highly significantp≈0.0001
In the full sample (ages 40–75), the first-stage Kleibergen–Paap rk Wald F is ≈9.16 (borderline strength), yet the Anderson–Rubin and Stock–Wright weak-IV-robust tests are highly significant (p≈0.0001), indicating a positive effect of retirement on depressive symptoms under weak-IV-robust inference.