A Principal Component Analysis Control Chart Method for Catenary Status Evaluation and Diagnosis

Table 2

Rated value of T² control chart and SPE control chart.

Group no.	T^2	Q	Group no.	T^2	Q
1	3.40	0.14	14	1.61	0.11
2	2.42	0.12	15	3.15	0.17
3	4.13	0.18	16	1.80	0.20
4	5.72	0.21	17	6.36	0.43
5	2.11	0.01	18	4.63	0.02
6	7.31	0.49	19	2.97	0.00
7	1.86	0.13	20	2.40	0.00
8	9.68	0.01	21	9.46	0.16
9	2.00	0.31	22	2.18	0.03
10	2.91	0.07	23	3.10	0.26
11	1.59	0.07	24	1.32	0.52
12	2.49	0.00	25	2.90	0.19
13	8.48	0.04