An Improved Metabolism Grey Model for Predicting Small Samples with a Singular Datum and Its Application to Sulfur Dioxide Emissions in China

Table 7

Comparisons of four types of errors based on three grey prediction models.

Models	Fitting average residuals	Prediction average residuals	Fitting average relative errors	Prediction average relative errors
GM	27.7088	52.8512	0.00017	0.0255
MGM	27.7088	70.3336	0.00017	0.0341
IMGM	20.6504	15.761	0.00007	0.0071