|
Variable
|
Parameter
|
Local varieties
|
OPVs
|
Hybrids
|
Pooled sample
|
|---|
|
Coefficient
|
std. error
|
Coefficient
|
std. error
|
Coefficient
|
std. error
|
Coefficient
|
std. error
|
|---|
|
Production frontier
|
|
Constant
|
\({\beta }_{0}\)
|
5.535**
|
0.091
|
5.462*
|
0.126
|
5.637**
|
0.118
|
5.610**
|
0.094
|
|
\(\mathrm{ln land}\)
|
\({\beta }_{1}\)
|
0.106**
|
0.018
|
0.105***
|
0.006
|
0.113**
|
0.011
|
0.105***
|
0.007
|
|
\(\mathrm{ln labor}\)
|
\({\beta }_{2}\)
|
0.142***
|
0.024
|
0.171**
|
0.017
|
0.168**
|
0.019
|
0.156**
|
0.020
|
|
\(\mathrm{ln fertilizer}\)
|
\({\beta }_{3}\)
|
0.201*
|
0.106
|
0.209***
|
0.032
|
0.237***
|
0.021
|
0.206***
|
0.014
|
|
\(\mathrm{ln seed}\)
|
\({\beta }_{4}\)
|
0.128**
|
0.035
|
0.138***
|
0.021
|
0.166*
|
0.047
|
0.135***
|
0.017
|
|
Socio-economic variables
|
|
Constant
|
\({\delta }_{0}\)
|
− 2.379
|
0.152
|
− 2.794***
|
0.054
|
− 2.984**
|
0.083
|
− 2.781***
|
0.061
|
|
Age
|
\({\delta }_{1}\)
|
0.003*
|
0.010
|
0.007
|
0.009
|
− 0.031
|
0.015
|
0.002
|
0.006
|
|
Gender
|
\({\delta }_{2}\)
|
− 0.795**
|
0.249
|
− 0.728***
|
0.233
|
− 0.647***
|
0.220
|
− 0.737***
|
0.224
|
|
Education
|
\({\delta }_{3}\)
|
− 0.151***
|
0.048
|
− 0.334**
|
0.084
|
− 0.428*
|
0.131
|
− 0.237***
|
0.060
|
|
Household size
|
\({\delta }_{4}\)
|
− 0.068
|
0.065
|
− 0.032
|
0.052
|
0.074
|
0.214
|
− 0.035
|
0.057
|
|
Coop. membership
|
\({\delta }_{5}\)
|
− 0.144
|
0.311
|
− 0.152
|
0.339
|
− 0.313*
|
0.384
|
− 0.153
|
0.376
|
|
Extension services
|
\({\delta }_{6}\)
|
− 0.135*
|
0.022
|
− 0.021***
|
0.011
|
− 0.019**
|
0.009
|
− 0.027**
|
0.013
|
|
Credit access
|
\({\delta }_{7}\)
|
0.192
|
0.047
|
− 0.354**
|
0.097
|
− 0.213***
|
0.030
|
− 0.272***
|
0.029
|
|
Off− farm income
|
\({\delta }_{8}\)
|
− 0.144
|
0.141
|
− 0.275
|
0.406
|
0.310
|
0.513
|
− 0.112
|
0.112
|
|
Land tenure
|
\({\delta }_{9}\)
|
− 0.326***
|
0.317
|
− 0.352**
|
0.109
|
− 0.285***
|
0.116
|
− 0.302**
|
0.129
|
|
Livestock ownership
|
\({\delta }_{10}\)
|
− 0.801**
|
0.123
|
− 0.723***
|
0.065
|
− 0.476**
|
0.155
|
− 0.716***
|
0.086
|
|
Model diagnostics
|
|
Sigma− u
|
\({\sigma }_{u}\)
|
0.127***
|
0.011
|
0.132***
|
0.009
|
0.122***
|
0.020
|
0.111***
|
0.013
|
|
Sigma− v
|
\({\sigma }_{v}\)
|
0.094***
|
0.013
|
0.079***
|
0.008
|
0.105**
|
0.009
|
0.064***
|
0.006
|
|
Variance
|
\({\sigma }^{2}\)
|
0.025***
|
0.002
|
0.024***
|
0.003
|
0.026**
|
0.001
|
0.016***
|
0.002
|
|
Lambda
|
\(\lambda \)
|
1.351***
|
0.075
|
1.671***
|
0.104
|
1.162***
|
0.022
|
1.718***
|
0.018
|
|
Log likelihood function
|
\(LLF\)
|
− 416.351
| |
− 313.237
| |
− 504.115
| |
− 348.808
| |
|
No. of observations
| |
91
|
202
|
67
|
360
|
- ***, **, and * Statistical significance at the 1%, 5%, and 10% levels, respectively
