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# st: Intreg - missing se

 From Simone Boyce <[email protected]> To Stata <[email protected]> Subject st: Intreg - missing se Date Fri, 5 Mar 2004 11:00:16 -0800 (PST)

Hi,

I have panel data on medical expenditures by month by
patient over several years.� Given that many patients
incur no medical expenses in a month, I'm running
intreg in order to be able to correct the standard
errors by clustering�by patient.� As a result,
however, I'm getting missing standard errors on some
variables.� I'm not sure why this is occurring so any
help you can offer would be appreciated.

Thanks,
Simone

An excerpt from my program follows:
Fitting constant-only model:
Iteration 0:�� log likelihood = -14258.243
Iteration 1:�� log likelihood = -14233.651
Iteration 2:�� log likelihood = -14233.611
Iteration 3:�� log likelihood = -14233.611
Fitting full model:
Iteration 0:�� log likelihood = -14120.751
Iteration 1:�� log likelihood = -14092.996
Iteration 2:�� log likelihood = -14092.984
Iteration 3:�� log likelihood = -14092.984
Interval regression
Number of obs�� =������ 1721
������������������������������������������������� Wald
chi2(78)�� =������ 5.90
Log likelihood = -14092.984���������������������� Prob
> chi2���� =���� 1.0000
������������������������������ (standard errors
adjusted for clustering on id)
------------------------------------------------------------------------------
������������ |�������������� Robust
������������ |����� Coef.�� Std. Err.����� z
P>|z|���� [95% Conf. Interval]
-------------+----------------------------------------------------------------
���� max_epo |� -164.6891�� 291.8248��� -0.56
0.573��� -736.6553���� 407.277
���� pre_epo |� -1042.706�� 675.1091��� -1.54
0.122��� -2365.895��� 280.4836
����� n_neph |��� 95.0872��������� .������� .
.����������� .���������� .
vas_access~1 |��� 1.67142�� 1.248917���� 1.34
0.181��� -.7764116��� 4.119251
�� sev_score |�� 554.5703�� 428.4049���� 1.29
0.195���� -285.088��� 1394.229
��� region_1 |�� 4848.412��������� .������� .
.����������� .���������� .
��� region_3 |� -564.5537�� 607.0004��� -0.93
0.352��� -1754.253��� 625.1452
��� region_4 |� -236.4426�� 590.9987��� -0.40
0.689��� -1394.779��� 921.8936
��� region_5 |� -56.82323�� 663.4045��� -0.09
0.932��� -1357.072��� 1243.426
��� region_6 |�� -249.867��� 603.322��� -0.41
0.679��� -1432.356��� 932.6224
��� region_7 |� -83.41191�� 453.3813��� -0.18
0.854���� -972.023��� 805.1991
��� region_8 |� -451.2196�� 629.4874��� -0.72
0.473��� -1684.992��� 782.5531
��� region_9 |�� 942.6939�� 771.1849���� 1.22
0.222��� -568.8008��� 2454.189
���� dlockin |�� 868.6021�� 660.3181���� 1.32
0.188��� -425.5976��� 2162.802
������� dpos |�� 569.1639���� 476.98���� 1.19
0.233��� -365.6997��� 1504.027
������� dppo |�� 670.9701��� 556.107���� 1.21
0.228��� -418.9795���� 1760.92
�������� chf |� -275.1132��� 319.468��� -0.86
0.389��� -901.2591��� 351.0326
������� cirr |��� 2727.54�� 1875.542���� 1.45
0.146��� -948.4542��� 6403.535
��� diabetes |�� 27.53376�� 261.8082���� 0.11
0.916��� -485.6009��� 540.6684
�� hypertnsn |� -372.6621�� 393.7148��� -0.95
0.344��� -1144.329��� 399.0047
������ trans |�� 123.8997�� 380.8696���� 0.33
0.745��� -622.5909��� 870.3904
������ chemo |�� 2092.798�� 1528.352���� 1.37
0.171��� -902.7175��� 5088.313
������� male |�� 181.9483��� 276.749���� 0.66
0.511��� -360.4697��� 724.3663
� ageatindex |�� 71.00932�� 138.2606���� 0.51
0.608��� -199.9765��� 341.9951
������� age2 |� -1.087141��������� .������� .
.����������� .���������� .
�������� mm4 |� -622.5777���� 934.07��� -0.67
0.505��� -2453.321��� 1208.166
�������� mm5 |� -201.6417��������� .������� .
.����������� .���������� .
�������� mm6 |�� 1267.181�� 1191.833���� 1.06
0.288��� -1068.769��� 3603.131
�������� mm7 |�� -857.633�� 951.6563��� -0.90
0.367��� -2722.845��� 1007.579
�������� mm8 |� -965.2743�� 923.6236��� -1.05
0.296��� -2775.543��� 844.9947
�������� mm9 |�� -680.489�� 1053.794��� -0.65
0.518��� -2745.887��� 1384.909
������� mm10 |�� 98.51354�� 565.2734���� 0.17
0.862��� -1009.402��� 1206.429
������� mm11 |� -337.9866�� 768.3633��� -0.44
0.660��� -1843.951��� 1167.978
������� mm12 |� -299.9577�� 763.3312��� -0.39
0.694��� -1796.059��� 1196.144
������� mm13 |�� 3305.261�� 3137.035���� 1.05
