Table 2.

Regression results (family size and composition). Dependent variable = kWh/day.

Explanatory Variables	Model	Model 2	Model 3
Intercept	−10.450	−12.520	−9.491
Intercept	(9.622)	(9.608)	(9.747)
Family size	3.390^{^z}
Family size	(0.474)
# Females		5.250^{^z}
# Females		(0.786)
# Males		2.394^{^z}
# Males		(0.607)
12 or under			4.014^{^z}
12 or under			(0.616)
13–24			0.640
13–24			(1.081)
25–60			1.716
25–60			(1.153)
Over 60			0.847
Over 60			(1.196)
Living area	0.013^{^z}	0.013^{^z}	0.013^{^z}
Living area	(0.001)	(0.001)	(0.001)
House age	0.103y	0.108^{^y}	0.145^{^z}
House age	(0.046)	(0.046)	(0.047)
# floors	1.974^{^x}	2.231y	2.099^{^y}
# floors	(1.066)	(1.063)	(1.063)
Elec. Cooking	−1.172	−1.421	−1.025
Elec. Cooking	(1.285)	(1.283)	(1.299)
Elec. H₂O heat	4.547^{^z}	4.569^{^z}	4.007^{^z}
Elec. H₂O heat	(0.979)	(0.976)	(0.999)
Window AC	4.115	4.375^{^x}	5.437^{^y}
Window AC	(2.675)	(2.660)	(2.727)
Laundry loads/wk	1.076^{^z}	1.085^{^z}	1.142^{^z}
Laundry loads/wk	(0.169)	(0.168)	(0.169)
Second Freezer	2.475^{^z}	2.807^{^z}	2.945^{^z}
Second Freezer	(0.959)	(0.959)	(0.980)
Swimming pool	21.010^{^z}	20.84^{^z}	21.179^{^z}
Swimming pool	(1.761)	(1.757)	(1.763)
Average humidity	0.133	0.138	0.150
Average humidity	(0.127)	(0.126)	(0.126)
Daytime temp. diff. (mean)	2.233^{^z}	2.224^{^z}	2.208^{^z}
Daytime temp. diff. (mean)	(0.085)	(0.085)	(0.085)
Percent shade	−0.159^{^z}	−0.163^{^z}	−0.164^{^z}
Percent shade	(0.029)	(0.029)	(0.029)
Adj. r²:	0.5932	0.5962	0.5964
F-statistic:	170.3	160.1	140.4
N^{^w}:	1510	1510	1510

↵^zsignificant at 0.01 level
↵^ysignificant at 0.05 level
↵^xsignificant at 0.10 level
↵^wThe total number of observations for five summer months during two years was 1,510. A number of participants, out of 160, reported only one year worth of electricity data because they occupied the house only during the study year. Due to differences in monthly observations between the two years, the total number of observations is 1,510 not 1,600.