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Topics referred to by the same term
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)
F-ratio
Continuous probability distribution
In probability theory and statistics, the F-distribution or F-ratio, also known as Snedecor's F distribution or the Fisher–Snedecor distribution (after
F-distribution
Measure of lens speed
An f-number is a measure of the light-gathering ability of an optical system such as a camera lens. It is defined as the ratio of the system's focal length
F-number
Mass ratio of air to a fuel
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
Air–fuel_ratio
Chemical or mixture used in a rocket engine
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
Rocket_propellant
In oceanic biogeochemistry, the fraction of total primary production fuelled by nitrate
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
F-ratio_(oceanography)
Number, approximately 1.618
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
Golden_ratio
Formula for measuring financial risk
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
Sharpe_ratio
Anaerobic respiration process by microbes
reduction to ammonium and denitrification alters the accuracy of f-ratio calculations. The f-ratio is used to quantify the efficiency of the biological pump
Dissimilatory nitrate reduction to ammonium
Dissimilatory_nitrate_reduction_to_ammonium
Statistical hypothesis test
An F-test is a statistical test that compares variances. It is used to determine if the variances of two samples, or if the ratios of variances among
F-test
Source of error in statistics
in a misspecified F-ratio. In practice, incorrect F-ratios for statistical tests of fixed effects often arise from a default F-ratio that is formed over
Pseudoreplication
Ratio in photography of key light to fill light
lighting ratio formula — (800 + 200):200 = 1000 / 200 = 5 : 1. The ratio can be determined in relation to F stops since each increase in f-stop is equal
Lighting_ratio
Concept in financial risk modeling
The Omega ratio is a risk-return performance measure of an investment asset, portfolio, or strategy. It was devised by Con Keating and William F. Shadwick
Omega_ratio
Relationship between two numbers of the same kind
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
Ratio
Ratio used to assess lung function
or Horovitz index (also known as the Horowitz quotient or the P/F ratio) is a ratio used to assess lung function in patients, particularly those on ventilators
Horowitz_index
Probability distribution
variable, while the F-distribution originates from the ratio of two independent chi-squared distributed random variables. More general ratio distributions have
Ratio_distribution
Measurement in finance
Sortino ratio instead of the Sharpe ratio. Modern portfolio theory Omega ratio Post-modern portfolio theory Sharpe ratio Upside potential ratio Sortino, F.A
Sortino_ratio
In probability, a theory
theory, the Mills ratio (or Mills's ratio) of a continuous random variable X {\displaystyle X} is the function m ( x ) := F ¯ ( x ) f ( x ) , {\displaystyle
Mills_ratio
Statistical test
variance calculations may be distorted, which would result in an inflated F-ratio. Sphericity can be evaluated when there are three or more levels of a repeated
Mauchly's_sphericity_test
Invariant in projective geometry
In geometry, the cross-ratio, also called the double ratio and anharmonic ratio, is a number associated with a list of four collinear points, particularly
Cross-ratio
Property of two varying quantities with a constant ratio
functions f ( x ) {\displaystyle f(x)} and g ( x ) {\displaystyle g(x)} are proportional if their ratio f ( x ) g ( x ) {\textstyle {\frac {f(x)}{g(x)}}}
Proportionality_(mathematics)
Ratio of magnetic moment to angular momentum
the gyromagnetic ratio (also sometimes known as the magnetogyric ratio in other disciplines) of a particle or system is the ratio of its magnetic moment
Gyromagnetic_ratio
Measure of financial risk
higher the Treynor ratio, the better the performance of the portfolio under analysis. T = r i − r f β i , {\displaystyle T={\frac {r_{i}-r_{f}}{\beta _{i}}}
Treynor_ratio
Ratio of the desired signal to the background noise
Signal-to-noise ratio (SNR or S/N) is a measure used in science and engineering that compares the level of a desired signal to the level of background
Signal-to-noise_ratio
The variation ratio is a simple measure of statistical dispersion in nominal distributions; it is the simplest measure of qualitative variation. It is
Variation_ratio
Ratio of lengths of fingers
The digit ratio is the ratio taken of the lengths of different digits or fingers on a hand. The most commonly studied digit ratio is that of the 2nd (index
Digit_ratio
Statistic quantifying the association between two events
odds ratio (OR) is a statistic that quantifies the strength of the association between two events, A and B. The odds ratio is defined as the ratio of the
Odds_ratio
Numerical value to determine the financial condition of a company
A financial ratio or accounting ratio states the relative magnitude of two selected numerical values taken from an enterprise's financial statements.
