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Multiplicative factor in a mathematical expression
In mathematics, a coefficient is a multiplicative factor involved in some term of a polynomial, a series, or any other type of expression. It may be a
Coefficient
Statistics used for ranking and seeding football teams
In European football, the UEFA coefficients are statistics based in weighted arithmetic means used for ranking and seeding teams in club and international
UEFA_coefficient
Measure of inequality of a statistical distribution
In economics, the Gini coefficient (/ˈdʒiːni/ JEE-nee), also known as the Gini index or Gini ratio, is a measure of statistical dispersion intended to
Gini_coefficient
Dimensionless parameter to quantify fluid resistance
In fluid dynamics, the drag coefficient (commonly denoted as: c d {\displaystyle c_{\mathrm {d} }} , c x {\displaystyle c_{x}} or c w {\displaystyle c_{\rm
Drag_coefficient
Measure of linear correlation
statistics, the Pearson correlation coefficient (PCC), also known as Pearson's r, the Pearson product-moment correlation coefficient (PPMCC), or simply the unqualified
Pearson correlation coefficient
Pearson_correlation_coefficient
American grantmaking foundation
Coefficient Giving (formerly Open Philanthropy) is an American philanthropic advising and funding organization. Its current CEO is Alexander Berger. As
Coefficient_Giving
Number of subsets of a given size
the binomial coefficients are the positive integers that occur as coefficients in the binomial theorem. Commonly, a binomial coefficient is indexed by
Binomial_coefficient
Topics referred to by the same term
Extinction coefficient refers to several different measures of the absorption of light in a medium: Attenuation coefficient, sometimes called "extinction
Extinction_coefficient
Mathematical estimate of inbreeding
The coefficient of inbreeding (COI) is a number measuring how inbred an individual is. Specifically, it is the probability that two alleles at any locus
Coefficient_of_inbreeding
Change in nuclear fission rate caused by voids in a reactor
In nuclear engineering, the void coefficient (more properly called void coefficient of reactivity) is a number that can be used to estimate how much the
Void_coefficient
Tendency of matter to change volume in response to a change in temperature
strain) divided by the change in temperature is called the material's coefficient of linear thermal expansion. For small temperature changes, this is nearly
Thermal_expansion
Indicator for how well data points fit a line or curve
In statistics, the coefficient of determination, denoted R2 or r2 and pronounced "R squared", is the proportion of the variation in the dependent variable
Coefficient_of_determination
Numerical measure of a statistical relationship between variables
A correlation coefficient is a numerical measure of some type of linear correlation, meaning a linear function between two variables. The variables may
Correlation_coefficient
Ratio of concentrations in a mixture at equilibrium
In the physical sciences, a partition coefficient (P) or distribution coefficient (D) is the ratio of concentrations of a compound in a mixture of two
Partition_coefficient
Measure of biological relationship between individuals
The coefficient of relationship is a measure of the degree of consanguinity (or biological relationship) between two individuals. The term coefficient of
Coefficient_of_relationship
Measure of a device's efficiency at allowing fluid flow
The flow coefficient of a device is a relative measure of its efficiency at allowing fluid flow. It describes the relationship between the pressure drop
Flow_coefficient
Concept in physics and chemistry
The transmission coefficient is used in physics and electrical engineering when wave propagation in a medium containing discontinuities is considered
Transmission_coefficient
Light or sound absorption in a substance
The linear attenuation coefficient, attenuation coefficient, or narrow-beam attenuation coefficient characterizes how easily a volume of material can be
Attenuation_coefficient
Relative measure of dispersion expressed as the ratio of standard deviation to the mean
In probability theory and statistics, the coefficient of variation (CV), also known as normalized root-mean-square deviation (NRMSD), and relative standard
