Prediction of Vegetable Supply in Henan Province Based on PSO-GM (1, N) Model

Table 4

Prediction results of PSO-GM (1, 4)/GM (1, 4)/GM (1, 1)/multiple linear regression.

Year	Actual value	PSO-GM (1, 4)	GM (1, 4)	GM (1, 1)	Multiple linear regression
2017	504.11	518.49	546.50	543.01	535.48
2018	538.41	536.02	571.50	587.93	480.18
2019	570.21	548.23	568.90	636.57	490.72
Average relative error (%)		2.38	4.93	9.52	10.32