Table 3 Determinants of technical efficiency of rain-fed crop production in Syria: Tobit regression

Constant

31.015^** (2.34)

0.777^n.s (0.05)

19.530 ^n.s (0.59)

− 76.273^** (− 2.28)

15.528^n.s (0.63)

Ln number of tractors

− 2.811^* (− 2.01)

− 0.802^n.s (− 0.56)

− 3.935 ^n.s (− 1.04)

7.148^* (2.12)

− 1.467^n.s (− 0.58)

Ln fertilizer quantity

0.234^*** (6.03)

0.202^*** (7.36)

0.133 ^n.s (1.81)

0.153^** (2.41)

0.223^*** (3.01)

Ln loans

− 0.017^* (− 2.11)

− 0.014^* (− 2.15)

− 0.035^* (− 1.96)

− 0.044^** (− 3.04)

− 0.017 ^n.s (− 1.33)

Ln number of employees

0.199^n.s (0.52)

0.298^n.s (0.89)

0.423^n.s (0.49)

− 1.350^n.s (− 1.73)

− 0.144^n.s (− 0.19)

Ln soft wheat area

− 0.183 ^n.s (− 1.07)

–

–

–

–

Ln durum wheat area

–

0.295^n.s (1.62)

–

–

–

Ln barley area

–

–

1.505^n.s (1.69)

–

–

Ln lentils area

–

–

–

0.701^** (2.28)

–

Ln chick peas area

–

–

–

–

0.133^n.s (0.52)

Crisis^a

− 0.183^n.s (− 1.69)

− 0.219^** (2.31)

0.177^n.s (0.55)

− 0.797^*** (− 3.29)

− 0.195^n.s (− 1.16)

Sigma

0.065

0.060

0.159

0.127

0.119

Log-likelihood

12.306

15.345

1.386

3.103

2.966