Coefficient_of_variation
Nonparametric measure of rank correlation
In statistics, Spearman's rank correlation coefficient or Spearman's ρ is a number ranging from -1 to 1 that indicates how strongly two sets of ranks
Spearman's rank correlation coefficient
Spearman's_rank_correlation_coefficient
Value accounting for thermodynamic non-ideality of mixtures
In thermodynamics, an activity coefficient is a factor used to account for deviation of a mixture of chemical substances from ideal behaviour. In an ideal
Activity_coefficient
Measure of voltage induced by change of temperature
The Seebeck coefficient (also known as thermopower, thermoelectric power, and thermoelectric sensitivity) of a material is a measure of the magnitude
Seebeck_coefficient
Topics referred to by the same term
Coupling coefficient, or coupling factor, may refer to: Electromechanical coupling coefficient Coupling coefficient (inductors), or coupling factor, between
Coupling_coefficient
Measure of how strongly a chemical species absorbs a given wavelength of light
In chemistry, the molar absorption coefficient or molar attenuation coefficient (ε) is a measurement of how strongly a chemical species absorbs, and thereby
Molar_absorption_coefficient
Measure used in population genetics
Selection coefficient, usually denoted by the letter s, is a measure used in population genetics to quantify the relative fitness of a genotype compared
Selection_coefficient
Physical measure of overcoming air resistance
In ballistics, the ballistic coefficient (BC, Cb) of a body is a measure of its ability to overcome air resistance in flight. It is inversely proportional
Ballistic_coefficient
Derivative of a function
differential coefficient of a function f(x) is what is now called its derivative df(x)/dx, the (not necessarily constant) multiplicative factor or coefficient of
Differential_coefficient
Dimensionless number describing relative pressures in a fluid flow field
the pressure coefficient is a dimensionless number which describes the relative pressures throughout a flow field. The pressure coefficient is used in aerodynamics
Pressure_coefficient
Measure of wave reflectivity
In physics and electrical engineering the reflection coefficient is a parameter that describes how much of a wave is reflected by an impedance discontinuity
Reflection_coefficient
Differential equation parameter in thermal physics
A temperature coefficient describes the relative change of a physical property that is associated with a given change in temperature. For a property R
Temperature_coefficient
Statistical measure of association for two binary variables
In statistics, the phi coefficient, also known as the mean square contingency coefficient or Yule coefficient of correlation and commonly denoted by φ
Phi_coefficient
Measurement system of the relative strength of powerlifters
The Wilks coefficient or Wilks formula is a mathematical coefficient that can be used to measure the relative strengths of powerlifters despite the different
Wilks_coefficient
Measure of how connected and clustered a node is in its graph
In graph theory, a clustering coefficient is a measure of the degree to which nodes in a graph tend to cluster together. Evidence suggests that in most
Clustering_coefficient
Dimensionless quantity relating lift to fluid density and velocity over an area
In fluid dynamics, the lift coefficient (CL) is a dimensionless quantity that relates the lift generated by a lifting body to the fluid density around
Lift_coefficient
Statistical measure of reliability
α {\displaystyle \alpha } ) or coefficient alpha (coefficient α {\displaystyle \alpha } ), is a reliability coefficient and a measure of the internal consistency
Cronbach's_alpha
Quantity relating heat flux and temperature difference
In thermodynamics, the heat transfer coefficient or film coefficient, or film effectiveness, is the proportionality constant between the heat flux and
Heat_transfer_coefficient
In statistics, the uncertainty coefficient, also called proficiency, entropy coefficient or Theil's U, is a measure of nominal association. It was first
Uncertainty_coefficient
Physical coefficient is an important number that characterizes some physical property of a technical or scientific object under specified conditions.
