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The Official Journal of the Pan-Pacific Association of Input-Output Studies (PAPAIOS)

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Table 8 The econometric parameters estimation results of the C–D and OLS.

From: Analysis of technical efficiency of potato (Solanum tuberosum L.) production in Chilga District, Amhara National Regional State, Ethiopia

Variable Parameter Ordinary least squares Maximum likelihood estimate
Coefficient t-ratio Coefficient t-ratio
Intercept \( \beta_{0} \) 6.85 8.43*** 13.21 72.79***
LnArea \( \beta_{1} \) 0.17 1.64 0.05 0.36
LnDAP \( \beta_{2} \) 0.14 1.01 0.13 2.62**
LnUREA \( \beta_{3} \) 0.05 0.42 − 0.05 − 0.72
LnODE \( \beta_{4} \) 0.19 2.93*** 0.16 3.54***
LnMDE \( \beta_{5} \) − 0.08 − 1.26 − 0.038 − 3.11***
LnSD \( \beta_{6} \) 0.18 2.04** − 0.515 − 5.97***
Inefficiency effect model
 Constant     18.29 8.28***
 Age     − 8.32 − 7.21***
 Educ     0.05 0.23
 HHsze     − 0.06 − 0.27
 Variety     − 0.28 − 1.67*
 DAPtime     − 0.33 − 1.45
 Ureatime     0.07 0.27
 SDtime     − 0.06 − 0.305
 Soilcsn     − 0.14 − 0.66
 Freqcnt     0.06 0.53
 Trngprdn     0.19 1.13
 Trngmkt     − 0.099 − 0.38
 Credit     0.075 0.41
 Dismkt     0.54 3.26***
 TLU     0.12 0.81
 Off     0.12 0.59
Variance parameters
 Sigma-squared \( \sigma^{2} \)    0.37 6.51***
 Gamma \( \varGamma \)    0.99 59,138,266***
 Log likelihood function   − 121.34498   − 91.273621  
 LR     60.142728  
 Return to scale     − 0.263  
 Total sample size \( N \) 150   150  
  1. ***, ** and * represents significance at 1%, 5% and 10% probability levels, respectively
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