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Table 3
Maximum likelihood estimates of the parameters of the stochastic frontier models.
| Parameter | Model 1 | Model 2 |
|---|---|---|
| Weight as dependent variable | Value as dependent variable | |
| Frontier | ||
| ln kW | 8.282*** | 6.625*** |
| (−4.94) | (−4.11) | |
| ln T | 1.063** | 0.975** |
| (−2.26) | (−2.17) | |
| ln kW * ln T | −0.25 | −0.24 |
| (−1.58) | (−1.63) | |
| (ln kW)2 | −1.409*** | −1.115*** |
| (−4.75) | (−3.92) | |
| (ln T)2 | 0.0412** | 0.0870*** |
| (−2.04) | (−4.56) | |
| February | −0.204*** | −0.142** |
| (−3.38) | (−2.47) | |
| March | −0.410*** | −0.216*** |
| (−6.54) | (−3.60) | |
| April | −0.341*** | −0.249*** |
| (−5.51) | (−4.23) | |
| May | −0.413*** | −0.309*** |
| (−6.57) | (−5.12) | |
| June | −0.534*** | −0.527*** |
| (−8.31) | (−8.57) | |
| July | −0.559*** | −0.439*** |
| (−8.40) | (−6.95) | |
| September | −0.372*** | −0.310*** |
| (−5.50) | (−4.81) | |
| October | −0.376*** | −0.283*** |
| (−5.91) | (−4.65) | |
| November | −0.04 | −0.188*** |
| (−0.59) | (−3.05) | |
| December | −0.08 | −0.09 |
| (−1.25) | (−1.58) | |
| Constant | −18.70*** | −12.04*** |
| (−3.89) | (−2.61) | |
| Inefficiency | ||
| ln A | 28.40** | 39.22 |
| (−2.38) | (−1.31) | |
| Length > 24 m | −5.51 | −3.14 |
| (−1.36) | (−0.59) | |
| Constant | −139.0** | −205.80 |
| (−2.39) | (−1.30) | |
| Log-likelihood | −2615.24 | −2534.26 |
| Lambda | 9.6*** | 13.6*** |
| (9.43) | (5.57) |
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