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Official Journal of the Japan Wood Research Society

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Table 2 Results of regression (n = 90)

From: An experimental study on change of gas permeability depending on pore structures in three species (hinoki, Douglas fir, and hemlock) of softwood

\(Y = \alpha_{0} + \beta_{1} X_{1} + \beta_{2} X_{2} + \beta_{3} X_{3} + \beta_{4} D_{1} + \beta_{5} D_{2} + \varepsilon\)
Variables Panel A Panel B Panel C Panel D
Coef. t-stat. Coef. t-stat. Coef. t-stat. Coef. t-stat. VIF
Intercept − 0.449* − 3.688 0.186* 2.931 2.510* 5.016 1.568* 5.232  
X1 3.000* 9.582 2.251* 5.856 4.082
X2 1.955* 9.135 0.736* 2.869 4.017
X3 − 4.316* − 3.692 − 4.505* − 6.527 1.265
D1, D2 Included Included Included Included
adj.R2 64.10% 63.60% 35.90% 78.40%
F-value 53.966 50.076 17.632 65.543
p-value < 0.001 < 0.001 < 0.001 < 0.001
  1. * Represents significance at 1 percent level. Denotations of variables are the same as in Table 1