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

Table 4

Maximum-likelihood estimation with time-invariant inefficiency model.

Variable	Truncated distribution (time-invariant)		Half-normal distribution (time-invariant)
	Coefficient	STD	Coefficient	STD
Constant	−0.916^a	0.987	0.945^c	0.100
FC	0.282	0.829	0.253^a	0.838
FCS	0.393^a	0.856	0.314^a	0.832
LOC	0.146	0.982	0.273^c	0.107
AC	0.194	0.920	0.145	0.968
HR	0.340^a	0.928	0.280	0.999
HOR	0.899	0.978	0.521	0.998
FC^2	0.257^a	0.787	−0.183	0.765
FCS^2	−0.121	0.826	−0.146	0.739
LOC^2	0.132^a	0.959	0.132	0.176
AC^2	0.854	0.895	0.801	0.531
HR^2	−0.271	0.925	−0.238	0.611
HOR^2	0.389^c	0.979	0.332	0.527
FC × FCS	0.764	0.669	0.663	0.648
FC × LOC	−0.139	0.775	0.123	0.498
FC × AC	−0.440^a	0.719	−0.640	0.440
FC × HR	0.663	0.756	−0.704	0.574
FC × HOR	−0.219	0.790	−0.294	0.744
FCS × LOC	0.348^a	0.818	0.357^a	0.590
FCS × AC	−0.988	0.746	0.975	0.433
FCS × HR	0.170	0.774	0.273	0.603
FCS × HOR	−0.350	0.815	−0.359	0.808
LOC × AC	0.810	0.849	0.876	0.211
LOC × HR	0.619^b	0.918	0.723	0.272
LOC × HOR	0.145	0.947	0.149	0.357
AC × HR	0.700	0.838	−0.639^b	0.282
AC × HOR	0.376	0.870	0.380	0.582
HR × HOR	0.342	0.900	0.417	0.418
Sigma	0.837^a	0.056	0.083^a	0.011
Gamma	0.510^a	0.837	0.092^a	0.020
Mu	−0.183^a	0.342	0	0
Eta	0	0.578	0	0
Log-likelihood	71.584		84.638
Mean efficiency	0.930		0.905

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