coefficient of variation


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co·ef·fi·cient of var·i·a·tion (CV),

the ratio of the standard deviation to the mean.

coefficient of variation

Lab medicine The standard deviation divided by the mean, expressed as a percentage, used to evaluate and compare methodologies and instruments. See Mean, Standard deviation.

co·ef·fi·cient of var·i·a·tion

(CV) (kō'ĕ-fish'ĕnt var'ē-ā'shŭn)
A unitless number used to describe dispersion of data. It allows comparison of standard deviations of test results expressed in different units. It is calculated from the standard deviation (s) and mean (x). CV = 100s÷x.

coefficient of variation

Analytical variability expressed as the standard deviation's percentage of the mean. This mode of expressing the analytical variability enables one to determine if the variability proportion changes with the actual value. It is typically a useful tool when there is a relatively large dynamic range for the quantity being measured. It is subject to misinterpretation if applied to numbers that have already been mathematically manipulated, such as logarithms.
See also: coefficient
References in periodicals archive ?
The calculations for Christiansen's Uniformity Coefficient (CUC), Distribution Uniformity Coefficient (DUC), standard deviation (SD), coefficient of variation (CV), mean and current values of the photovoltaic panel for the suction pump are presented in the table below.
At the same actuation system, the control group obtained an average of 8.7 [+ or -] 2.45 seconds in the initial test, with a coefficient of variation of 16.446%, indicating a collective of average homogeneity, and an average of 12, 4 [+ or -] 2.06 seconds in the final test, with a coefficient of variation of 16.378%, also indicating an average of a homogeneity.
The average wetted depth of inline is 14.53 cm with standard deviation of 0.98 cm and the coefficient of variation is 6.77 % and the average witted depth of online is 13.42 cm with standard deviation of 1.88 cm and the coefficient of variation is 13.99 %.
We calculated minimum, maximum, mean, standard deviation, median and first and third quartiles of the sampling coefficient of variation in the different categories.
Caption: Figure 7--ultrasonic amplitude In A of the extruded rubber compound and the corresponding coefficient of variation for increasing mixing efficiency (increasing pressure P1) for the Shark go; P1 = 35 bar for t [less than or equal to] 15 minutes, and P1 = 50 bar for [greater than or equal to] 20 minutes
Caption: FIGURE 1: The change of the coefficient of variation CV for 22 proteins: APOL6, CASP1, CNP, CXCL10, DHX58, DRAP1, DYNLT1, FAM46A, GEMIN4, GORASP1, IFITM1, IRF7, PLSCR1, RTP4, SAMD9, SAMHD1, SIGLEC1, TAF1C, TLR7, TNFAIP6, TREX1, and ZBP1, The %-axis denotes the time (unit: h), It indicates that as the critical transition occurs, that is, the time evolves towards t = 45 h (see the vertical black line), the coefficient of variation CV for 22 proteins above significantly increases in the symptomatic group and has no obvious change in the asymptomatic group, Therefore, these 22 proteins can be viewed as DNBs for early-warning signals,
High phenotypic coefficient of variation was also recorded for millable cane (23.19) and individual cane weight (37.96).
The results confirmed that the high short-term revenue momentum (STRM) outperformed the low short term revenue momentum (STRM) with Coefficient of Variation (CV) of 1.66 versus 3.90.
At the time the rating was assigned, the model output indicated that the class A notes would have achieved Aa3, same as the initial assigned rating, even if either the coefficient of variation of default were 75% or the mean default rate were 2.3% instead of the base case assumptions (all other factors unchanged), and a lowered model output at A2 instead if the mean default rate were 2.3% and coefficient of variation of default were 75% instead of the base case assumptions (all other factors unchanged).
TABLE 2: MAXILLARY MEANS, STANDER DEVIATIONS, MINIMUM AND MAXIMUM VALUES OF THE INDIVIDUAL TOOTH WIDTH FOR BOTH SEXES (VALUES IN MILLIMETERS), COEFFICIENT OF VARIATION OF INDIVIDUAL TOOTH WIDTH (COV)
Transfer efficiency and coefficient of variation for different aperture geometries with 0.63 area ratios.
Vedder then calculates the coefficient of variation in each of these two measures across the 48 contiguous states for selected years.

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