Physical_coefficient
Measure of prediction's merit in finance
The information coefficient (IC) is a measure of the merit of a predicted value. In finance, the information coefficient is used as a performance metric
Information_coefficient
Force resisting sliding motion
pavement has a high coefficient of friction. Coefficients of friction range from near zero to greater than one. The coefficient of friction between two
Friction
like the Gini coefficient and specific income ratios. Income from black market economic activity is not included. The Gini coefficient is a number between
List of countries by income inequality
List_of_countries_by_income_inequality
The active reflection coefficient (ARC) is the reflection coefficient for a single antenna element in an array antenna, in the presence of mutual coupling
Active_reflection_coefficient
In statistics, a measurement of the agreement between two variables
In statistics, the concordance correlation coefficient measures the agreement between two variables, e.g., to evaluate reproducibility or for inter-rater
Concordance correlation coefficient
Concordance_correlation_coefficient
Ratio characterising inelastic collisions
In classical mechanics, the coefficient of restitution (COR, also denoted by e), is a measure of the springiness of collisions between two surfaces. Newton's
Coefficient_of_restitution
Family of polynomials
Gaussian binomial coefficients (also called Gaussian coefficients, Gaussian numbers, Gaussian polynomials, or q-binomial coefficients) are q-analogs of
Gaussian_binomial_coefficient
Similarity measure between sets
The overlap coefficient, or Szymkiewicz–Simpson coefficient,[citation needed] is a similarity measure that measures the overlap between two finite sets
Overlap_coefficient
Season of UEFA's top-tier European club football competition
currently suspended). The association ranking based on the UEFA association coefficients is used to determine the number of participating teams for each association:
2026–27_UEFA_Champions_League
Statistical relationship
more electricity for heating or cooling. There are several correlation coefficients that may be used to measure correlation, often denoted ρ {\displaystyle
Correlation
In multivariate statistics, the congruence coefficient is an index of the similarity between factors that have been derived in a factor analysis. It was
Congruence_coefficient
Resistance of a car to moving through air
The drag coefficient is a common measure in automotive design as it pertains to aerodynamics. Drag is a force that acts parallel to and in the same direction
Automobile_drag_coefficient
Measure of similarity and diversity between sets
independently by Paul Jaccard, originally giving the French name coefficient de communauté (coefficient of community), and independently formulated again by Taffee
Jaccard_index
binding coefficient is a quantity representing the extent to which a chemical compound will bind to a macromolecule. The preferential binding coefficient can
Binding_coefficient
Direct conversion of temperature differences to electric voltage and vice versa
create temperature differences), and the Thomson effect (the Seebeck coefficient varies with temperature). The Seebeck and Peltier effects are different
Thermoelectric_effect
Topics referred to by the same term
Look up coefficient in Wiktionary, the free dictionary. Coefficient could have one of the following meanings: A coefficient is a constant multiplication
Coefficient_(disambiguation)
statistics, the RV coefficient is a multivariate generalization of the squared Pearson correlation coefficient (because the RV coefficient takes values between
RV_coefficient
European football tournament
clubs from one nation, with England earning an extra spot through UEFA coefficient ranking and Tottenham Hotspur having won the previous season's UEFA Europa
2025–26_UEFA_Champions_League
Quantity characterizing the deviation of a solvent from ideal behavior
An osmotic coefficient ϕ {\displaystyle \phi } is a quantity which characterises the deviation of a solvent from ideal behaviour, referenced to Raoult's
Osmotic_coefficient
The wear coefficient is a physical coefficient used to measure, characterize and correlate the wear of materials. Traditionally, the wear of materials
Wear_coefficient
Ratio of useful heating or cooling provided to work required
The coefficient of performance or COP (sometimes CP or CoP) of a heat pump, refrigerator or air conditioning system is a ratio of the useful heating or
Coefficient_of_performance
Property of materials
