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. 2019 Jun 18;14(6):e0218367. doi: 10.1371/journal.pone.0218367

Table 4. Cost frontier and error components estimates.

Variable	M-I^a			M-II^b			Variable	M-I^a			M-II^b
Variable	Coefficient		S.E.	Coefficient		S.E.	Variable	Coefficient		S.E.	Coefficient		S.E.
DH03_REG09				0.176	^**	0.080	DH03_REG13				-0.076	^*	0.040
DH04_REG09				-0.260	^***	0.072	DH04_REG13				0.350	^***	0.066
DH05_REG09				0.380	^***	0.077	DH05_REG13				0.312	^***	0.062
DH01_REG10				0.019		0.040	DH06_REG13				0.447	^***	0.094
DH02_REG10				-0.036		0.033	DH07_REG13				0.320	^***	0.093
DH03_REG10				0.137	^***	0.045	DH01_REG14				0.121	^**	0.053
DH04_REG10				-0.101	^**	0.049	DH01_REG15				-0.003		0.067
DH05_REG10				0.085	^**	0.045	DH02_REG15				-0.040		0.049
DH06_REG10				0.495	^***	0.073	DH01_REG16				-0.089		0.059
DH01_REG11				-0.106	^***	0.038	DH02_REG16				0.086		0.063
DH02_REG11				0.097	^**	0.043	DH03_REG16				0.090		0.064
DH01_REG12				-0.063	^*	0.032
DH02_REG12				0.032		0.040	μ	0.272	^***	0.071	-0.055		0.225
DH03_REG12				0.174	^***	0.060	η	-0.010		0.012	-0.427	^***	0.062
DH04_REG12				0.039		0.069	γ = (σ_u² + σ_v²) / σ²	0.910	^***	0.037	0.936	^**	0.074
DH05_REG12				0.009		0.031
DH01_REG13				-0.131	^**	0.051	Log-likelihood	667.467			896.689
DH02_REG13				-0.097	^**	0.043

^aM-I = Model omitting heterogeneity factors

^bM-II = Model accounting for heterogeneity factors

*significant at 10%

** significant at 5%

*** significant at 1%