Intercept | −1.543 | −3.504 | −10.750 |
| (9.556) | (9.575) | (9.592) |
Family size | 3.594z | 3.427z | 3.620z |
| (0.463) | (0.467) | (0.477) |
Living area | 0.013z | 0.013z | 0.013z |
| (0.001) | (0.001) | (0.001) |
House age | 0.057 | 0.101y | 0.092y |
| (0.042) | (0.045) | (0.047) |
# floors | 1.416 | 1.793x | 1.828x |
| (1.042) | (1.051) | (1.072) |
Elec. Cooking | −0.912 | −0.761 | −0.609 |
| (1.271) | (1.270) | (1.291) |
Elec. H2O heat | 4.443z | 4.456z | 4.177z |
| (0.969) | (0.967) | (0.981) |
Window AC | 4.530x | 4.428x | 4.648x |
| (2.642) | (2.638) | (2.670) |
Laundry loads/wk | 1.009z | 1.009z | 1.103z |
| (0.168) | (0.167) | (0.168) |
Second Freezer | 2.519z | 2.602z | 2.573z |
| (0.947) | (0.946) | (0.957) |
Swimming pool | 22.223z | 21.539z | 20.470z |
| (1.719) | (1.739) | (1.765) |
Average humidity | 0.013 | 0.037 | 0.127 |
| (0.125) | (0.126) | (0.126) |
Daytime temp. diff. (mean) | 2.155z | 2.192z | 2.218z |
| (0.083) | (0.084) | (0.085) |
Percent shade | | −0.088y | |
| | (0.036) | |
Light shade | −0.254 | 0.43 | |
| (1.431) | (1.457) | |
Moderate shade | −0.507 | 1.197 | |
| (1.289 | (1.469) | |
Heavy shade | −9.174z | −6.884z | |
| (1.356) | (1.655) | |
Late a.m. shade percent | | | 0.020 |
| | | (0.028) |
Early p.m. shade percent | | | −0.005 |
| | | (0.047) |
Late p.m. shade percent | | | −0.117z |
| | | (0.022) |
Adj. r2: | 0.6030 | 0.6043 | 0.5957 |
F-statistic: | 153.8 | 145.0 | 149.2 |
N: | 1510 | 1510 | 1510 |