Financial_ratio
Dimensionless ratio of thrust to weight of a propelled vehicle
Thrust-to-weight ratio is a dimensionless ratio of thrust to weight of a reaction engine or a vehicle with such an engine. Reaction engines include jet
Thrust-to-weight_ratio
Ratio of males to females in a population
secondary sex ratio — ratio at birth tertiary sex ratio — ratio in sexually mature organisms The tertiary sex ratio is equivalent to the adult sex ratio (ASR)
Sex_ratio
Statistical test that compares goodness of fit
In statistics, the likelihood-ratio test is a hypothesis test that involves comparing the goodness of fit of two competing statistical models, typically
Likelihood-ratio_test
Measurement of the harmonic distortion present in a signal
the ratio of the RMS amplitude of a set of higher harmonic frequencies to the RMS amplitude of the first harmonic, or fundamental frequency T H D F = V
Total_harmonic_distortion
groups), the numerator of the F ratio is obtained. Under the truth of the null hypothesis, the sampling distribution of the F ratio depends on the degrees of
ANOVA_on_ranks
Indicator of health or fertility
The waist–hip ratio or waist-to-hip ratio (WHR) is the dimensionless ratio of the circumference of the waist to that of the hips. This is calculated as
Waist–hip_ratio
Measure of material deformation perpendicular to loading
In materials science and solid mechanics, Poisson's ratio (symbol: ν (nu)) is a measure of the Poisson effect, the deformation (expansion or contraction)
Poisson's_ratio
Statistical test
rely on various assumptions (see below). The ANOVA produces an F-statistic, the ratio of the variance calculated among the means to the variance within
One-way_analysis_of_variance
Topics referred to by the same term
called f-ratio, f-stop, or written f/), the focal length divided by the aperture diameter F → {\displaystyle {\vec {F}}} , F, F, force f, frequency F (or
F_(disambiguation)
Unlike the reward-to-variability ratios, such as Sharpe ratio and Sortino ratio, the Rachev ratio is a reward-to-risk ratio, which is designed to measure
Rachev_ratio
Physical quantity of interest in chemistry and electrodynamics
The mass-to-charge ratio (m/Q) is a physical quantity relating the mass (quantity of matter) and the electric charge of a given particle, expressed in
Mass-to-charge_ratio
maximum F-ratio as a short cut test for homogeneity of variance, Biometrika, 37, 308-312. David, H.A. (1952). "Upper 5 and 1% points of maximum F-ratio." Biometrika
Hartley's_test
Mathematical element in composite engineering
= ( 1 − V f ) E m + V f E f {\displaystyle E=(1-{V_{f}}){E_{m}}+{V_{f}}{E_{f}}} Where: V f {\displaystyle V_{f}} is the fiber volume ratio and E m {\displaystyle
Fiber_volume_ratio
Measure of the effectiveness of a diagnostic test
Diagnostic odds ratio, DOR = T P / F N F P / T N = T P / F P F N / T N = T P ⋅ T N F P ⋅ F N {\displaystyle {\text{Diagnostic odds ratio, DOR}}={\frac
Diagnostic_odds_ratio
between 340 newtons (76 lbf) and 450 newtons (100 lbf) and can vary the O/F ratio between 1.50 and 1.80. The chamber and throat are made of a platinum alloy
S400_(rocket_engine)
Optical test for curved mirrors
include the Gaviola or Caustic test which can measure mirrors of fast f/ratio more accurately than the Foucault test which is limited to about (λ/8)
Foucault_knife-edge_test
Ratio of an aircraft's wing span to its mean chord
to the ratio of span to chord. Thus, a long, narrow wing has a high aspect ratio, whereas a short, wide wing has a low aspect ratio. Aspect ratio and other
Aspect_ratio_(aeronautics)
Infrared telescope
classical Cassegrain telescope. The Cassegrain focus f/ratio is f/38 and the primary mirror f/ratio is 2.5. Several aspects of the design of IRTF are optimized
NASA Infrared Telescope Facility
NASA_Infrared_Telescope_Facility
Topics referred to by the same term