The mass attenuation coefficient, or mass narrow beam attenuation coefficient of a material is the attenuation coefficient normalized by the density of
Mass_attenuation_coefficient
Proportionality constant in some physical laws
Diffusivity, mass diffusivity or diffusion coefficient is usually written as the proportionality constant between the molar flux due to molecular diffusion
Mass_diffusivity
Statistic for rank correlation
In statistics, the Kendall rank correlation coefficient, commonly referred to as Kendall's τ coefficient (after the Greek letter τ, tau), is a statistic
Kendall rank correlation coefficient
Kendall_rank_correlation_coefficient
Qualification phase of the 2026–27 UEFA Conference League
with the higher coefficient of an undecided tie advances to the subsequent round, which means if the team with the lower coefficient advances, it simply
2026–27 UEFA Conference League qualifying
2026–27_UEFA_Conference_League_qualifying
Statistical concept
In statistics, the coefficient of multiple correlation is a measure of how well a given variable can be predicted using a linear function of a set of
Coefficient of multiple correlation
Coefficient_of_multiple_correlation
Similarity measure for number sequences
Other names for cosine similarity include Orchini similarity and Tucker coefficient of congruence; the Otsuka–Ochiai similarity (see below) is cosine similarity
Cosine_similarity
Method of conducting social research
A humanistic coefficient (Polish: współczynnik humanistyczny) is a conceptual object, methodological principle, or method of conducting social research
Humanistic_coefficient
transport coefficient γ {\displaystyle \gamma } measures how rapidly a perturbed system returns to equilibrium. The transport coefficients occur in transport
Transport_coefficient
The piezoelectric charge coefficient or piezoelectric modulus, usually written d33, quantifies the volume change when a piezoelectric material is subject
Piezoelectric_coefficient
Path coefficients are standardized versions of linear regression weights which can be used in examining the possible causal linkage between statistical
Path_coefficient
Phenomenon of non-ideal fluids changing temperature
expansion is quantified by the Joule–Thomson coefficient, μ J T {\displaystyle \mu _{\mathrm {JT} }} . This coefficient may be either positive (corresponding
Joule–Thomson_effect
The electromechanical coupling coefficient is a numerical measure of the conversion efficiency between electrical and acoustic energy in piezoelectric
Electromechanical coupling coefficient
Electromechanical_coupling_coefficient
or other constriction, the discharge coefficient (also known as coefficient of discharge or efflux coefficient) is the ratio of the actual discharge
Discharge_coefficient
Tendency of a particle to settle out of suspension during centrifugation
In chemistry, the sedimentation coefficient (s) of a particle characterizes its sedimentation (tendency to settle out of suspension) during centrifugation
Sedimentation_coefficient
In control theory, the coefficient diagram method (CDM) is an algebraic approach applied to a polynomial loop in the parameter space. A special diagram
Coefficient_diagram_method
Establish relationships between homology and cohomology theories
universal coefficient theorems (UCT) establish relationships between homology groups (or cohomology groups) with different coefficients. For instance
Universal_coefficient_theorem
Measure of nuclear reactor fuel stability
temperature coefficient of reactivity is the change in reactivity of the nuclear fuel per degree change in the fuel temperature. The coefficient quantifies
Fuel temperature coefficient of reactivity
Fuel_temperature_coefficient_of_reactivity
Sequence of numbers ((2n) choose (n))
In mathematics the nth central binomial coefficient is the particular binomial coefficient ( 2 n n ) = ( 2 n ) ! ( n ! ) 2 for all n ≥ 0. {\displaystyle
Central_binomial_coefficient
Matrix whose entries are the coefficients of a linear equation
In linear algebra, a coefficient matrix is a matrix consisting of the coefficients of the variables in a set of linear equations. The matrix is used in
Coefficient_matrix
Atomic diffusion within a crystalline lattice
movement of atoms can be described as jumps, and the interstitial diffusion coefficient depends on the jump frequency. The jump frequency, Γ {\displaystyle \Gamma
Lattice_diffusion_coefficient
Estimates from regression analysis on data with unit variance
In statistics, standardized (regression) coefficients, also called beta coefficients or beta weights, are the estimates resulting from a regression analysis
