Hi there,

I seem to be having problems using the teffects ipwra command resulting in models leading to non-convergence. Other models continue producing iterations indefinitely up to +100 iterations while saying all the iterations are (not concave). I've been reading on the forums about ways to troubleshoot these issues but it seems like there are many ways the models can fail depending upon the data structure and the teffects command your using so I'd appreciate some general direction troubleshooting my issues.

My dataset is a merge of the Demographic and Health Survey dataset for a West-African country combined with geographic data about local informal mining to examine the effects of local mining activity on children's health and welfare.

Alongside this post I'll attach the code I've been using to run the models and the stata output. Any help you could offer would be greatly appreciated.

. teffects ipwra (nt_ch_micro_vaf i.b4 bord v106 i.urban_rural i.v101 i.b1 i.interview_year, logit) (nearAllArtisi
> nal10k v106 i.urban_rural i.v101) if nearFormal10k == 0, atet

Iteration 0: EE criterion = 3.038e-12 (not concave)
Iteration 1: EE criterion = 1.057e-12 (not concave)
Iteration 2: EE criterion = 6.929e-13 (not concave)
Iteration 3: EE criterion = 5.280e-13 (not concave)
Iteration 4: EE criterion = 4.021e-13 (not concave)
Iteration 5: EE criterion = 3.365e-13 (not concave)
Iteration 6: EE criterion = 2.879e-13 (not concave)
Iteration 7: EE criterion = 2.481e-13 (not concave)
Iteration 8: EE criterion = 2.228e-13 (not concave)
Iteration 9: EE criterion = 1.851e-13 (not concave)
Iteration 10: EE criterion = 1.604e-13 (not concave)
Iteration 11: EE criterion = 1.466e-13 (not concave)
Iteration 12: EE criterion = 1.348e-13 (not concave)
Iteration 13: EE criterion = 1.236e-13 (not concave)
Iteration 14: EE criterion = 1.137e-13 (not concave)
Iteration 15: EE criterion = 1.050e-13 (not concave)
Iteration 16: EE criterion = 9.696e-14 (not concave)
Iteration 17: EE criterion = 8.963e-14 (not concave)
Iteration 18: EE criterion = 8.297e-14 (not concave)
Iteration 19: EE criterion = 7.688e-14 (not concave)
Iteration 20: EE criterion = 7.129e-14 (not concave)
Iteration 21: EE criterion = 6.616e-14 (not concave)
Iteration 22: EE criterion = 6.145e-14 (not concave)
Iteration 23: EE criterion = 5.711e-14 (not concave)
Iteration 24: EE criterion = 5.312e-14 (not concave)
Iteration 25: EE criterion = 4.944e-14 (not concave)
Iteration 26: EE criterion = 4.606e-14 (not concave)
Iteration 27: EE criterion = 4.293e-14 (not concave)
Iteration 28: EE criterion = 4.005e-14 (not concave)
Iteration 29: EE criterion = 3.739e-14 (not concave)
Iteration 30: EE criterion = 3.493e-14 (not concave)
Iteration 31: EE criterion = 3.267e-14 (not concave)
Iteration 32: EE criterion = 3.057e-14 (not concave)
Iteration 33: EE criterion = 2.864e-14 (not concave)
Iteration 34: EE criterion = 2.685e-14 (not concave)
Iteration 35: EE criterion = 2.520e-14 (not concave)
Iteration 36: EE criterion = 2.367e-14 (not concave)
Iteration 37: EE criterion = 2.225e-14 (not concave)
Iteration 38: EE criterion = 2.095e-14 (not concave)
Iteration 39: EE criterion = 1.974e-14 (not concave)
Iteration 40: EE criterion = 1.862e-14 (not concave)
Iteration 41: EE criterion = 1.758e-14 (not concave)
Iteration 42: EE criterion = 1.662e-14 (not concave)
Iteration 43: EE criterion = 1.574e-14 (not concave)
Iteration 44: EE criterion = 1.491e-14 (not concave)
Iteration 45: EE criterion = 1.415e-14 (not concave)
Iteration 46: EE criterion = 1.345e-14 (not concave)
Iteration 47: EE criterion = 1.279e-14 (not concave)
Iteration 48: EE criterion = 1.219e-14 (not concave)
Iteration 49: EE criterion = 1.163e-14 (not concave)
Iteration 50: EE criterion = 1.111e-14 (not concave)
Iteration 51: EE criterion = 1.062e-14 (not concave)
Iteration 52: EE criterion = 1.017e-14 (not concave)
Iteration 53: EE criterion = 9.759e-15 (not concave)
Iteration 54: EE criterion = 9.373e-15 (not concave)
Iteration 55: EE criterion = 9.015e-15 (not concave)