vegetation Filial number in the cross-breeding of hybrid animals F-ratio (disambiguation) F scale (disambiguation) F1 (disambiguation) F2 (disambiguation)
F-number_(disambiguation)
Numbers obtained by adding the two previous ones
F m F n + F m − 1 F n − 1 = F m + n − 1 , F m F n + 1 + F m − 1 F n = F m + n . {\displaystyle {\begin{aligned}{F_{m}}{F_{n}}+{F_{m-1}}{F_{n-1}}&=F_{m+n-1}
Fibonacci_sequence
Measure used in radio engineering and telecommunications
In radio engineering and telecommunications, standing wave ratio (SWR) is a measure of impedance matching of loads to the characteristic impedance of
Standing_wave_ratio
Statistical property
monotonic likelihood ratio in distributions f ( x ) {\displaystyle \ f(x)\ } and g ( x ) {\displaystyle \ g(x)\ } The ratio of the density functions
Monotone_likelihood_ratio
Financial ratio comparing stock price to company book value
The price-to-book ratio, or P/B ratio, (also PBR) is a financial ratio used to compare a company's current market value to its book value (where book value
P/B_ratio
Statistical test
and the F-ratio is calculated for it, F π {\displaystyle F^{\pi }} . The P-value is then calculated by: P = number of permutations with F π ≥ F total number
Permutational analysis of variance
Permutational_analysis_of_variance
Type of regulation on commercial banks
bank. This rate is commonly referred to as the cash reserve ratio or shortened as reserve ratio. Though the definitions vary, the commercial bank's reserves
Reserve_requirement
Design parameter of gas turbines
In aeronautical engineering, overall pressure ratio, or overall compression ratio, is the number of times the pressure is increased due to ram compression
Overall_pressure_ratio
The X:A ratio is the ratio between the number of X chromosomes and the number of sets of autosomes in an organism. This ratio is used primarily for determining
X:A_ratio
Topics referred to by the same term
Inventory the F major scale. F-number (disambiguation) F-ratio (disambiguation) This disambiguation page lists articles associated with the title F scale. If
F_scale
SpaceX family of liquid-fuel rocket engines
stagnation pressure (Pc) of 3669.5 psia and a somewhat fuel-rich engine O/F mixture ratio (MR) of 3.60. The current analysis was performed for the 100% nominal
SpaceX_Raptor
Type of catadioptric telescope
focal ratio of around f/2 and a secondary with a focal ratio also around f/2, the separation of the two mirrors determining a typical system focal ratio around
Schmidt–Cassegrain_telescope
Autotrophic members of the plankton ecosystem
nutrient composition of phytoplankton drives — and is driven by — the Redfield ratio of macronutrients generally available throughout the surface oceans. Phytoplankton
Phytoplankton
Medical ratio
In survival analysis, the hazard ratio (HR) is the ratio of the hazard rates corresponding to the conditions characterised by two distinct levels of a
Hazard_ratio
Ratio of the probability of an event happening versus not happening
be represented as the ratio o f : 1 , {\displaystyle o_{f}:1,} or conversely 1 : ( 1 / o f ) = 1 : o a , {\displaystyle 1:(1/o_{f})=1:o_{a},} from which
Odds
Logarithmic unit expressing the ratio of physical quantities
the ratio of two values of a power or root-power quantity on a logarithmic scale. Two signals whose levels differ by one decibel have a power ratio of
Decibel
Ratio of males to females in a population
human sex ratio is the ratio of males to females in a population in the context of anthropology and demography. In humans, the natural sex ratio at birth
Human_sex_ratio
Photography genre and techniques of extreme close-up pictures
offer a maximum optical reproduction ratio of 1:1 or greater, such as the Canon MP-E 65mm f/2.8 1-5x Macro, Laowa 25mm f/2.8 2.5-5X Ultra Macro (a relatively
Macro_photography
American stealth multirole fighter aircraft
improved and the aircraft scored a kill ratio of 15:1 against an F-16 aggressor squadron in a high-threat environment. F-35As were first deployed on 15 April
