Table 2.

Orthogonal array of 4 factors and 3 levels and the analysis of experimental results.

Number of experiments	Factors				Results of experiment F
	A	B	C	D
1	A1	B1	C1	D1	F1
2	A1	B2	C2	D2	F2
3	A1	B3	C3	D3	F3
4	A2	B1	C2	D3	F4
5	A2	B2	C3	D1	F5
6	A2	B3	C1	D2	F6
7	A3	B1	C3	D2	F7
8	A3	B2	C1	D3	F8
9	A3	B3	C2	D1	F9
Analysis of experimental results	I1	I2	I3	I4
	II1	II2	II3	II4
	III1	III2	III3	III4
	Δ1	Δ2	Δ3	Δ4