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. xtset country year
panel variable: country (strongly balanced)
time variable: year, 1980 to 2011
delta: 1 unit
. xtreg debt dgdp old unem gr ca rate,fe
Fixed-effects (within) regression Number of obs = 639
Group variable: country Number of groups = 20
R-sq: within = 0.6245 Obs per group: min = 31
between = 0.0794 avg = 31.9
overall = 0.2678 max = 32
F(6,613) = 169.90
corr(u_i, Xb) = -0.3414 Prob > F = 0.0000
------------------------------------------------------------------------------
debt | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
dgdp | -1.760713 .2918609 -6.03 0.000 -2.333882 -1.187545
old | 7.830202 .4572636 17.12 0.000 6.932209 8.728195
unem | .5252867 .0570005 9.22 0.000 .4133467 .6372267
gr | .5163171 .0717504 7.20 0.000 .3754108 .6572234
ca | .3618061 .2020915 1.79 0.074 -.0350695 .7586818
rate | .1569799 .2157481 0.73 0.467 -.2667152 .580675
_cons | -89.39736 6.12707 -14.59 0.000 -101.43 -77.36476
-------------+----------------------------------------------------------------
sigma_u | 31.514726
sigma_e | 16.453748
rho | .78580188 (fraction of variance due to u_i)
------------------------------------------------------------------------------
F test that all u_i=0: F(19, 613) = 95.85 Prob > F = 0.0000
. est store fe
. xtreg debt dgdp old unem gr ca rate,re
Random-effects GLS regression Number of obs = 639
Group variable: country Number of groups = 20
R-sq: within = 0.6244 Obs per group: min = 31
between = 0.0807 avg = 31.9
overall = 0.2696 max = 32
Wald chi2(6) = 1009.37
corr(u_i, X) = 0 (assumed) Prob > chi2 = 0.0000
------------------------------------------------------------------------------
debt | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
dgdp | -1.780678 .2925364 -6.09 0.000 -2.354039 -1.207317
old | 7.69061 .4548552 16.91 0.000 6.79911 8.58211
unem | .5306186 .0567473 9.35 0.000 .4193959 .6418412
gr | .5182637 .0714812 7.25 0.000 .3781631 .6583643
ca | .3257689 .2012243 1.62 0.105 -.0686234 .7201611
rate | .1310069 .2157743 0.61 0.544 -.2919029 .5539167
_cons | -87.51629 8.806333 -9.94 0.000 -104.7764 -70.2562
-------------+----------------------------------------------------------------
sigma_u | 28.302826
sigma_e | 16.453748
rho | .74740443 (fraction of variance due to u_i)
------------------------------------------------------------------------------
. est store re
. hausman fe re
---- Coefficients ----
| (b) (B) (b-B) sqrt(diag(V_b-V_B))
| fe re Difference S.E.
-------------+----------------------------------------------------------------
dgdp | -1.760713 -1.780678 .0199648 .
old | 7.830202 7.69061 .1395923 .0468696
unem | .5252867 .5306186 -.0053319 .0053672
gr | .5163171 .5182637 -.0019466 .0062087
ca | .3618061 .3257689 .0360373 .0187021
rate | .1569799 .1310069 .025973 .
------------------------------------------------------------------------------
b = consistent under Ho and Ha; obtained from xtreg
B = inconsistent under Ha, efficient under Ho; obtained from xtreg
Test: Ho: difference in coefficients not systematic
chi2(6) = (b-B)'[(V_b-V_B)^(-1)](b-B)
= 12.24
Prob>chi2 = 0.0569
(V_b-V_B is not positive definite)
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