Compound Grey-Logistic Model and Its Application

Table 2

Error of estimation model: APE (MAPE, entropy).

Time (month/year)	Grey forecast (%)	Logistic forecast (%)	Grey-logistic forecast (%)	Time (month/year)	Grey forecast (%)	Logistic forecast (%)	Grey-logistic forecast (%)
2/18	8.41	6.42	6.04	9/19	20.93	25.12	20.75
3/18	4.47	3.41	3.70	10/19	17.02	26.31	16.83
4/18	10.65	1.37	9.93	11/19	18.16	27.48	17.96
5/18	6.46	0.60	5.86	12/19	9.42	28.61	9.69
6/18	2.95	2.51	2.45	1/20	10.20	29.71	9.98
7/18	9.89	4.36	10.25	2/20	56.94	30.79	57.31
8/18	15.31	6.15	15.59	3/20	3.64	31.84	3.42
9/18	4.13	7.88	4.38	4/20	12.58	32.86	12.82
10/18	6.84	9.56	6.64	5/20	1.72	33.86	1.92
11/18	12.33	11.19	12.18	6/20	4.01	34.84	4.20
12/18	8.10	12.77	8.02	7/20	16.11	35.79	16.28
1/19	16.49	14.31	16.46	8/20	0.33	36.72	0.45
2/19	3.81	15.80	3.78	9/20	5.06	37.63	4.98
3/19	8.37	17.24	8.45	10/20	5.58	38.52	5.53
4/19	11.12	18.65	11.02	11/20	5.55	39.39	5.54
5/19	2.41	20.02	2.55	12/20	16.52	40.23	16.48
6/19	6.79	21.34	6.97	1/21	1.01	41.06	0.92
7/19	7.33	22.64	7.15	MAPE	10.17	21.97	10.05
8/19	15.55	23.90	15.38	H(π)	1.556	1.552	1.556

(Market share data source: http://xl.16888.com/f/57420/).