Crop Diversification and Its Efficiency …
175
Table 8 Estimated coefficients and robust standard errors of the CRS model
Variable
CRS-TE
Constant
−0.075
−0.025
−0.095
−0.155 ** −0.130 * −0.161 **
(0.075)
(0.071)
(0.073)
(0.075)
(0.072)
(0.076)
Ratio wheat cultivation −0.166 ** −0.158 ** −0.136 **
(0.074)
(0.069)
(0.066)
Ratio dates cultivation
0.313 **
0.299 ** 0.311 **
(0.142)
(0.146)
(0.144)
Ratio rice cultivation
−0.162 *
−0.06
(0.088)
(0.069)
Ratio alfalfa cultivation
−0.138 **
−0.064
(0.062)
(0.056)
Ratio sorghum
cultivation
−0.448 ***
−0.292 **
(0.136)
(0.122)
Education of household
head
0.004 *
0.004 *
0.004 *
0.005 **
0.005 ** 0.005 **
(0.002)
(0.002)
(0.002)
(0.002)
(0.002)
(0.002)
Age of household head 0.003 **
0.003 **
0.003 **
0.002 **
0.002 ** 0.002 **
(0.001)
(0.001)
(0.001)
(0.001)
(0.001)
(0.001)
Sex of household head 0.082 *
0.061
0.083 **
0.055
0.046
0.056
(0.041)
(0.046)
(0.041)
(0.035)
(0.040)
(0.037)
Family labor ratio
0.101 *** 0.073 *** 0.076 ***
0.118 *** 0.106 *** 0.109 ***
(0.025)
(0.017)
(0.018)
(0.032)
(0.025)
(0.029)
R 2
0.068
0.078
0.616
0.100
0.103
0.102
No. of observations
187
187
187
187
187
187
Notes Robust standard errors are in parentheses. *, ** and *** indicate statistical significance at
the 10, 5 and 1% levels, respectively
production does not contribute to improve efficiency. Parameters of the intensification of wheat production, represented by Ratio wheat cultivation, are negative and
statistically significant for the CTR-TE equations, whereas they are positive and
not significant for the VRS-TE models. These results also suggest intensification of
wheat cultivation would result in decreased efficiency.
In contrast, the estimated coefficients of the intensification of cultivation of dates,
denoted by Ratio dates cultivation, are positive and statistically significant for the
CRS-TE equation. This suggests that the expansion of date production would improve
efficiency.
We found negative and significant estimates of the parameters of the intensification
of cultivation of rice, alfalfa, and sorghum, as denoted by Ratio rice cultivation,
175
Table 8 Estimated coefficients and robust standard errors of the CRS model
Variable
CRS-TE
Constant
−0.075
−0.025
−0.095
−0.155 ** −0.130 * −0.161 **
(0.075)
(0.071)
(0.073)
(0.075)
(0.072)
(0.076)
Ratio wheat cultivation −0.166 ** −0.158 ** −0.136 **
(0.074)
(0.069)
(0.066)
Ratio dates cultivation
0.313 **
0.299 ** 0.311 **
(0.142)
(0.146)
(0.144)
Ratio rice cultivation
−0.162 *
−0.06
(0.088)
(0.069)
Ratio alfalfa cultivation
−0.138 **
−0.064
(0.062)
(0.056)
Ratio sorghum
cultivation
−0.448 ***
−0.292 **
(0.136)
(0.122)
Education of household
head
0.004 *
0.004 *
0.004 *
0.005 **
0.005 ** 0.005 **
(0.002)
(0.002)
(0.002)
(0.002)
(0.002)
(0.002)
Age of household head 0.003 **
0.003 **
0.003 **
0.002 **
0.002 ** 0.002 **
(0.001)
(0.001)
(0.001)
(0.001)
(0.001)
(0.001)
Sex of household head 0.082 *
0.061
0.083 **
0.055
0.046
0.056
(0.041)
(0.046)
(0.041)
(0.035)
(0.040)
(0.037)
Family labor ratio
0.101 *** 0.073 *** 0.076 ***
0.118 *** 0.106 *** 0.109 ***
(0.025)
(0.017)
(0.018)
(0.032)
(0.025)
(0.029)
R 2
0.068
0.078
0.616
0.100
0.103
0.102
No. of observations
187
187
187
187
187
187
Notes Robust standard errors are in parentheses. *, ** and *** indicate statistical significance at
the 10, 5 and 1% levels, respectively
production does not contribute to improve efficiency. Parameters of the intensification of wheat production, represented by Ratio wheat cultivation, are negative and
statistically significant for the CTR-TE equations, whereas they are positive and
not significant for the VRS-TE models. These results also suggest intensification of
wheat cultivation would result in decreased efficiency.
In contrast, the estimated coefficients of the intensification of cultivation of dates,
denoted by Ratio dates cultivation, are positive and statistically significant for the
CRS-TE equation. This suggests that the expansion of date production would improve
efficiency.
We found negative and significant estimates of the parameters of the intensification
of cultivation of rice, alfalfa, and sorghum, as denoted by Ratio rice cultivation,