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

Table 3

Seasonal variation index (SVI).

Month	SVI	Month	SVI	Month	SVI	Month	SVI
1	0.830981	4	0.827722	7	0.734796	10	1.24856
2	0.828724	5	1.020258	8	0.956497	11	1.117194
3	0.943878	6	1.022932	9	1.278393	12	1.190064