---------------------------------------------------------------------------------- name: log: C:\Users\LabProf01\Desktop\Wage2_Educ_Sibs.log log type: text opened on: 31 May 2023, 16:11:40 . reg lwage sibs Source | SS df MS Number of obs = 935 -------------+---------------------------------- F(1, 933) = 22.31 Model | 3.86818074 1 3.86818074 Prob > F = 0.0000 Residual | 161.788103 933 .173406326 R-squared = 0.0234 -------------+---------------------------------- Adj R-squared = 0.0223 Total | 165.656283 934 .177362188 Root MSE = .41642 ------------------------------------------------------------------------------ lwage | Coef. Std. Err. t P>|t| [95% Conf. Interval] -------------+---------------------------------------------------------------- sibs | -.0279044 .0059082 -4.72 0.000 -.0394992 -.0163096 _cons | 6.861076 .0220776 310.77 0.000 6.817748 6.904403 ------------------------------------------------------------------------------ . ivregress 2sls lwage (educ=sibs) Instrumental variables (2SLS) regression Number of obs = 935 Wald chi2(1) = 21.63 Prob > chi2 = 0.0000 R-squared = . Root MSE = .42284 ------------------------------------------------------------------------------ lwage | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- educ | .1224326 .0263224 4.65 0.000 .0708417 .1740235 _cons | 5.130026 .3547911 14.46 0.000 4.434648 5.825404 ------------------------------------------------------------------------------ Instrumented: educ Instruments: sibs . reg educ brthord Source | SS df MS Number of obs = 852 -------------+---------------------------------- F(1, 850) = 37.29 Model | 173.087012 1 173.087012 Prob > F = 0.0000 Residual | 3945.88364 850 4.64221605 R-squared = 0.0420 -------------+---------------------------------- Adj R-squared = 0.0409 Total | 4118.97066 851 4.84015353 Root MSE = 2.1546 ------------------------------------------------------------------------------ educ | Coef. Std. Err. t P>|t| [95% Conf. Interval] -------------+---------------------------------------------------------------- brthord | -.2826441 .0462882 -6.11 0.000 -.3734967 -.1917915 _cons | 14.14945 .1286754 109.96 0.000 13.89689 14.40201 ------------------------------------------------------------------------------ . ivregress 2sls lwage (educ= brthord ) Instrumental variables (2SLS) regression Number of obs = 852 Wald chi2(1) = 16.67 Prob > chi2 = 0.0000 R-squared = . Root MSE = .42101 ------------------------------------------------------------------------------ lwage | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- educ | .1306448 .0320009 4.08 0.000 .0679242 .1933654 _cons | 5.030397 .4324406 11.63 0.000 4.182829 5.877965 ------------------------------------------------------------------------------ Instrumented: educ Instruments: brthord . ivregress 2sls lwage sibs (educ= brthord ), first First-stage regressions ----------------------- Number of obs = 852 F( 2, 849) = 26.29 Prob > F = 0.0000 R-squared = 0.0583 Adj R-squared = 0.0561 Root MSE = 2.1374 ------------------------------------------------------------------------------ educ | Coef. Std. Err. t P>|t| [95% Conf. Interval] -------------+---------------------------------------------------------------- sibs | -.1528673 .0398705 -3.83 0.000 -.2311236 -.0746109 brthord | -.1526742 .0570764 -2.67 0.008 -.2647017 -.0406467 _cons | 14.2965 .1332881 107.26 0.000 14.03489 14.55811 ------------------------------------------------------------------------------ Instrumental variables (2SLS) regression Number of obs = 852 Wald chi2(2) = 21.87 Prob > chi2 = 0.0000 R-squared = . Root MSE = .42623 ------------------------------------------------------------------------------ lwage | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- educ | .1369941 .0745496 1.84 0.066 -.0091204 .2831087 sibs | .0021108 .0173411 0.12 0.903 -.0318772 .0360987 _cons | 4.938527 1.05383 4.69 0.000 2.873058 7.003996 ------------------------------------------------------------------------------ Instrumented: educ Instruments: sibs brthord . reg educ sibs brthord Source | SS df MS Number of obs = 852 -------------+---------------------------------- F(2, 849) = 26.29 Model | 240.246365 2 120.123183 Prob > F = 0.0000 Residual | 3878.72429 849 4.56857985 R-squared = 0.0583 -------------+---------------------------------- Adj R-squared = 0.0561 Total | 4118.97066 851 4.84015353 Root MSE = 2.1374 ------------------------------------------------------------------------------ educ | Coef. Std. Err. t P>|t| [95% Conf. Interval] -------------+---------------------------------------------------------------- sibs | -.1528673 .0398705 -3.83 0.000 -.2311236 -.0746109 brthord | -.1526742 .0570764 -2.67 0.008 -.2647017 -.0406467 _cons | 14.2965 .1332881 107.26 0.000 14.03489 14.55811 ------------------------------------------------------------------------------ . predict educ_hat (option xb assumed; fitted values) (83 missing values generated) . correl educ_hat sibs (obs=852) | educ_hat sibs -------------+------------------ educ_hat | 1.0000 sibs | -0.9295 1.0000 . log close name: log: C:\Users\LabProf01\Desktop\Wage2_Educ_Sibs.log log type: text closed on: 31 May 2023, 16:32:45 ----------------------------------------------------------------------------------