Research on a Machine Learning-Based Method for Assessing the Safety State of Historic Buildings

Table 5

The relationship between the number of principal components extracted of KCCA and the monitoring model.

Number of principal components	Cumulative contribution (%)	Average absolute error (mm)
1	25.9	8.14
2	36.78	6.68
3	45.27	2.62
4	52.87	2.31
5	60.1	1.81
7	65.32	0.94
10	69.27	0.59
11	72.57	0.96
12	75.52	0.88
13	77.68	1.11
14	79.74	0.83