Table 5.

Truncated Regression Results.

Variables	Lower Bound			Mean	Upper Bound
	0.5%	2.5%	5%		95%	97.5%	99.5%
Intercept	−0.4637	−0.1006	0.0367	0.8755 *	1.6717	1.8531	2.1957
SO2	−0.1873	−0.1003	−0.0471	0.2071	0.4560	0.5053	0.6006
NOx	−0.5549	−0.4793	−0.4235	−0.1686	0.0844	0.1429	0.2650
S&D	0.2810	0.3699	0.4120	0.625 ***	0.8327	0.8740	0.9380
ERev	−1.2147	−0.8538	−0.6824	0.1673	1.0509	1.2095	1.5923
RoadI	−0.0434	−0.0386	−0.0358	−0.0223 **	−0.0086	−0.0055	0.0013
TrainI	−1.3562	−1.2269	−1.1326	−0.6964 **	−0.1557	−0.0352	0.2806
DE	−0.1409	−0.0698	−0.0328	0.1227	0.2735	0.3003	0.3654
DC	−0.0383	0.0219	0.0461	0.1905 **	0.3264	0.3524	0.4199
Year13	−0.0140	0.0407	0.0618	0.1800 ***	0.2922	0.3122	0.3492
Year14	0.0768	0.1248	0.1497	0.2736 ***	0.3919	0.4188	0.4573
Year15	0.2000	0.2531	0.2794	0.4067 ***	0.5273	0.5444	0.5928
${\widehat{\sigma }}_{\epsilon }$	0.1768	0.1883	0.1944	0.2232 ***	0.2498	0.2543	0.2618

Notes: (1) *, **, and *** represent the 10%, 5%, and 1% levels of significance, respectively. (2) Mean (in column 5) is the average estimate obtained from maximum likelihood estimates and the bootstrap set with 2000 replications.