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

Table 2. 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.
Constant	14.318	^***	0.052	14.428	^***	0.129	lwph²	0.132	^***	0.031	0.084	^***	0.024
Li	0.230	^***	0.053	0.191	^***	0.053	lwcali	0.070		0.044	0.031		0.041
Lo	0.208	^***	0.023	0.126	^***	0.025	lwcalo	-0.028		0.027	-0.009		0.024
Le	0.304	^***	0.039	0.307	^***	0.044	lwcale	-0.062	^*	0.037	-0.028		0.036
Lwca	0.038	^***	0.011	0.035	^***	0.010	lwlali	-0.087		0.088	-0.052		0.071
Lwla	0.373	^***	0.021	0.438	^***	0.018	lwlalo	0.083		0.073	0.039		0.057
Lwph	0.189	^***	0.014	0.143	^***	0.012	lwlale	-0.009		0.081	0.006		0.064
li²	-0.478	^**	0.216	-0.214		0.194	lwphli	0.233	^***	0.070	0.215	^***	0.058
Lilo	-0.033		0.098	-0.062		0.104	lwphlo	-0.011		0.051	0.002		0.042
Lile	0.441	^***	0.151	0.314	^**	0.150	lwphle	-0.223	^***	0.057	-0.236	^***	0.046
lo²	0.326	^**	0.104	0.149	^*	0.088	lt	-0.016		0.015	-0.009		0.010
Lole	-0.042		0.088	-0.104		0.091	lt²	-0.017		0.015	-0.040	^***	0.013
le²	-0.382	^**	0.188	-0.297		0.192	ltli	-0.094	^***	0.029	-0.045	^**	0.023
ltcac²	0.010		0.016	0.000		0.014	ltlo	0.031		0.022	0.022		0.018
Lwcalwla	0.071	^***	0.026	0.067	^***	0.022	ltle	0.032		0.027	0.011		0.023
Lwcalwph	-0.030		0.019	-0.034	^**	0.017	ltlwca	0.014		0.009	0.015	^**	0.007
lwla²	-0.218	^**	0.090	-0.199	^***	0.069	ltlwla	0.051	^**	0.024	0.044	^**	0.020
Lwlalwph	-0.080	^*	0.045	-0.045		0.035	ltlwph	-0.002		0.014	0.013		0.012

^aM-I = Model omitting heterogeneity factors

^bM-II = Model accounting for heterogeneity factors

*significant at 10%

** significant at 5%

*** significant at 1%