Model

Variable

I

II

III

Exogenous Index (X)

13.386

(3.186)

[0.000]

−28.451

(27.629)

[0.303]

Endogenous Index (N)

−2.361

(7.454)

[0.751]

5.868

(1.424)

[0.000]

Interaction of Exogenous & Endogenous Indices (XxN)

35.047

(33.875)

[0.301]

Social Value Orientation

(slope of resultant vector)

0.402

(0.535)

[0.451]

1.356

(0.780)

[0.082]

0.956

(0.556)

[0.085]

Risk Averse

(=1, =0 otherwise)

0.736

(1.014)

[0.468]

1.305

(1.055)

[0.216]

1.157

(1.117)

[0.300]

Risk Seeking

(=1, =0 otherwise)

0.986

(0.572)

[0.091]

0.515

(0.758)

[0.497]

0.523

(0.664)

[0.431]

Constant

(Pro Self, Risk Neutral Participants)

−4.076

(1.106)

[0.000]

2.037

(5.449)

[0.709]

−4.353

(1.192)

[0.000]

Pseudo R-squared

p-value for χ2-test on Model Significance

0.457

0.001

0.595

0.032

0.567

0.001

Test: the coefficients of X and XxN are not different from zero (the main effect X)

χ2 = 1.08

p = 0.584

Test: the coefficients of N and XxN are not different from zero (the main effect of N)

χ2 = 7.80

p = 0.020