Table 1. Sobel test results for significance as mediating variables of property size on production intensity (measured by the raw value of production (VOP) per hectare), controlling for household demographic (measured by age of head of household) and access to credit (measured by whether respondent had accessed credit in last 10 years). Predictors significant at 90% confidence are marked in bold-face type. Coefficients ‘a’ determined by regression of mediator variable against control variables and IV; coefficients ‘b’ determined by regression of DV against mediator and control variables and IV.

  Predicting mediator using IV Predicting DV using mediator and IV    
Mediator Coefficient a Standard error of a Coefficient b Standard error of b t statistic p value
Maintenance Costs (per hectare) -4.1512 1.198 1.5997 0.3355 -2.8039 0.0050
Input costs (per hectare) -0.6032 0.2414 7.8699 1.8149 -2.1650 0.0304
Contracted Labor (per hectare) -0.0314 0.015 152.22 24.7799 -1.9587 0.0502
Family Labor (per hectare) -0.0796 0.0177 35.2011 23.1938 -1.4377 0.1505
Income / Entropy -0.0019 0.0007 -1670.5 423.0107 2.2683 0.0233