xtreg POPGROWTH GDPGROWTH UNEMP, re Random-effects GLS regression Number of obs = 6,650 Group variable: COUNTRYCODE Number of groups = 266 R-squared: Obs per group: Within = 0.0108 min = 25 Between = 0.1091 avg = 25.0 Overall = 0.0239 max = 25 Wald chi2(2) = 75.05 corr(u_i, X) = 0 (assumed) Prob > chi2 = 0.0000 ------------------------------------------------------------------------------ POPGROWTH | Coefficient Std. err. z P>|z| [95% conf. interval] -------------+---------------------------------------------------------------- GDPGROWTH | .0199945 .0023098 8.66 0.000 .0154673 .0245217 UNEMP | .0004916 .0019478 0.25 0.801 -.003326 .0043092 _cons | 1.266688 .0694087 18.25 0.000 1.130649 1.402726 -------------+---------------------------------------------------------------- sigma_u | 1.099536 sigma_e | .91600404 rho | .59030965 (fraction of variance due to u_i)