Table 4 Coefficients of the regression...

Table 4

Coefficients of the regression model with influence of explanatory variables on roughness depth R_z

Term	Coefficient	Standard error	T-Value	Variance inflation factor
Const.	50.42	4.70	10.72	–
$h_{l} / w_{s}$	−32.06	5.40	−5.94	13.77
w_s	−93.2	14.6	−6.39	53.46
${w_{s}}^{2}$	64.1	12.3	5.20	50.43
$h_{l} / w_{s} \cdot w_{s}$	107.53	8.87	12.12	20.08

Term	Coefficient	Standard error	T-Value	Variance inflation factor
Const.	50.42	4.70	10.72	–
$h_{l} / w_{s}$	−32.06	5.40	−5.94	13.77
w_s	−93.2	14.6	−6.39	53.46
${w_{s}}^{2}$	64.1	12.3	5.20	50.43
$h_{l} / w_{s} \cdot w_{s}$	107.53	8.87	12.12	20.08

Note(s):

h_l = layer height; w_s = strand width; h_l/w_s = normalized layer height

Source(s): Authors' own work

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