Variable
|
Convectional SPF
|
Sample selection SPF
|
---|
Pooled
|
Irrigation only
|
Rainfed only
|
Pooled—sample
|
Irrigation
|
Rainfed
|
---|
Coef.
|
Std. Err.
|
Coef.
|
Std. Err.
|
Coef.
|
Std. Err.
|
Coef.
|
Std. Err.
|
Coef.
|
Std. Err.
|
Coef.
|
Std. Err.
|
---|
Const.
|
3.988c
|
0.044
|
3.944c
|
0.062
|
4.053c
|
0.063
|
3.970c
|
0.066
|
3.942c
|
0.023
|
4.007c
|
0.114
|
Farm size
|
0.920c
|
0.074
|
1.205c
|
0.011
|
1.283c
|
0.095
|
0.923c
|
0.084
|
1.336c
|
0.034
|
1.144
|
0.122
|
Labour
|
0.067a
|
0.04
|
0.044
|
0.071
|
0.256c
|
0.093
|
0.069
|
0.053
|
0.023
|
0.018
|
0.11
|
0.102
|
Seed
|
− 0.235c
|
0.027
|
− 0.157c
|
0.045
|
− 0.235c
|
0.051
|
− 0.158c
|
0.034
|
− 0.153c
|
0.016
|
− 0.107
|
0.08
|
Fertilizer
|
− 0.014
|
0.047
|
0.053
|
0.108
|
− 0.127b
|
0.057
|
− 0.018
|
0.049
|
0.132c
|
0.028
|
− 0.071
|
0.113
|
Herbicide
|
0.124a
|
0.064
|
− 0.266
|
0.221
|
− 0.074
|
0.102
|
0.062
|
0.081
|
− 0.520c
|
0.047
|
− 0.076
|
0.138
|
Farm size2
|
0.076c
|
0.026
|
0.183c
|
0.042
|
− 0.071b
|
0.035
|
0.013
|
0.02
|
0.224c
|
0.01
|
− 0.085b
|
0.036
|
Labour2
|
− 0.0198
|
0.017
|
− 0.0187
|
0.017
|
0.025
|
0.03
|
− 0.014
|
0.02
|
− 0.0098a
|
0.005
|
0.0022
|
0.038
|
Seed2
|
− 0.046c
|
0.006
|
− 0.014
|
0.01
|
− 0.060c
|
0.011
|
− 0.044c
|
0.007
|
− 0.012c
|
0.002
|
− 0.036b
|
0.015
|
Fertilizer2
|
0.004
|
0.011
|
0.006
|
0.014
|
− 0.025
|
0.015
|
− 0.012
|
0.009
|
0.051c
|
0.007
|
− 0.0277
|
0.035
|
Herbicide2
|
− 0.033
|
0.03
|
0.104
|
0.073
|
− 0.022
|
0.034
|
− 0.054
|
0.037
|
0.145c
|
0.022
|
− 0.04223
|
0.061
|
Farm sizeaLabour
|
0.0756
|
0.058
|
− 0.009
|
0.066
|
0.207a
|
0.125
|
0.066
|
0.067
|
− 0.052b
|
0.021
|
0.26375a
|
0.142
|
Farm sizeaSeed
|
− 0.036
|
0.048
|
− 0.069
|
0.056
|
− 0.085
|
0.064
|
0.0097
|
0.049
|
− 0.071c
|
0.017
|
− 0.06171
|
0.089
|
Farm sizeaFertilizer
|
− 0.234c
|
0.072
|
0.175a
|
0.09
|
0.009
|
0.102
|
0.235c
|
0.072
|
0.173c
|
0.027
|
− 0.17683
|
0.139
|
Farm sizeaHerbicide
|
− 0.013
|
0.088
|
− 0.379b
|
0.151
|
0.159
|
0.11
|
0.182c
|
0.066
|
0.473c
|
0.042
|
0.28069b
|
0.123
|
LabouraSeed
|
0.049a
|
0.027
|
0.026
|
0.034
|
− 0.145c
|
0.051
|
− 0.038
|
0.034
|
0.0063
|
0.008
|
− 0.09272
|
0.065
|
LabouraFertilizer
|
0.037
|
0.052
|
− 0.034
|
0.073
|
− 0.012
|
0.068
|
0.072
|
0.059
|
− 0.016
|
0.021
|
0.05588
|
0.105
|
LabouraHerbicide
|
− 0.065
|
0.063
|
− 0.075
|
0.074
|
− 0.02
|
0.125
|
− 0.087
|
0.07
|
− 0.036
|
0.025
|
− 0.1116
|
0.133
|
SeedaFertilizer
|
0.091b
|
0.036
|
− 0.055
|
0.069
|
0.214c
|
0.06
|
0.132c
|
0.04
|
− 0.093c
|
0.017
|
0.20680b
|
0.103
|
SeedaHerbicides
|
0.131c
|
0.046
|
0.06
|
0.086
|
0.178c
|
0.058
|
0.056
|
0.054
|
0.071c
|
0.022
|
0.08807
|
0.082
|
FertilizeraHerbicide
|
0.042
|
0.073
|
− 0.288b
|
0.117
|
− 0.151
|
0.093
|
0.03
|
0.074
|
− 0.458c
|
0.035
|
− 0.01806
|
0.139
|
RTS
|
0.86
| |
0.88
| |
1.10
| |
0.88
| |
0.82
| |
1.00
| |
L. Likelihood
|
− 362.855
|
− 35.986
|
− 235.691
|
− 671.929
|
− 187.078
|
− 408.302
|
gamma(γ)
|
0.947
|
0.969
|
0.972
| | | | | | |
lambda(λ)
| | | | | | |
2.056
|
9.093
|
1.324
|
σ(u)
|
4.212c
|
0.525
|
5.618c
|
1.593
|
5.866c
|
1.336
|
0.689c
|
0.047
|
0.644c
|
0.012
|
0.627c
|
0.098
|
σ (v)
|
0.807c
|
0.001
|
0.503c
|
0.002
|
0.907c
|
0.002
|
0.335c
|
0.031
|
0.071c
|
0.01
|
0.474c
|
0.06
|
Selectivity bias (ρw,v)
| | | | | | |
0.727c
|
0.085
|
0.99998c
|
0.001
|
0.823c
|
0.092
|
N
|
538
|
223
|
315
|
538
|
223
|
315
|
- a, b and c represent 10%, 5% and 1% level of significance, respectively
- Source: Analysis of field data, 2017