The Measures of Efficiency of Power Generation Plants in Sylhet of Bangladesh

Table 5

Maximum-likelihood estimation with time-variant inefficiency model.

Variable	Truncated distribution (time-varying)		Half-normal distribution (time-varying)
	Coefficient	Standard error	Coefficient	Standard error
Constant	−0.892^a	0.987	0.912^a	0.100
FC	0.275^b	0.829	0.294^b	0.158
FCS	0.287	0.856	0.389^b	0.188
LOC	0.152^b	0.982	0.137	0.176
AC	0.209	0.920	0.188	0.333
HR	0.349	0.928	0.329	0.665
HOR	0.775	0.978	−0.378^a	0.804
FC^2	−0.359	0.787	0.335	0.610
FCS^2	−0.224	0.826	−0.112	0.463
LOC^2	0.139	0.959	0.151^a	0.223
AC^2	0.861	0.895	0.924	0.633
HR^2	−0.236	0.925	−0.255	0.183
HOR^2	0.337	0.979	0.608	0.646
FC × FCS	0.825^a	0.669	0.790	0.349
FC × LOC	−0.237	0.775	−0.123	0.145
FC × AC	−0.470	0.719	−0.422	0.127
FC × HR	−0.646^a	0.756	−0.655^a	0.358
FC × HOR	−0.314	0.790	−0.187	0.414
FCS × LOC	0.719^b	0.818	0.480^a	0.150
FCS × AC	−0.489	0.746	−0.119	0.109
FCS × HR	0.574	0.774	0.163	0.385
FCS × HOR	−0.393	0.815	−0.387	0.434
LOC × AC	0.814	0.849	0.783	0.262
LOC × HR	0.374	0.918	0.583	0.381
LOC × HOR	0.149	0.947	0.148	0.496
AC × HR	0.742^b	0.838	0.737	0.310
AC × HOR	0.325	0.870	0.386^b	0.945
HR × HOR	0.359	0.900	0.350	0.147
Sigma	0.772	0.056	0.108	0.049
Gamma	0.469^a	0.837	0.210^a	0.313
Mu	0.398^c	0.342	0	0
Eta	0.030^a	0.578	0.300^a	0.214
Log-likelihood	75.025		68.483
Mean efficiency	0.9271		0.9028

^aSignificance at the 1% level, ^bsignificance at the 5% level, ^csignificance at the 10% level.