Principal Component Analysis Based Dynamic Fuzzy Neural Network for Internal Corrosion Rate Prediction of Gas Pipelines

Table 1

Eigenvalue and cumulative variance contribution.

Principal component	Eigenvalue	Cumulative variance contribution rate
1	7.973	36.52
2	5.222	59.86
3	2.987	80.35
4	1.502	86.62
5	0.412	89.44
6	0.398	92.38
7	0.214	95.95
8	0.177	97.72
9	0.098	99.76
10	0.028	99.89