Table 5: Sensitivity analysis with Rosenbaum’s bounds on probability values on farm size and expenditure on variable inputs.

Upper bounds on the significance level for different values of

Using the single closest neighbour
Farm size0.00010.00720.08710.3270.6324
Expenditure on variable inputs<0.0001<0.00010.00180.02110.1009

Using all neighbours within a calliper of 0.01
Farm size0.00050.02550.18840.5050.785
Expenditure on variable inputs<0.0001<0.00010.00150.01710.0832

Using a biweight kernel function and a smoothing parameter of 0.06
Farm size0.00010.0120.12540.41310.7202
Expenditure on variable inputs<0.0001<0.00010.00010.0030.023

Source: author’s calculations.