Table 4.
Sensitivity analysis to alternative treatment-effects estimation methods.
| Method | ATT estimates |
CV (%) | |||
|---|---|---|---|---|---|
| IPW | RA | IPWRA | PSM (2NN) | ||
| Dairy gross margin per cow (€ / cow) |
64.61** (32.26) |
64.93* (33.20) |
63.74** (31.74) |
54.22* (32.43) |
8.29 |
| Milk yield per cow (l / cow) |
513.23*** (121.14) |
493.71*** (115.47) |
507.72*** (112.72) |
405.57*** (121.67) |
10.48 |
| Agricultural GHG emissions per kg of output (kg of CO2e / kg of FPCM) |
−0.020 (0.022) |
−0.024 (0.023) |
−0.028 (0.021) |
−0.029 (0.031) |
16.29 |
| BTSCC (‘000 cells / ml) |
−32.61** (9.44) |
−27.77*** (8.52) |
−32.99** (8.89) |
−38.86*** (11.02) |
13.73 |
Notes: ATTs and standard errors in parentheses. Coefficients of Variation (CV) calculated as a ratio of the standard deviation to the mean for the results of each indicator. IPW = Inverse-Probability Weighting; RA = Regression Adjustment; IPWRA = Inverse-Probability-Weighted Regression Adjustment; PSM = Propensity Score Matching; NN = Nearest-Neighbour. ***, **, and * significant at the 1%, 5%, and 10% level, respectively.