Interaction of Transformer Oil Parameters on Each Other and on Transformer Health Index Using Curve Estimation Regression Method

Table 8

Comparison of two regression methods to predict the relationship between BDV and CH₄ parameters of the transformer.

Equation	Model summary					Parameter estimates
	R-Square	F	df1	df2	Sig	Constant	b1	b2	b3
Cubic	0.216	10.659	3	116	0	69.878	−0.335	0.001	−5.171E − 7
S	0.058	7.299	1	118	0.008	4.006	0.340	—	—

Dependent variable: BDV, independent variable: CH₄