Table 8 The stability of efficiency...

Table 8

The stability of efficiency across k-year intervals

k-year	1	2	3	4	5	6	7	8	9	10	11	12
DEA All	0.740*	0.569	0.509	0.418	0.366	0.349	0.376	0.296	0.268	0.207	0.116	−0.036
DEA Years	0.541	0.431	0.370	0.270	0.235	0.199	0.067	0.071	0.053	0.025	0.021	−0.317
DEA Groups	0.752	0.663	0.612	0.537	0.512	0.524	0.588	0.541	0.483	0.477	0.309	0.102
DEA Both	0.722	0.524	0.430	0.388	0.341	0.285	0.264	0.206	0.245	0.231	0.245	0.162
SFA All	1.000	1.000	0.999	0.999	0.998	0.997	0.997	0.996	0.995	0.993	0.991	0.989
SFA Years	0.235	0.125	0.029	−0.042	0.018	0.029	−0.021	0.050	0.019	0.162	0.024	−0.305
SFA Groups	0.997	0.990	0.981	0.970	0.958	0.944	0.929	0.911	0.890	0.867	0.848	0.801
SFA Both	0.200	0.082	0.120	0.045	0.077	0.116	0.055	0.066	0.064	0.180	0.170	0.284

k-year	1	2	3	4	5	6	7	8	9	10	11	12
DEA All	0.740*	0.569	0.509	0.418	0.366	0.349	0.376	0.296	0.268	0.207	0.116	−0.036
DEA Years	0.541	0.431	0.370	0.270	0.235	0.199	0.067	0.071	0.053	0.025	0.021	−0.317
DEA Groups	0.752	0.663	0.612	0.537	0.512	0.524	0.588	0.541	0.483	0.477	0.309	0.102
DEA Both	0.722	0.524	0.430	0.388	0.341	0.285	0.264	0.206	0.245	0.231	0.245	0.162
SFA All	1.000	1.000	0.999	0.999	0.998	0.997	0.997	0.996	0.995	0.993	0.991	0.989
SFA Years	0.235	0.125	0.029	−0.042	0.018	0.029	−0.021	0.050	0.019	0.162	0.024	−0.305
SFA Groups	0.997	0.990	0.981	0.970	0.958	0.944	0.929	0.911	0.890	0.867	0.848	0.801
SFA Both	0.200	0.082	0.120	0.045	0.077	0.116	0.055	0.066	0.064	0.180	0.170	0.284

Note(s): *Each coefficient in this table represents the average correlation of the pairs of efficiency scores separated by k-years (k = 1, 2, …, 12) for each methodology across a 13-year period (2005–2017). Corresponding to each k-, the coefficient is reported as the mean of the (13-k) the correlation coefficients of the efficiency pairs with the interval of k-year. All correlation coefficients are significant at the 1% level

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