Table 3: Coefficients of the parametric part of the additive model for NO2 (bold indicates 5% significance).

Est. Std. Er.

(Interc.)4.157781 0.008705
Mon.0.131553 0.008831
Tue.0.122523 0.013177
Wed.0.108691 0.015761
Thu.0.112780 0.015928
Fri.0.112615 0.013356
Sat.0.072378 0.008766