The significance and the goodness of fitting of the model were
evaluated through the regression coefficient (R2) and the absolute
mean of relative error (MARE), evaluated as follows:
MARE ¼ 1n
P
n
i¼1
E%i j j. The equation of the relative error (E%) was the following:
E% ¼ 100
n P
n
i¼1
x0−xp ð Þ
x0
where x0 and xp are the experimental values
and those predicted by Gompertz equation, respectively.