Table 1 Stepwise variable selection on dataset A

(Intercept)

248.7786337

45.4299646

5.476

5.67e−08

<.001

Monday

11.5596282

1.0533831

10.974

<2e−16

<.001

Friday

8.4939099

1.1411012

7.444

2.32e−13

<.001

Saturday

− 8.3012065

1.1525279

− 7.203

1.26e−12

<.001

Sunday

− 10.3104139

2.0117598

-5.125

3.65e−07

<.001

January

2.3137231

1.4929930

1.550

0.121566

N.S.

May

− 3.2596707

1.4369325

− 2.268

0.023540

<.05

August

− 3.3159900

1.3688478

− 2.422

0.015616

<.05

Friday * Spring

6.7473582

2.2399643

3.012

0.002667

<0.01

Sunday * Summer

3.4651415

2.0302316

1.707

0.088216

N.S.

Tuesday * Fall

− 4.7872202

1.7387084

− 2.753

0.006020

<0.01

Thursday * Fall

− 4.4414934

1.7371769

− 2.557

0.010732

<.05

Saturday * Winter

− 5.2470915

2.2009207

− 2.384

0.017334

<.05

Summer vacation week 1 + 2

− 8.0769673

1.7847806

− 4.525

6.85e−06

<.001

Summer vacation week 3 + 4

− 10.5916099

1.8959655

− 5.586

3.09e−08

<.001

Thursday * Summer vacation

3.5492285

2.5010552

1.419

0.156225

N.S.

Friday * Vacation

− 6.5440714

2.9636941

− 2.208

0.027495

<.05

Holiday * Vacation

− 5.0010994

3.2588828

− 1.535

0.125239

N.S.

Monday * Holiday

− 21.0261795

3.6481167

− 5.764

1.14e−08

<.001

Thursday * Holiday

− 21.0240305

5.8145506

− 3.616

0.000316

<.001

Wednesday * Holiday

− 19.0692120

7.1177032

− 2.679

0.007519

<0.01

Friday * Holiday

− 27.1374017

9.8894943

− 2.744

0.006191

<0.01

Carnival

10.7865927

4.1303939

2.612

0.009167

<0.01

Time trend

0.0097392

0.0013999

6.957

6.77e−12

<.001

Sunday * Time trend

− 0.0053839

0.0034610

− 1.557

0.120165

N.S.

Summer vacation * Time trend

− 0.0125371

0.0026263

− 4.772

2.12e−06

<.001

Maximum Temperature

0.0360680

0.0088407

4.080

4.92e−05

<.001

Winter * Mean temperature

− 0.0568999

0.0255135

− 2.527

0.011666

<.05

Radiation

0.0029971

0.0009226

3.249

0.001203

<0.01

Maximum pressure

− 0.0155889

0.0044522

− 3.501

0.000486

<.001

Winter * Maximum pressure

0.0007034

0.0001660

4.238

2.49e−05

<.001

Precipitation duration

0.0407058

0.0162960

2.498

0.012674

<.05

Summer * Precipitation (automatic stations)

− 0.312219

0.0081872

− 3.814

0.000147

<.001

Maximum humidity

− 0.1241583

0.0719627

− 1.725

0.084820

N.S.

Maximum visibility

− 0.0086327

0.0042522

− 2.030

0.042636

<.05

Hours of fog

0.4447461

0.1570946

2.831

0.004744

<.01

Winter * hours of snow

− 1.2095289

0.3781155

− 3.199

0.001429

<.01

Residual standard error

Multiple R-squared

Adjusted R-squared

F-statistic