Modelling Transport in an Interregional General Equilibrium Model with Externalities



Appendix C

I) A model with wage differentials by place of production (data set 1) and explanatory
variables gender, time, education, sector, age, unemployment, and distance is
examined. The squared residuals of the weighted regression (u2) are estimated on the
size of the group (N):

The results are:

______FGLS______

_____WLS_____

_______OLS_______

___________$___________

_______0.01863_______

0.0060891

-0.00079502

t-value of $

_________26.89_________

_________36.53_________

__________-40.9__________

All of the t-values are significant and therefore a group error component could be
present.

II) A model with wage differentials and explanatory variables gender, time, education,
age, unemployment, and distance is examined.

The test described above gives the following results:

______FGLS______

_____WLS_____

______OLS_______

___________$___________

________0.00461________

_______0.00788

-0.00016861

t-value of $

_________9.84_________

________329.21________

________-14.96_________

All of the t-values are significant and therefore a group error component could be
present.

37



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