Analysis of Window Components Affecting U-Value Using Thermal Transmittance Test Results and Multiple Linear Regression Analysis

Table 6

Result of regression analysis: influences of each independent variable on U-value.

Variables	Single window				Double window
	B	β	t	Significance	B	β	t	Significance
(Constant)	2.718		16.524	0.000	2.384		8.659	0.000
FR_1	−0.032	−0.017	−0.422	0.673	0.038	0.010	0.118	0.906
FR_2	0.064	0.008	0.240	0.810	—	—	—	—
FR_3	0.228	0.061	1.776	0.077	—	—	—	—
FR_4	0.057	0.058	0.994	0.321	0.428	0.774	7.722	0.000
FR_5	−0.165	−0.173	−3.484	0.001	0.194	0.333	3.705	0.000
OP_1	−0.320	−0.359	−3.576	0.000	—	—	—	—
OP_2	0.086	0.085	1.048	0.295	—	—	—	—
OP_3	−0.168	−0.175	−1.801	0.073	−0.061	−0.023	−0.253	0.801
OP_4	−0.232	−0.056	−1.441	0.151	—	—	—	—
OP_5	0.867	0.148	3.894	0.000	—	—	—	—
FR_WIDTH	—	—	—	—	−0.005	−0.393	−5.274	0.000
GL_LE1	−0.036	−0.114	−2.977	0.003	−0.046	−0.383	−2.799	0.006
GL_AG1	−0.036	−0.469	−5.880	0.000	−0.009	−0.191	−1.651	0.101
GL_CL1	−0.030	−0.161	−2.747	0.006	0.010	0.037	0.406	0.685
GL_AIR1	−0.021	−0.236	−3.031	0.003	−0.009	−0.181	−1.648	0.101
GL_LE2	−0.045	−0.285	−4.302	0.000	0.031	0.204	1.599	0.112
GL_AG2	−0.029	−0.343	−6.085	0.000	−0.030	−0.354	−3.053	0.003
GL_CL2	0.034	0.110	2.864	0.004	0.026	0.235	1.546	0.124
GL_AIR2	−0.049	−0.180	−4.726	0.000	−0.012	−0.160	−1.359	0.176
GL_LE3	−0.096	−0.107	−2.931	0.004	−0.048	−0.127	−1.195	0.234
GL_AG3	—	—	—	—	0.000	−0.002	−0.017	0.986
GL_CL3	0.055	0.085	2.232	0.026	0.029	0.193	1.782	0.077
SP_1	−0.056	−0.051	−0.630	0.529	−0.103	−0.179	−1.036	0.302
SP_2	0.117	0.110	1.309	0.191	−0.082	−0.144	−0.800	0.425