Table 1. Summary of the quantile residuals for the model based on the log-normal distribution and Singh-Maddala distribution.

	Log-normal	Singh-Maddala
Mean	-0.000091	-0.001102
Variance	1.000235	0.998379
Coef. of Skewness	0.701639	0.060098
Coef. of Kurtosis	6.016006	3.115085
Filliben Correlation Coef.	0.984499	0.999201

Notes: A good fit is indicated by values close to 0, 1, 0, 3 and 1 for mean, variance, skewness, kurtosis, and Filliben correlation coefficient, respectively.