[Retracted] A Study of Regional Economic Disparities and Coordinated Development Based on Improving Grey Model Combinations

Table 4

Comparison of forecast results for 2018 under four combinations of models for the GDP dataset.

Unit (100 million yuan)	Q1	Q1-Q2	Q1-Q2	Q1-Q2
True value	198786	418961	650128	900309
Traditional GM	223142	451382	653887	915478
Unbiased GM	222365	449138	682547	912358
Moving average GM	221457	447586	6478252	912789
Combined GM	222543	449985	684571	914587