Pure Sample

Contaminated Sample

%

0.2

coef.

0.55

0.52

0.55

0.52

(s.e.)

(0.28)

(0.14)

(0.28)

(0.14)

3

coef.

0.50

0.51

0.50

0.51

(s.e.)

(0.27)

(0.14)

(0.25)

(0.13)

10

coef.

0.50

0.52

0.51

0.21

(s.e.)

(0.29)

(0.14)

(0.23)

(0.42)

20

coef.

0.50

0.50

0.50

-0.13

(s.e.)

(0.27)

(0.13)

(0.15)

(0.89)

25

coef.

0.48

0.51

0.51

-0.16

(s.e.)

(0.27)

(0.14)

(0.15)

(0.93)

30

coef.

0.51

0.53

0.22

-0.17

(s.e.)

(0.27)

(0.14)

(0.40)

(0.94)