Table 7: Characteristics of maximum response Y.

ResponseTarget valueWeightdi (%) (%) (%)Cal. valueExp. value

Y = REE (ppm)81100.0093.17100.007.997.12
Desirability100.0093.17100.00

di: partial desirability of response Yi; : minimal partial desirability of response Yi; : maximal partial desirability of response Yi; Cal. value: calculated value; and Exp. value: experimental value.