Nonlinear Forecasting Model regarding Evolutional Risk of the PPP Project

Table 2

The original logarithm data of The Yiyang-Loudi High Speed PPP Project.

Year/Quarter
2014/1	1.44	4.59	4.52	4.54
2014/2	1.70	4.60	4.52	4.46
2014/3	1.19	4.61	4.52	4.55
2014/4	2.24	4.56	4.42	4.46
2015/1	2.54	4.52	4.36	4.40
2015/2	2.59	4.51	4.33	4.34
2015/3	2.65	4.51	4.28	4.36
2015/4	1.92	4.55	4.46	4.47
2016/1	1.74	4.57	4.49	4.45
2016/2	1.82	4.55	4.48	4.46
2016/3	2.39	4.54	4.39	4.43
2016/4	2.50	4.53	4.37	4.40
2017/1	2.55	4.52	4.36	4.43
2017/2	2.73	4.50	4.27	4.29
2017/3	2.57	4.51	4.33	4.38
2017/4	2.66	4.52	4.29	4.37