Table 5 Results of SFA analysis
From: The relative efficiency of Iranian’s rural traffic police: a three-stage DEA model
Natural logarithm of variables | Coefficient correlation | Standard error | CI (0.95) | |
|---|---|---|---|---|
Freeway/highway | - 0.04** | 0.01 | −0.07 | −0.02 |
One-way main roads | 0.03* | 0.01 | 0.01 | 0.05 |
Two-way main roads | Due to correlation with One-way main road it has been excluded. | |||
By roads | 0.03* | 0.01 | 0.01 | 0.05 |
Ratio of main road to total roads | 0.03 | 0.01 | −0.01 | 0.06 |
Young population | 0.01 | 0.02 | −0.04 | 0.04 |
Traffic count | 0.19** | 0.02 | 0.16 | 0.23 |
Literacy rate | −0.79* | 0.37 | −1.52 | −0.05 |
Number of households owning motorcycle | 0.08** | 0.02 | 0.05 | 0.12 |
Proportion of household owning car | 0.13 | 0.10 | −0.06 | 0.33 |
Constant coefficient | 1.93 | 1.39 | −0.80 | 4.66 |
Mu | −2.07 | 145.55 | −287.35 | 283.21 |
Ln sig2 | −3.01 | 3.04 | −8.98 | 2.96 |
Ilgtgamma | −2.65 | 46.09 | −92.99 | 87.70 |
Sigma2 | 0.05 | 0.15 | 0.01 | 19.25 |
Gamma | 0.06 | 2.84 | 4.10e – 41 | 1 |
Sigma υ 2 | 0.01 | 0.15 | −0.29 | 0.30 |
Sigma ν 2 | 0.04 | 0.01 | 0.04 | 0.05 |