Iteration 56: EE criterion = 8.683e-15 (not concave)
Iteration 57: EE criterion = 8.374e-15 (not concave)
Iteration 58: EE criterion = 8.087e-15 (not concave)
Iteration 59: EE criterion = 7.820e-15 (not concave)
Iteration 60: EE criterion = 7.573e-15 (not concave)
Iteration 61: EE criterion = 7.342e-15 (not concave)
Iteration 62: EE criterion = 7.128e-15 (not concave)
Iteration 63: EE criterion = 6.929e-15 (not concave)
Iteration 64: EE criterion = 6.743e-15 (not concave)
Iteration 65: EE criterion = 6.570e-15 (not concave)
Iteration 66: EE criterion = 6.409e-15 (not concave)
Iteration 67: EE criterion = 6.260e-15 (not concave)
Iteration 68: EE criterion = 6.120e-15 (not concave)
Iteration 69: EE criterion = 5.990e-15 (not concave)
Iteration 70: EE criterion = 5.868e-15 (not concave)
Iteration 71: EE criterion = 5.755e-15 (not concave)
Iteration 72: EE criterion = 5.649e-15 (not concave)
Iteration 73: EE criterion = 5.550e-15 (not concave)
Iteration 74: EE criterion = 5.457e-15 (not concave)
Iteration 75: EE criterion = 5.371e-15 (not concave)
Iteration 76: EE criterion = 5.290e-15 (not concave)
Iteration 77: EE criterion = 5.214e-15 (not concave)
Iteration 78: EE criterion = 5.143e-15 (not concave)
Iteration 79: EE criterion = 5.076e-15 (not concave)
Iteration 80: EE criterion = 5.014e-15 (not concave)
Iteration 81: EE criterion = 4.955e-15 (not concave)
Iteration 82: EE criterion = 4.900e-15 (not concave)
Iteration 83: EE criterion = 4.848e-15 (not concave)
Iteration 84: EE criterion = 4.800e-15 (not concave)
Iteration 85: EE criterion = 4.754e-15 (not concave)
Iteration 86: EE criterion = 4.710e-15 (not concave)
Iteration 87: EE criterion = 4.669e-15 (not concave)
Iteration 88: EE criterion = 4.631e-15 (not concave)
Iteration 89: EE criterion = 4.594e-15 (not concave)
Iteration 90: EE criterion = 4.560e-15 (not concave)
Iteration 91: EE criterion = 4.527e-15 (not concave)
Iteration 92: EE criterion = 4.496e-15 (not concave)
Iteration 93: EE criterion = 4.467e-15 (not concave)
Iteration 94: EE criterion = 4.439e-15 (not concave)
Iteration 95: EE criterion = 4.412e-15 (not concave)
Iteration 96: EE criterion = 4.387e-15 (not concave)
Iteration 97: EE criterion = 4.363e-15 (not concave)
Iteration 98: EE criterion = 4.339e-15 (not concave)
Iteration 99: EE criterion = 4.317e-15 (not concave)
Iteration 100: EE criterion = 4.296e-15 (not concave)
Iteration 101: EE criterion = 4.276e-15 (not concave)
Iteration 102: EE criterion = 4.256e-15 (not concave)
Iteration 103: EE criterion = 4.238e-15 (not concave)
Iteration 104: EE criterion = 4.220e-15 (not concave)
Iteration 105: EE criterion = 4.202e-15 (not concave)
Iteration 106: EE criterion = 4.186e-15 (not concave)
Iteration 107: EE criterion = 4.169e-15 (not concave)
Iteration 108: EE criterion = 4.154e-15 (not concave)
--Break--
teffects ipwra (nt_ch_wast i.b4 bord v106 i.urban_rural i.v101 i.b1 i.birth_year, logit) (nearAllArtisinal10k v1
> 06 i.urban_rural i.v101) if nearFormal10k == 0, atet

Iteration 0: EE criterion = 7.161e-06
Iteration 1: EE criterion = 1.586e-08
Iteration 2: EE criterion = 1.580e-09
convergence not achieved
The Gauss-Newton stopping criterion has been met but missing standard errors indicate some of the parameters
are not identified.

Treatment-effects estimation Number of obs = 14,357
Estimator : IPW regression adjustment
Outcome model : logit
Treatment model: logit
-------------------------------------------------------------------------------------
| Robust
nt_ch_wast | Coef. Std. Err. z P>|z| [95% Conf. Interval]
--------------------+----------------------------------------------------------------
ATET |
nearAllArtisinal10k |
(1 vs 0) | -.0157823 .0128091 -1.23 0.218 -.0408877 .0093231
--------------------+----------------------------------------------------------------
POmean |
nearAllArtisinal10k |
0 | .1147267 .0051582 22.24 0.000 .1046169 .1248366
-------------------------------------------------------------------------------------
Warning: convergence not achieved