Standardized_coefficient
In physiology, filtration coefficient (Kf) is the product of a biological membrane's permeability to water and the surface area of the membrane. Typical
Filtration_coefficient
Characteristic of rocket engine nozzles
Thrust coefficient or c F {\displaystyle c_{F}} (sometimes c τ {\displaystyle c_{\tau }} ) is a dimensionless number that measures the performance of
Thrust_coefficient
The thermo-optic coefficient of a material is the change in refractive index with the response to temperature. The coefficient is a fundamental optical
Thermo-optic_coefficient
Statistical modeling method
regression coefficients (although the latter term is sometimes reserved for the estimated effects). In simple linear regression, p=1, and the coefficient is known
Linear_regression
Two related parameters used in description of the kinetics of electrochemical reactions
Charge transfer coefficient, and symmetry factor (symbols α and β, respectively) are two related parameters used in description of the kinetics of electrochemical
Charge_transfer_coefficient
Functions on special groups related to their matrix representations
In mathematics, a matrix coefficient (or matrix element) is a function on a group of a special form, which depends on a linear representation of the group
Matrix_coefficient
Method to compare weigh classes in Olympic weightlifting
The Sinclair Coefficients are a method to compare different weight classes in Olympic weightlifting. It replaced Hoffman's formula, which was the first
Sinclair_coefficient
Statistic used for comparing the similarity of two samples
The Dice-Sørensen coefficient is a statistic used to gauge the similarity of two samples. It was independently developed by the botanists Lee Raymond
Dice-Sørensen_coefficient
Football tournament qualification stage
the higher coefficient of an undecided tie advances to the subsequent round. In practice, this means if the team with the lower coefficient advances in
2026–27 UEFA Europa League qualifying
2026–27_UEFA_Europa_League_qualifying
Watertight buoyant body of a ship or boat
the volume of water displaced by the hull. Coefficients help compare hull forms as well: Block coefficient (Cb) is the volume (V) divided by the LWL ×
Hull_(watercraft)
Diffusion coefficient of ions in solution
The Warburg coefficient (or Warburg constant; denoted AW or σ) is the diffusion coefficient of ions in solution, associated to the Warburg element, ZW
Warburg_coefficient
Shading coefficient (SC) is a measure of thermal performance of a glass unit (panel or window) in a building. It is the ratio of solar gain (due to direct
Shading_coefficient
Adage that work expands to fill its available time
rule about the efficiency of administrative councils. He defined a "coefficient of inefficiency" with the number of members as the main determining variable
Parkinson's_Law
In genetics, the coefficient of coincidence (c.o.c.) is a measure of interference in the formation of chromosomal crossovers during meiosis. It is generally
Coefficient_of_coincidence
Quantities describing probability of absorption or emission of light
Einstein coefficients are quantities describing the probability of absorption or emission of a photon by an atom or molecule. The Einstein A coefficients are
Einstein_coefficients
Statistic measuring inter-rater agreement for categorical items
Cohen's kappa coefficient (symbol κ, lowercase Greek kappa) is a statistic used to measure inter-rater reliability for qualitative or categorical data
Cohen's_kappa
Force resisting the motion when a body rolls on a surface
expressed as a coefficient times the normal force. This coefficient of rolling resistance is generally much smaller than the coefficient of sliding friction
Rolling_resistance
Efficiency of luminaire in transferring light energy
A coefficient of utilization (CU) is a measure of the efficiency of a luminaire in transferring luminous energy to the working plane in a particular area
Coefficient_of_utilization
Measure of solubility of general anaesthetics in blood
Blood–gas partition coefficient, also known as Ostwald coefficient for blood–gas, is a term used in pharmacology to describe the solubility of inhaled
Blood–gas partition coefficient
Blood–gas_partition_coefficient
List of drag coefficients and drag areas for automobiles
automobile drag coefficients (Cd) and drag areas (CdA) for production, limited-production, and concept or experimental vehicles. The drag coefficient is a dimensionless
List of automobile drag coefficients
List_of_automobile_drag_coefficients
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