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Table 8 Validity tests of instruments

From: Nonfarm activity and market participation by farmers in Ghana

Outcome Test  
  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)
  1. p values in parenthesis; ***p < 0.01