambiguation)

F-ratio or f-ratio may refer to:

• f-number, f-ratio, or focal ratio, the ratio of the focal length of an optical system to the diameter of its entrance pupil;
• f-ratio, in oceanography, which relates recycled and total primary production in the surface ocean;
• The F-ratio used in statistics, which relates the variances of independent samples; see F-distribution.