Model

(1a)

(2a)

Parameters (z-values)

χ2 (p-values)

Parameters (z-values)

Parameters (z-values)

Constant term

−0.039 (−0.04)

−1.068** (−2.65)

0.598* (2.23)

Author is an economist

0.637 (0.74)

12.27** (0.002)

1.585*** (3.52)

Author is not an economist

−1.028 (−1.28)

−1.617*** (−3.51)

Pseudo R2

0.266

0.251

0.260

Standard error of the regression

0.406

0.409

0.405

Log of the pseudo-likelihood function

−45.532

−46.447

−45.852

Hannan-Quinn criteron

1.088

1.075

1.062