# 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.
absorption coefficient absorptivity.
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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

## 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.
Farlex Partner Medical Dictionary © Farlex 2012

## 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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

## 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.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
For germination percentage, the highest correlation coefficient was recorded at 41AdegC for 72 h (r=0.674**), although the condition of 41AdegC for 48 h was the best for laboratory emergence (r=0.607**) and field emergence (r=0.492**).
The total number of the correlation coefficients n(R) being higher than |0.60| is much lower (4) than that obtained for pure coals and Type I cokes data (32).
From Figure 15, it can be seen that the correlation coefficient of the linear-fitted equation is 0.92, which shows the good linear correlation between PSV and [R.sub.q].
Physical process Scheme Cumulus convection over land Emanuel Cumulus convection over ocean Emanuel Large-scale precipitation SUBEX Radiation CCM3 Land surface CLM4.5 Lateral boundary Index relaxation Planetary boundary layer Holtslag Air-sea flux Zeng scheme Pressure gradient Hydrostatic deduction Table 2: Bias, RMSE, and pattern correlation coefficients of simulated precipitation.
WAP shows a similar trend with AHP, with a correlation coefficient of 0.937.
The relative efficiency of selection for drought resistance in breeding work can be understood by the combined analysis of genetic correlation coefficient and heritability.
The correlation coefficients obtained between (b *) and the other parameters inside of the Annona Muricata with Malathion, are shown in Table 5.
Correlation coefficients are useful tools to determine first if a correlation exists and second to determine whether the correlation is a positive or negative relationship.

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