Table 1.

Comparison of different parametric models.

Model 1	Coefficient	p-Value	R2 = 0.26	AIC = 125,306.1
sine	0.025	<0.001
cosine	0.074	<0.001
Year	−0.014	<0.001
Tue-Sun1	−0.041; 0.004	<0.001; 0.89
Temp	−0.0015	<0.001
Temp-squared	0.0005	<0.001
Rel. Humidity	0.0001	0.138
28-day temp.	−0.010	<0.001
Constant	32.04	<0.001
Model 2	Coefficient	p-Value	R2 = 0.26	AIC = 125,238.9
sine	0.042	<0.001
cosine	0.089	<0.001
Year	−0.018	<0.001
Tue-Sun1	−0.040; 0.004	<0.001; 0.88
Temp	−0.0001	0.882
Temp-squared	0.0004	<0.001
Rel. Humidity	0.0002	0.066
14-day temp.	−0.0097	<0.001
Constant	32.18	<0.001
Model 3	Coefficient	p-Value	R2 = 0.26	AIC = 125,643
sine	0.069	<0.001
cosine	0.150	<0.001
Year	−0.014	<0.001
Tue-Sun 1	−0.041; 0.004	<0.001; 0.90
Temp	−0.0038	<0.001
Temp-squared	0.0005	<0.001
Rel. Humidity	0.0002	0.017
Constant	32.61	<0.001

¹ Compared to Mondays; Tuesdays and Wednesdays have a positive coefficient. Only Saturdays and Sundays differ significantly from Mondays (all models).