F-ratio or f-ratio may refer to: The F-ratio used in statistics, which relates the variances of independent samples; see F-distribution f-ratio (oceanography)...

In probability theory and statistics, the F-distribution or F-ratio, also known as Snedecor's F distribution or the Fisher–Snedecor distribution (after...

Air–fuel ratio (AFR) is the mass ratio of air to a solid, liquid, or gaseous fuel present in a combustion process. The combustion may take place in a...

of the entrance pupil ("clear aperture"). The f-number is also known as the focal ratio, f-ratio, or f-stop, and it is key in determining the depth of...

In oceanic biogeochemistry, the f-ratio is the fraction of total primary production fuelled by nitrate (as opposed to that fuelled by other nitrogen compounds...

An F-test is any statistical test used to compare the variances of two samples or the ratio of variances between multiple samples. The test statistic,...

its means. The equality of three or more ratios, like A:B = C:D = E:F, is called a continued proportion. Ratios are sometimes used with three or even more...

careful adjustment of the O/F ratio may allow higher thrust levels. Once the rocket is away from the launchpad, the engine O/F ratio can be tuned for higher...

In mathematics, two quantities are in the golden ratio if their ratio is the same as the ratio of their sum to the larger of the two quantities. Expressed...

after William F. Sharpe, who developed it in 1966. Since its revision by the original author, William Sharpe, in 1994, the ex-ante Sharpe ratio is defined...