Equation-28 represents Centroid Method, while the result is written in Table-4 column named ORF.
Values of Risk Discrimination (RD) are written in Table-4 under column RD.
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ORF is a trapezoidal function (as defined in (1)) ; it is fully specified by (a, b, c, d) ; this quadruplet is indeed given (for each risk) in Table 4
Equation 28 just says that the defuzzified estimate RD is the centroid of the x values weighted by ORF(x) (therefore the ratio, to get a proper normalization) ; technically, this just boils down to two integrals that you can perform by hand (just simple polynomials)
for the denominator, the result is just the area of the trapeze ... ((d-a)+(c-b))/2
i'm too lazy to compute the numerator !
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@Fabrice Clerot yes; you are right. I went through another paper attached herewith and found Eq-3 as the explanation for Eq-2 ; yet not producing the desired result.
Note: desired results means result to be obtained exactly as Table-4 of the previous mentioned paper where ORF = [0.0065, 0.0544, 0.1222, 1.2320] and Defuzzified ORF(underscore)T is 0.6369
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Formula(3) of your second reference is what i also get ...
and there seems to te a flaw in Table 4 of your first reference !
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