xtreg dlnpht dcpi dlnnt dq dlnwt di,re
Random-effects GLS regression Number of obs = 446
Group variable: city Number of groups = 35
R-sq: within = 0.0364 Obs per group: min = 11
between = 0.0050 avg = 12.7
overall = 0.0353 max = 14
Random effects u_i ~ Gaussian Wald chi2(5) = 16.12
corr(u_i, X) = 0 (assumed) Prob > chi2 = 0.0065
------------------------------------------------------------------------------
dlnpht | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
dcpi | -.0029467 .002908 -1.01 0.311 -.0086463 .0027529
dlnnt | -.0832945 .0408899 -2.04 0.042 -.1634372 -.0031518
dq | -.1147465 .0459397 -2.50 0.012 -.2047868 -.0247063
dlnwt | .1501595 .0897994 1.67 0.094 -.0258441 .3261631
di | -.0080866 .0071181 -1.14 0.256 -.0220378 .0058646
_cons | .0876685 .0123144 7.12 0.000 .0635328 .1118042
-------------+----------------------------------------------------------------
sigma_u | 0
sigma_e | .14158412
rho | 0 (fraction of variance due to u_i)
------------------------------------------------------------------------------
. xtreg dcpi dlnpht dq dlnwt di,re
Random-effects GLS regression Number of obs = 453
Group variable: city Number of groups = 35
R-sq: within = 0.3062 Obs per group: min = 12
between = 0.0196 avg = 12.9
overall = 0.2880 max = 14
Random effects u_i ~ Gaussian Wald chi2(4) = 181.64
corr(u_i, X) = 0 (assumed) Prob > chi2 = 0.0000
------------------------------------------------------------------------------
dcpi | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
dlnpht | -.6734693 .7714192 -0.87 0.383 -2.185423 .8384846
dq | 2.135848 .7452813 2.87 0.004 .6751238 3.596573
dlnwt | 8.008322 1.405841 5.70 0.000 5.252924 10.76372
di | .9886556 .1065391 9.28 0.000 .7798428 1.197468
_cons | 1.392337 .1868549 7.45 0.000 1.026108 1.758566
-------------+----------------------------------------------------------------
sigma_u | .1111435
sigma_e | 2.2494086
rho | .00243541 (fraction of variance due to u_i)
--------------------------------------------------------------------------


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