Concordance coefficient

The obtained results facilitate constructing the rank graph. However, prior to that, one should determine the degree of opinion concordance of all the researchers by the concordance coefficient ... 

Before drawing a conclusion based on the concordance coefficient, it is necessary to test its significance. Thereby one should keep in mind that value m(k-l)[Pg.197]

Since the concordance coefficient values are significantly different from zero, one may say that there is concordance among the opinions of eight researchers. To be sure, the significance of the concordance coefficient was checked by Eq. (2.32). 

In a process of chlorinating titanium, seven technological factors were suggested to be analyzed. Five researchers were asked prior to ranking of the factors. The rank matrix is shown in Table 2.15. Determine the concordance coefficient for the researchers opinions. 

The selection of factors from the work [16] was done hy the significance of their effects on caoutchouc drying and after processing the opinions of eighteen researchers. The analysis included these eleven factors Xi inlet and outlet moisture ratio X2 pH value in the sixth apparatus X3 pH value in the seventh apparatus X+ NaCl consumption X5 serum consumption in the sixth apparatus X6 serum consumption in the seventh apparatus X serum temperature X8 latex type X9 fat content in caoutchouc X10 latex fat consumption on machine and Xu quantity of latex on the surface. Outcomes of the ranking of the factors are shown in Table 2.16. Determine the concordance coefficient and check its significance. 

Sixteen factors were defined in the process of refining petroleum oils. By the method of prior ranking, determine the concordance coefficient and check its significance. Concordance of data from reference literature is checked based on ranking outcomes shown in Table 2.17. 

Three goodness of fit metrics bear particular attention the coefficient of determination, the correlation coefficient, and the concordance coefficient. The coefficient of determination (R2) is simply... 

The reader is referred to Lin (1981) for details on calculating the variance of the concordance coefficient, which is not easily done. One disadvantage to the concordance coefficient is that, like the correlation coefficient and coefficient of determination, there are no guidelines as to what constitutes good agreement between observed and predicted values. This is left to the analyst to decide. Similarly the concordance coefficient can be just as misleading as a correlation coefficient and all the caveats regarding use of the correlation coefficient apply to the concordance coefficient as well. Vonesh, Chinchilli, and Pu (1996) present the use of concordance coefficient in population models. 

The concordance of the results in Figure 6-2 with the known mass absorption coefficients of iron may be judged from Table 6-1. 

DPD activity measured in PBMC is used as a surrogate for systemic DPD activity. DPD activity is normally distributed and highly variable among individuals (coefficient of variation of 33.9-46.6%) [43, 56-59]. DPD activity is undetectable in totally deficient patients. The majority of partially deficient patients had a DPD value < 30% of the mean in the normal population, and this value is considered the cut-off for patients at higher risk of toxicity. Among patients experiencing severe toxicity after 5-FU, 36-59% of them were deficient in DPD activity [43, 53, 60]. This suggests the involvement of other determinants in the susceptibility to 5-FU toxicity. The concordance between liver and PBMC DPD activity is modest [61], and normal DPD activity in PBMC was found in one patient with very depressed liver DPD activity who died because of 5-FU toxicities [44]. 

Because these are quantitative traits, correlation coefficients, rather than concordance rates, are given. 

In the molten condition the density of sulphur is dependent only on the temperature, provided that the equilibrium condition between A-sulphur and y-sulphur has been attained at 113° C. the density is 1 811, the value then rising somewhat up to about 100° C.,2 then steadily falling to 1 480 at 446° C. The coefficient of expansion has been measured by several investigators, but on account of the complications introduced by the gradual readjustment of the equilibrium at new temperatures, the results are not altogether concordant, although they supply confirmatory evidence of the existence of the equilibrium. The mean specific heat of mobile sulphur is 0 220 and of viscous sulphur 0-290.4... 

Two IC assays compared Receptor principle similar or different6 Correlation coefficient Concordance in results 7 Number of sera tested p value... 

The individual panelists ranking of the four standards should not be influenced by the presence of two extra, clearly identifiable items, and the panel could therefore be tested for its ability to rank the standards correctly. This was done by calculating the "coefficient of concordance", as described by e.g. Moroney (12). The SR-values used in these calculations were the SR-values obtained after omitting the two samples from each individual ranking and the null-hypothesis for the test was that the actual SR-values should be equal to the SR-values which would have been obtained if all the panelists had ranked the standards correctly. 

Khan [174] studied the electrooxidation of ferrocene at a Pt electrode in polar solvents ranging from methanol to heptan-l-ol. Experimental data concorded well with the calculated results when solvent influence on the pre-exponential coefficient was considered. In calculations v = rb was used. Khan [174] points out that expressed by Eq. (36) exhibits a temperature dependence different from that predicted by the classical expression = k T/h. Another conclusion which may follow from the same paper is that the transmission coefficient for the electrochemical outer-sphere electron-transfer reactions in polar alcoholic solvents may not be equal to unity. 

The quality of the resolution results can be evaluated from a comparison between the actual spectral and time profiles of species with those recovered by MCR-ALS. Actual profiles can be found experimentally by recording CE runs of pure standards of components. The concordance between true and calculated profiles can be measured with correlation coefficients. Values close to 1 suggest that results are not affected by rotational ambiguities. Conversely, values significantly lower than 1 indicate that ambiguities still persist (43). 

For Reaction R4 the rate coefficient Pxx+A computed from Formulae 2.1 and 10 agrees closely with the values found from experiment (usually denoted as a/n or a/p) and long known as the Townsend coefficient of ionization (24). For Reaction R5 and for similar reactions generating the radiative species H2 (a 3V) and N2 (C 3nu), a similar concordance is found between experiment and the predictions of theory (16, 58, 59, 61, 74). In discussing possible interpretations of Kirkby s data for positive column reaction, it is assumed that the Maxwellian form for /(E) is a valid approximation to the true distribution. 

Lin, L.I. A concordance correlation coefficient to evaluate reproducibility. Biometrics 1989 45 255-268. 

The reproducibility of the HuSNP system can be assessed by correlation between duplicated experiments. To evaluate concordance between two duplicate experiments, we computed the Pearson correlation coefficient between the two experiments using the mean intensity of the probe pairs from each allele of a SNP. Pearson correlation coefficient is 0.98 to 0.99 for genomic DNA and 0.88 to 0.96 for cDNA (2). 

A principal component analysis (PCA) using simple molecular descriptors showed that the training and test sets overlapped. Focusing on compounds with a Tanimoto similarity greater than 0.7 resulted in a test set of 28 compounds, which had Matthews correlation coefficient and concordance statistics that... 

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