Table 8 Validity tests of instruments
From: Nonfarm activity and market participation by farmers in Ghana
Outcome | Test | Â |
|---|---|---|
| Â | Under-identification | Over-identification |
|  | Kleibergen–Paap LM statistic | Hansen J statistic |
Sales quantity (kg) | 11.946*** | 2.369 (0.124) |
Sales value (GHS) | 0.249 (0.618) | |
Inorganic fertiliser | 0.763 (0.383) | |
Seed | 0.724 (0.127) | |
Insecticide | 1.373 (0.241) | |
Herbicide | 0.073 (0.787) | |
Productivity | 0.059 (0.808) |