xttobit effch3 l. effch3 ip1 lnel ,ll(1)
Obtaining starting values for full model:
Iteration 0: log likelihood = -347.34016
Iteration 1: log likelihood = -347.32553
Iteration 2: log likelihood = -347.32553
Fitting full model:
Iteration 0: log likelihood = -342.05444 (not concave)
Iteration 1: log likelihood = -316.63073 (not concave)
Iteration 2: log likelihood = -312.17029 (not concave)
Iteration 3: log likelihood = -311.11368 (not concave)
Iteration 4: log likelihood = -310.82671 (not concave)
Iteration 5: log likelihood = -310.68559 (not concave)
Iteration 6: log likelihood = -310.65818 (not concave)
Iteration 7: log likelihood = -310.64911 (not concave)
Iteration 8: log likelihood = -310.64602 (not concave)
Iteration 9: log likelihood = -310.64571 (not concave)
Iteration 10: log likelihood = -310.6407 (not concave)
Iteration 11: log likelihood = -310.63627 (not concave)
Iteration 12: log likelihood = -310.63264 (not concave)
Iteration 13: log likelihood = -310.59238
Iteration 14: log likelihood = -310.20212
Iteration 15: log likelihood = -310.20044
Iteration 16: log likelihood = -310.20044
Random-effects tobit regression Number of obs = 276
Group variable: year Number of groups = 12
Random effects u_i ~ Gaussian Obs per group: min = 23
avg = 23.0
max = 23
Wald chi2(3) = 8.01
Log likelihood = -310.20044 Prob > chi2 = 0.0458
------------------------------------------------------------------------------
effch3 | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
effch3 |
L1. | .2560992 .0994897 2.57 0.010 .061103 .4510954
|
ip1 | 3.292517 2.700051 1.22 0.223 -1.999485 8.584519
lnel | .2209281 .2396958 0.92 0.357 -.248867 .6907231
_cons | -1.013065 1.484513 -0.68 0.495 -3.922658 1.896527
-------------+----------------------------------------------------------------
/sigma_u | .1144244 .2090943 0.55 0.584 -.2953928 .5242416
/sigma_e | 1.253896 .0814858 15.39 0.000 1.094187 1.413606
-------------+----------------------------------------------------------------
rho | .0082587 .0300174 2.76e-07 .584232
------------------------------------------------------------------------------
Observation summary: 139 left-censored observations
137 uncensored observations
0 right-censored observations
结果如上,请高人指点


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