Coefficient estimates:
Coefficient estimates for θ: 
   +0.008815 (   +0.001278)    +6.897747 log_inc * msrp
   +0.427595 (   +0.022550)   +18.962203 fam_size * van
   -1.971179 (   +0.077072)   -25.575946 urban * truck
   +0.764683 (   +0.062750)   +12.186123 log_inc
   +0.982844 (   +0.048368)   +20.319964 rc on log_mpg
   +0.974187 (   +0.547229)    +1.780218 rc on suv
Coefficient estimates for β: 
  -79.935814 (   +3.891643)   -20.540375 constant
   +2.602413 (   +0.313930)    +8.289792 log_mpg
   +3.987562 (   +0.481028)    +8.289662 log_hp
   +1.587037 (   +0.805724)    +1.969704 log_footprint
   +3.222776 (   +0.717337)    +4.492692 log_curbweight
   -0.823633 (   +0.503755)    -1.634988 suv
   -1.823829 (   +0.214584)    -8.499385 van
   +0.600752 (   +0.187475)    +3.204439 truck
   -0.217305 (   +0.019403)   -11.199408 msrp
   +1.218921 (   +0.208453)    +5.847468 dum_year_1981
   +1.343129 (   +0.227260)    +5.910094 dum_year_1982
   +1.737893 (   +0.214812)    +8.090295 dum_year_1983
   +1.780659 (   +0.215110)    +8.277918 dum_year_1984
   +2.269319 (   +0.207648)   +10.928673 dum_year_1985
   +2.008248 (   +0.200769)   +10.002781 dum_year_1986
   +2.142109 (   +0.196378)   +10.908106 dum_year_1987
   +1.592354 (   +0.182910)    +8.705681 dum_year_1988
   +1.086184 (   +0.175243)    +6.198177 dum_year_1989
   +0.625730 (   +0.167851)    +3.727893 dum_year_1990
   +0.246698 (   +0.166630)    +1.480512 dum_year_1991
   +0.210384 (   +0.163473)    +1.286967 dum_year_1992
   +0.368846 (   +0.164097)    +2.247724 dum_year_1993
   +0.468082 (   +0.163375)    +2.865084 dum_year_1994
Convergence criteria:
                       minimum: 79228.04363480539
                    iterations: 15
       iteration_limit_reached: false
                     converged: true
                   f_converged: true
                   g_converged: false
                   x_converged: false
                       f_calls: 16
                       g_calls: 16
                       h_calls: 12
                f_trace (last): 79228.04363480539
           g_norm_trace (last): 0.001750192894575786
                x_trace (last): [1.5360050927891256, 0.3578526999422625, -0.5350076389449608, 0.8038849131119208, 2.2451627711080007, -0.06903584664766882]
                      time_run: 792.0562131404877
