Table 4.

Fixed effect results for distance dependency from London to other four cities.

Fixed effects:	Estimate	Std. error	t Value
(Intercept)	32.93176	9.59686	3.432
Time	0.74978	2.33046	0.322
Time^2	−0.01015	0.01657	−0.613
Distance	−25.08761	5.01678	−5.001
Population	4.89825	3.93665	1.244
Distance:population	−9.84526	5.32608	−1.848