Lockheed Martin F-35 Lightning II
Lockheed_Martin_F-35_Lightning_II
Thermodynamic quantity
the heat capacity ratio, also known as the adiabatic index, the ratio of specific heats, or Laplace's coefficient, is the ratio of the heat capacity
Heat_capacity_ratio
Limit of the lowest low gear ratio for offroading
In off-road driving, crawl ratio is the lowest overall gear ratio that a vehicle's drivetrain is capable of, i.e. the slowest vehicle speed for the same
Crawl_ratio
Information theory quantity
the signal-to-interference-plus-noise ratio (SINR) (also known as the signal-to-noise-plus-interference ratio (SNIR)) is a quantity used to give theoretical
Signal-to-interference-plus-noise ratio
Signal-to-interference-plus-noise_ratio
Change in concentration when mixing two liquids
In chemistry and biology, the dilution ratio and dilution factor are two related (but slightly different) expressions of the change in concentration of
Dilution_ratio
Proportions of the human body in art
of the elements of the human body to each other and to the whole. These ratios are used in depictions of the human figure and may become part of an artistic
Body_proportions
American multi-role fighter aircraft
and pods. It has a thrust-to-weight ratio greater than one, providing power to climb and vertical acceleration. The F-16 was designed to be relatively inexpensive
General Dynamics F-16 Fighting Falcon
General_Dynamics_F-16_Fighting_Falcon
Multirole and air superiority fighter family
thrust-to-weight ratio of 0.75. When the proposals were studied in July 1966, the aircraft were roughly the size and weight of the TFX F-111, and like that
McDonnell_Douglas_F-15_Eagle
Describes heat transfer for surfaces
surface energy budget. The Bowen ratio is related to the evaporative fraction, E F {\displaystyle EF} , through the equation, E F = Q e Q e + Q h = 1 1 + B {\displaystyle
Bowen_ratio
The return ratio of a dependent source in a linear electrical circuit is the negative of the ratio of the current (voltage) returned to the site of the
Return_ratio
Formula for the derivative of a ratio of functions
the ratio of two differentiable functions. Let h ( x ) = f ( x ) g ( x ) {\displaystyle \textstyle h(x)={\frac {f(x)}{g(x)}}} , where both f {\displaystyle
Quotient_rule
than 8 cm water "Minimal vent settings" e.g., ratio of arterial partial pressure of oxygen to FIO2 (P/F ratio) in the vicinity of 400 A spontaneous breathing
Spontaneous_breathing_trial
Ratio of two consecutive integers
superparticular ratio, also called a superparticular number or epimoric ratio, is the ratio of two consecutive integer numbers. More particularly, the ratio takes
Superparticular_ratio
Mechanical transmission using multiple gears
of gears and gear trains include: The gear ratio of the pitch circles of mating gears defines the speed ratio and the mechanical advantage of the gear set
Gear_train
Numerical assessment of a company's finances
Leverage (long-term) ratio (1 point if the ratio is lower this year compared to the previous one, 0 otherwise); Change in Current ratio (1 point if it is
Piotroski_F-score
Heavy-duty line of trucks manufactured by Ford
axle ratio) or 20,500 lb (9,300 kg) (4.30:1 axle ratio). The only configuration was the Crew Cab (until 2019 when a Regular Cab debuted for the F-450)
Ford_Super_Duty
American carrier-capable multirole strike aircraft
The McDonnell Douglas F/A-18 Hornet is an all-weather supersonic, twin-engined, carrier-capable, multirole combat aircraft, designed as both a fighter
McDonnell Douglas F/A-18 Hornet
McDonnell_Douglas_F/A-18_Hornet
Carrier-based multi-role fighter aircraft family
the TF30, the F-14's overall thrust-to-weight ratio at maximum takeoff weight is around 0.56, considerably less than the F-15A's ratio of 0.85; when fitted
Grumman_F-14_Tomcat
