Sludge Bulking Prediction Using Principle Component Regression and Artificial Neural Network

Table 3

Eigenvalue and percentage variance of the 9 principle components for the prediction model.

PC	1	2	3	4	5	6	7	8	9
Eigenvalue	4.3	1.3	1.1	0.9	0.7	0.3	0.2	0.1	0.1
% variance	47.8	14.8	12.5	10.3	7.4	3.6	1.9	1.1	0.6