我用frontier4.1估计成本效率,结果效率值居然大于1,我用的方程是
ln(Ci/Zi) = b0 + b1ln(W1) + b2ln(W2) + b3ln(W3)+ b4ln(Yi / Zi) + (Vi + Ui)
coefficient standard-error t-ratio
beta 0 0.86693724E+00 0.70371242E+00 0.12319482E+01
beta 1 0.34459747E+00 0.10297230E+00 0.33465066E+01
beta 2 -0.21954691E+00 0.77239260E-01 -0.28424264E+01
beta 3 0.86256368E-01 0.10417963E+00 0.82795807E+00
beta 4 0.98721124E+00 0.37920063E-01 0.26034009E+02
sigma-squared 0.21665541E+00 0.37240501E-01 0.58177361E+01
gamma 0.27102158E-05 0.34417106E-02 0.78746185E-03
mu is restricted to be zero
eta is restricted to be zero
样本65个
哪位大侠能帮我解释一下,谢谢
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