Modeling and Analysis of the Effect of Dip-Spin Coating Process Parameters on Coating Thickness Using Factorial Design Method

Table 3

Estimated effect and coefficients for coating thickness (coded units).

Term	Effect	Coefficient	p value
Constant		6.0362	0.000
A	1.6767	0.8383	0.000
B	0.7092	0.3546	0.000
C	−0.3858	−0.1929	0.000
D	0.6642	0.3321	0.000
AB	0.1767	0.0883	0.001
AC	−0.1450	−0.0725	0.007
AD	0.2033	0.1017	0.000
BC	0.0308	0.0154	0.546
BD	0.0708	0.0354	0.170
CD	−0.0342	−0.0171	0.504
ABC	0.0250	0.0125	0.624
ABD	0.0500	0.0250	0.330
ACD	−0.0150	−0.0075	0.769
BCD	0.1158	0.0579	0.028
ABCD	0.0517	0.0258	0.314
Center point		0.0050	0.550

= 99.76%; Adj. = 96.76%; value of LOF = 0.65; significant at significance level of less than 0.05.