Model of Automobile Parts Sale Prediction Based on Nonlinear Periodic Gray GM(1,1) and Empirical Research

Table 4

Sales predictive results of automotive seats in 2018 (unit: ten thousand).

Month and year	Actual sales	Predictive value
Jan, 2018	18.16	18.15
Feb, 2018	18.10	18.10
Mar, 2018	20.45	20.62
Apr, 2018	18.12	18.08
May, 2018	22.21	22.28
Jun, 2018	22.14	22.34
Jul, 2018	16.32	16.05
Aug, 2018	20.89	20.89
Sept, 2018	27.85	27.92
Oct, 2018	27.41	27.27
Nov, 2018	24.51	24.40
Dec, 2018	25.91	25.99