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