correlation coefficient


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coefficient

 [ko″ĕ-fish´ent]
1. an expression of the change or effect produced by the variation in certain variables, or of the ratio between two different quantities.
2. in chemistry, a number or figure put before a chemical formula to indicate how many times the formula is to be multiplied.
Bunsen coefficient the number of milliliters of gas dissolved in a milliliter of liquid at atmospheric pressure (760 mm Hg) and a specified temperature. Symbol, α.
confidence coefficient the probability that a confidence interval will contain the true value of the population parameter. For example, if the confidence coefficient is 0.95, 95 per cent of the confidence intervals so calculated for a large number of random samples would contain the parameter.
correlation coefficient a numerical value that indicates the degree and direction of relationship between two variables; the coefficients range in value from +1.00 (perfect positive relationship) to 0.00 (no relationship) to −1.00 (perfect negative or inverse relationship).
diffusion coefficient see diffusion coefficient.
coefficient of digestibility the proportion of a food that is digested compared to what is absorbed, expressed as a percentage.
dilution coefficient a number that expresses the effectiveness of a disinfectant for a given organism. It is calculated by the equation tcn = k, where t is the time required for killing all organisms, c is the concentration of disinfectant, n is the dilution coefficient, and k is a constant. A low coefficient indicates the disinfectant is effective at a low concentration.
linear absorption coefficient the fraction of a beam of radiation absorbed per unit thickness of absorber.
mass absorption coefficient the linear absorption coefficient divided by the density of the absorber.
phenol coefficient see phenol coefficient.
sedimentation coefficient the velocity at which a particle sediments in a centrifuge divided by the applied centrifugal field, the result having units of time (velocity divided by acceleration), usually expressed in Svedberg units (S), which equal 10−13 second. Sedimentation coefficients are used to characterize the size of macromolecules; they increase with increasing mass and density and are higher for globular than for fibrous particles.

cor·re·la·tion co·ef·fi·cient

a measure of association that indicates the degree to which two variables have a linear relationship; this coefficient, represented by the letter r, can vary between +1 and -1; when r = +1, there is a perfect positive linear relationship in which one variable relates directly with the other; when r = -1, there is a perfect negative linear relationship between the variables.

cor·re·la·tion co·ef·fi·cient

(kōrĕ-lāshŭn kōĕ-fishĕnt)
Measure of association that indicates the degree to which two variables have a linear relationship.

cor·re·la·tion co·ef·fi·cient

(kōrĕ-lā shŭn kōĕ-fishĕnt)
Measure of association that indicates degree to which two variables have a linear relationship.

coefficient

1. an expression of the change or effect produced by the variation in certain factors, or of the ratio between two different quantities.
2. in chemistry, a number or figure put before a chemical formula to indicate how many times the formula is to be multiplied.

absorption coefficient
1. the fraction of a beam of radiation that is absorbed in passing through a unit length of absorbing material.
2. a number indicating the volume of a gas absorbed by a unit volume of a liquid at 32°F (0°C) and at a pressure of 760 mmHg.
alienation coefficient
a measure of the lack of association between two variables. Called also the coefficient of nondetermination.
Bunsen coefficient
see absorption coefficient (2) (above).
contingency coefficient
a measure of association between qualitative assessments of two variables.
correlation coefficient
a measure of association which indicates the degree to which two or more sets of observations fit a linear relationship. Denoted by 'r', it can vary from −1.0 to 1.0.
determination coefficient
the coefficient of determination is the square of the correlation coefficient (r2). It describes the proportion of the variation of one of the correlated variables, explainable by the variation of the other variable. The value of the coefficient must lie between 0 and 1.
digestibility coefficient
percentage of the food ingested that is absorbed.
disarray coefficient
the measure of the degree of discord between two variables.
friction coefficient
the effect that the material in a surface has on the frictional force created by the application of a force to the surface: S = f × N, where S = friction, f = friction coefficient, N = reaction to the vertical application of a given force. In a normal joint the f value is very small (0.008).
coefficient of nondetermination
see alienation coefficient.

correlation

1. in neurology, the union of afferent impulses within a nerve center to bring about an appropriate response.
2. the degree to which statistical variables vary together.

correlation coefficient
see correlation coefficient.
References in periodicals archive ?
87 days) for the reliability studies could contribute to a lasting memory effect, artificially increasing the correlation coefficients of the IDA variables.
As can be seen from Figure 1, there are many periods during which the correlation coefficient is not significantly different from zero.
The correlation coefficients for the regression between dynamic MOE by a magnetic driver and MOR for Sitka spruce and red pine finger-jointed wood specimens were 0.
and 2) Spearman's rank correlation coefficient, let's denote it by r5, which is obtained from the previous one by replacing, for each i [member of] {1, 2, .
procedure eneahoric(n,n1,n2,n3,n4,a,b,d,e:in teger;alfa:real;var r:real); {The procedure calculates the eneahoric correlation coefficient for a given number of subjects; Once this coefficient is calculated, its meaning will be checked for a chosen meaning threshold : 0,10; 0,05; 0,02; 0,01 sau 0,001; Parameters meaning is: n = the total number of subjects (12,22,32,42,52,62,72,82,92 or 102) variabila X: mare mediu mic mare n1 a n2 variabila Y: mediu b d mic n4 e n3 alfa = pragul de semnificatie ales r = coeficientul de corelatie} var aa,bb,cc,dd:integer; v:array[1.
x,y] = correlation coefficient as computed from the sets X and Y of values paired as ([X.
Similar trend is observed for correlation coefficient between arsenic and iron concentration of groundwater in most of the districts of Bangladesh.
When the correlation coefficient is lower than one, the maximum is reached for [[sigma].
For somatic state anxiety, the ARS-2 exhibited a correlation coefficient that was slightly larger than the correlation for the ARS, but clearly larger than for the ARS-1.
The simple correlation coefficient bilateral (two-tail) Align and retain talent Organizational Commitment Pearson's correlation coefficient 0.
The range correlation coefficient of Spearman, rs, is calculated by using the ranges as pairs of observations of the two variables, which are called x and y in the formula, in order to obtain the following coefficient:
A] is the genetic correlation coefficient of target trait Y with indicator trait X.