TABLE 3 One-Way SUR Model for Per Capita Sales in Gasoline Service Stations,,,,
,Initial specification,,Final specification,
,Coefficient,t-stat,Coefficient,t-stat
CONSTANT,4.45E+04,4.56,3.81E+04,6.05
STATE SALES PERCAP,3.04E+00,5.16,3.01E+00,7.1
YEAR,–2.33E+01,–4.54,–1.99E+01,–6.04
YEAR 1982,–3.89E+02,–4.55,–3.92E+02,–4.76
ELDERLY,4.64E+00,0.55,,
UNEMP RATE,1.11E+01,0.76,,
INCOME PERCAP,2.09E–02,0.99,,
LARGECITY POP/DIST,–1.46E–03,–0.27,,
TOT TRAFFIC PERCAP,2.95E+02,8.04,2.97E+02,8.72
RELIEF ROUTE,–2.80E+01,–0.06,–8.83E+01,–0.46
NUM YEARS ,–2.18E+01,–0.92,,
NUM YEARS SQ,7.98E–01,0.86,,
TRAFFIC SPLIT,–4.20E+02,–0.86,–7.57E+02,–1.91
DIST OLD,2.12E+01,0.55,,
DIST RATIO,–1.58E+02,–0.36,,
ACCESS CONTROL,–1.41E+02,–0.97,,
R2adj.,0.30,,0.31,
s2m,5.31E+04,,5.82E+04,
s2n,1.75E+05,,1.73E+05,