0.292��� -2843.215��� 9453.736
������� mm14 |�� 1122.103�� 1143.299���� 0.98
0.326��� -1118.723��� 3362.928
������� mm15 |�� 959.0262�� 1117.877���� 0.86
0.391��� -1231.973��� 3150.025
������� mm16 |�� 1142.147�� 1213.986���� 0.94
0.347��� -1237.222��� 3521.515
������� mm17 |�� 830.9736�� 1068.596���� 0.78
0.437��� -1263.437��� 2925.384
������� mm18 |�� 3722.574�� 4284.308���� 0.87
0.385��� -4674.516��� 12119.66
������� mm19 |� -536.8562�� 672.7107��� -0.80
0.425��� -1855.345��� 781.6326
������� mm20 |� -140.9105�� 671.1563��� -0.21
0.834��� -1456.353��� 1174.532
������� mm21 |��� 1079.41�� 1127.801���� 0.96
0.339��� -1131.039��� 3289.859
������� mm22 |�� 75.58293�� 699.3105���� 0.11
0.914���� -1295.04��� 1446.206
������� mm23 |�� 146.1172�� 847.5345���� 0.17
0.863���� -1515.02��� 1807.254
������� mm24 |�� 237.6426�� 773.9678���� 0.31
0.759��� -1279.306��� 1754.592
������� mm25 |�� 727.6342�� 783.8668���� 0.93
0.353��� -808.7166��� 2263.985
������� mm26 |�� 395.0451�� 688.7651���� 0.57
0.566��� -954.9097������� 1745
������� mm27 |�� 486.1328�� 701.1925���� 0.69
0.488��� -888.1793��� 1860.445
������� mm28 |�� 1248.766�� 1077.945���� 1.16
0.247��� -863.9666��� 3361.499
������� mm29 |�� 714.2825�� 827.6684���� 0.86
0.388��� -907.9178��� 2336.483
������� mm30 |�� 471.1459�� 696.3958���� 0.68
0.499��� -893.7648��� 1836.057
������� mm31 |� -9.212793�� 587.8447��� -0.02
0.987��� -1161.367��� 1142.942
������� mm32 |�� 274.1597�� 590.3528���� 0.46
0.642��� -882.9105���� 1431.23
������� mm33 |�� 212.8656�� 606.9387���� 0.35
0.726��� -976.7125��� 1402.444
������� mm34 |�� 438.5759��� 634.901���� 0.69
0.490��� -805.8072��� 1682.959
������� mm35 |� -105.9359�� 558.4603��� -0.19
0.850��� -1200.498��� 988.6262
������� mm36 |� -179.4214�� 537.0638��� -0.33
0.738��� -1232.047��� 873.2043
������� mm37 |�� 597.0361�� 687.0661���� 0.87
0.385��� -749.5887��� 1943.661
������� mm38 |�� 548.8999�� 673.7504���� 0.81
0.415��� -771.6266��� 1869.426
������� mm39 |�� 699.3571�� 726.3962���� 0.96
0.336��� -724.3532��� 2123.067
������� mm40 |�� 487.3255�� 617.6076���� 0.79
0.430��� -723.1631��� 1697.814
������� mm41 |�� 1575.052�� 1155.193���� 1.36
0.173��� -689.0844��� 3839.188
������� mm42 |� -155.3469�� 530.8564��� -0.29
0.770��� -1195.806��� 885.1125
������� mm43 |�� 51.08252�� 564.6187���� 0.09
0.928���� -1055.55��� 1157.715
������� mm44 |�� 119.5142�� 569.8381���� 0.21
0.834��� -997.3479��� 1236.376
������� mm45 |�� 263.1357�� 575.8147���� 0.46
0.648��� -865.4404��� 1391.712
������� mm46 |�� 235.8872�� 574.7066���� 0.41
0.681��� -890.5171��� 1362.292
������� mm47 |� -329.0518�� 583.1212��� -0.56
0.573��� -1471.948��� 813.8448
������� mm48 |�� -995.237�� 805.7808��� -1.24
0.217��� -2574.538��� 584.0643
������� mm49 |� -459.7242�� 597.8082��� -0.77
0.442��� -1631.407��� 711.9582
������� mm50 |�� 241.0219�� 656.1713���� 0.37
0.713���� -1045.05��� 1527.094
������� mm51 |��� -3.8692�� 640.1957��� -0.01
0.995���� -1258.63��� 1250.891
������� mm52 |�� 101.8969�� 576.5746���� 0.18
0.860��� -1028.168��� 1231.962
������� mm53 |�� 909.3605�� 1188.337���� 0.77
0.444��� -1419.738��� 3238.459
������� mm54 |� -622.1598�� 745.0753��� -0.84
0.404��� -2082.481���� 838.161
������� mm55 |� -202.6312�� 605.8447��� -0.33
0.738��� -1390.065��� 984.8026
������� mm56 |�� 451.7741�� 862.7561���� 0.52
0.601��� -1239.197��� 2142.745
������� mm57 |�� 1500.307�� 1628.656���� 0.92
0.357��� -1691.799��� 4692.414
������� mm58 |�� 1684.418�� 1593.234���� 1.06
0.290��� -1438.264��� 4807.099
������� mm59 |�� 796.8443�� 817.5986���� 0.97
0.330��� -805.6194��� 2399.308
������� mm60 |�� 2312.352�� 2071.913���� 1.12
0.264��� -1748.524��� 6373.228
������ _cons |� -495.3673�� 3248.196��� -0.15
0.879��� -6861.714��� 5870.979
-------------+----------------------------------------------------------------
����� /sigma |�� 3163.778
1925.315�������������������� -609.7704��� 6937.326
------------------------------------------------------------------------------
� Observation summary:����� 1468���� uncensored
observations
���������������������������� 253� left-censored
observations
������������������������������ 0 right-censored
observations
������������������������������ 0������ interval
observations

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