Table 1 Estimation of Frontier Cost Function Parameters (SFA) from the maximum likelihood method (ML)
Variable | Coefficient | Standard-error | t-ratio | |
|---|---|---|---|---|
Intercept | β0 | 3.86 | 0.925 | 4.175 |
log(expert) | β1 | 0.22 | 0.819 | 0.275 |
log(specialist) | β2 | 3.82 | 0.478 | 7.986 |
log(auto‐analyzer) | β3 | − 1.54 | 0.585 | − 2.63 |
log(ELISA) | β4 | − 0.7 | 0.495 | − 1.42 |
log(cell counter) | β5 | 0.58 | 0.567 | 1.028 |
log(incubator) | β6 | 0.15 | 0.39 | 0.381 |
log(centrifuge) | β7 | − 0.62 | 0.657 | − 0.95 |
log(microscope) | β8 | 0.55 | 0.794 | 0.692 |
log(lubricating solution) | β9 | − 1.02 | 0.492 | − 2.08 |
log(isotone solution) | β10 | 1.31 | 0.575 | 2.282 |
log(Hormone kit) | β11 | − 1.45 | 0.503 | − 2.88 |
log(Biochemistry Kit) | β12 | 1.27 | 0.448 | 2.828 |
log(microbial culture medium) | β13 | − 0.63 | 0.345 | − 1.82 |
Sigma-square | σ2 | 1.14 | 0.214 | 5.333 |
Gamma | γ | 1 | 0.0000006 | 1,660,708.2 |
log likelihood | − 20 | |||
LR test | 7.93 | |||