Ecosystem respiration Biological pump Oceanic carbon cycle Lake metabolism f-ratio Biomass (ecology) Biogeochemical cycle Lovett, Gary M.; Cole, Jonathan
Net_ecosystem_production
Afterburning turbofan engine that powers the F-15 Eagle and F-16 Fighting Falcon
thrust-to-weight ratio of 8 and providing the F-15 with its desired thrust-to-weight ratio of greater than 1:1 at combat weight. The F100-PW-100 first flew in an F-15
Pratt_&_Whitney_F100
Ratio in naval architecture and aerospace engineering
the fineness ratio is the ratio of the length of a body to its maximum width. Shapes that are short and wide have a low fineness ratio, those that are
Fineness_ratio
Main parameter determining concrete strength and durability
The water–cement ratio (w/c ratio, or water-to-cement ratio, sometimes also called the Water-Cement Factor, f) is the ratio of the mass of water (w) to
Water–cement_ratio
Process of enlarging the apparent size of something
This enlargement is quantified by a size ratio called optical magnification or magnification ratio. When this ratio is less than one, it refers to a reduction
Magnification
Proportion of ducted compared to combusted air in a turbofan engine
The bypass ratio (BPR) of a turbofan engine is the ratio between the mass flow rate of the bypass stream to the mass flow rate entering the core. A 10:1
Bypass_ratio
version of the Sterling ratio may be adjusted to something more like a Sharpe ratio as follows: S R = A n n u a l P o r t f o l i o R e t u r n −
Sterling_ratio
Sixth-generation strike fighter program
F/A-XX is a development and acquisition program for a future sixth-generation strike fighter to replace the United States Navy's F/A-18E/F Super Hornet
F/A-XX_program
Measure of the force amplification achieved by using a tool
power out acting on the load FBVB, that is F A V A = F B V B . {\displaystyle F_{A}V_{A}=F_{B}V_{B}.\!} The ratio of the output force to the input force is
Mechanical_advantage
Ratio used in biochemistry
The AST/ALT ratio or De Ritis ratio is the ratio between the concentrations of two enzymes, aspartate transaminase (AST) and alanine transaminase, a.k
AST/ALT_ratio
the highest response ratio defined as r e s p o n s e r a t i o = w a i t i n g t i m e o f a p r o c e s s s o f a r + e s t i m a t e
Highest_response_ratio_next
American stealth air superiority fighter
demonstrated the F-22's greatly increased air combat capabilities when flying against Red Force Aggressor F-15s and F-16s with a simulated kill ratio of 108–0
Lockheed_Martin_F-22_Raptor
Surface area per unit volume
The surface-area-to-volume ratio or surface-to-volume ratio (denoted as SA:V, SA/V, or sa/vol) is the ratio between surface area and volume of an object
Surface-area-to-volume_ratio
Optical system with resolution performance at the instrument's theoretical limit
Digital Cameras". Retrieved 2025-06-13. Clark, Roger N. (2006-09-10). "The f/ratio Myth and Digital Cameras". Niek van Hulst (2009). "Many photons get more
Diffraction-limited_system
Simple machine consisting of a beam pivoted at a fixed hinge
So, F 1 a = F 2 b {\displaystyle F_{1}a=F_{2}b\!} . The mechanical advantage of a lever is the ratio of output force to input force. M A = F 2 F 1 = a
Lever
Measure of the ratio of atoms of one kind (i) to another kind (j)
The atomic ratio is a measure of the ratio of atoms of one kind (i) to another kind (j). A closely related concept is the atomic percent (or at.%), which
Atomic_ratio
Engineering ratio
The motion ratio of a mechanism is the ratio of the displacement of the point of interest to that of another point. The most common example is in a vehicle's
Motion_ratio
Telescope for observations with visible light
f-number is commonly referred to as the focal ratio notated as N {\displaystyle N} . The focal ratio of a telescope is defined as the focal length f {\displaystyle
Optical_telescope
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