(1)

(2)

(3)

index

lnCI

lnCI

index

−0.033**

−0.005**

(0.0135)

(0.0027)

phone

0.011***

(0.0027)

control variables

Yes

Yes

Yes

_cons

Yes

Yes

Yes

city effect

Yes

Yes

Yes

time effect

Yes

Yes

Yes

Kleibergen-Paap rk LM

13.051

Cragg-Donald Wald F

67.001

Kleibergen-Paap rk Wald F

15.469

R²

0.994

0.635

0.679

N

2583

2583

2547