--------------------------------------------------------------------------------------- log: ps4.log log type: text opened on: 6 Dec 2002, 09:47:26 . use ps4,clear . sort year . by year:sum c _______________________________________________________________________________ -> year = 1980 Variable | Obs Mean Std. Dev. Min Max -------------+----------------------------------------------------- c | 9881 .0853153 .2793644 0 1 _______________________________________________________________________________ -> year = 1990 Variable | Obs Mean Std. Dev. Min Max -------------+----------------------------------------------------- c | 8722 .105939 .3077772 0 1 _______________________________________________________________________________ -> year = 2000 Variable | Obs Mean Std. Dev. Min Max -------------+----------------------------------------------------- c | 7488 .2433226 .4291169 0 1 . sort year sex . by year sex:sum c _______________________________________________________________________________ -> year = 1980, sex = 0 Variable | Obs Mean Std. Dev. Min Max -------------+----------------------------------------------------- c | 4520 .0767699 .2662555 0 1 _______________________________________________________________________________ -> year = 1980, sex = 1 Variable | Obs Mean Std. Dev. Min Max -------------+----------------------------------------------------- c | 5361 .0925201 .2897857 0 1 _______________________________________________________________________________ -> year = 1990, sex = 0 Variable | Obs Mean Std. Dev. Min Max -------------+----------------------------------------------------- c | 3939 .1111957 .3144143 0 1 _______________________________________________________________________________ -> year = 1990, sex = 1 Variable | Obs Mean Std. Dev. Min Max -------------+----------------------------------------------------- c | 4783 .1016099 .3021662 0 1 _______________________________________________________________________________ -> year = 2000, sex = 0 Variable | Obs Mean Std. Dev. Min Max -------------+----------------------------------------------------- c | 3390 .2622419 .4399184 0 1 _______________________________________________________________________________ -> year = 2000, sex = 1 Variable | Obs Mean Std. Dev. Min Max -------------+----------------------------------------------------- c | 4098 .227672 .419381 0 1 . sort year . by year:reg c sex _______________________________________________________________________________ -> year = 1980 Source | SS df MS Number of obs = 9881 -------------+------------------------------ F( 1, 9879) = 7.80 Model | .608348189 1 .608348189 Prob > F = 0.0052 Residual | 770.470895 9879 .077990778 R-squared = 0.0008 -------------+------------------------------ Adj R-squared = 0.0007 Total | 771.079243 9880 .078044458 Root MSE = .27927 ------------------------------------------------------------------------------ c | Coef. Std. Err. t P>|t| [95% Conf. Interval] -------------+---------------------------------------------------------------- sex | .0157501 .0056394 2.79 0.005 .0046958 .0268044 _cons | .0767699 .0041539 18.48 0.000 .0686275 .0849123 ------------------------------------------------------------------------------ _______________________________________________________________________________ -> year = 1990 Source | SS df MS Number of obs = 8722 -------------+------------------------------ F( 1, 8720) = 2.10 Model | .198487448 1 .198487448 Prob > F = 0.1478 Residual | 825.913872 8720 .094714894 R-squared = 0.0002 -------------+------------------------------ Adj R-squared = 0.0001 Total | 826.11236 8721 .094726793 Root MSE = .30776 ------------------------------------------------------------------------------ c | Coef. Std. Err. t P>|t| [95% Conf. Interval] -------------+---------------------------------------------------------------- sex | -.0095859 .0066218 -1.45 0.148 -.0225661 .0033944 _cons | .1111957 .0049036 22.68 0.000 .1015835 .120808 ------------------------------------------------------------------------------ _______________________________________________________________________________ -> year = 2000 Source | SS df MS Number of obs = 7488 -------------+------------------------------ F( 1, 7486) = 12.06 Model | 2.21717961 1 2.21717961 Prob > F = 0.0005 Residual | 1376.44895 7486 .183869751 R-squared = 0.0016 -------------+------------------------------ Adj R-squared = 0.0015 Total | 1378.66613 7487 .184141329 Root MSE = .4288 ------------------------------------------------------------------------------ c | Coef. Std. Err. t P>|t| [95% Conf. Interval] -------------+---------------------------------------------------------------- sex | -.0345699 .0099553 -3.47 0.001 -.0540849 -.0150548 _cons | .2622419 .0073647 35.61 0.000 .247805 .2766788 ------------------------------------------------------------------------------ . by year:reg c sex fschyr mschyr taipei tpc _______________________________________________________________________________ -> year = 1980 Source | SS df MS Number of obs = 9881 -------------+------------------------------ F( 5, 9875) = 260.50 Model | 89.8515668 5 17.9703134 Prob > F = 0.0000 Residual | 681.227676 9875 .068985081 R-squared = 0.1165 -------------+------------------------------ Adj R-squared = 0.1161 Total | 771.079243 9880 .078044458 Root MSE = .26265 ------------------------------------------------------------------------------ c | Coef. Std. Err. t P>|t| [95% Conf. Interval] -------------+---------------------------------------------------------------- sex | .0168148 .0053062 3.17 0.002 .0064136 .027216 fschyr | .0172871 .0008726 19.81 0.000 .0155767 .0189975 mschyr | .0094403 .0009371 10.07 0.000 .0076034 .0112772 taipei | .0623863 .0092476 6.75 0.000 .0442591 .0805136 tpc | .0030753 .0092378 0.33 0.739 -.0150328 .0211833 _cons | -.0745672 .0059852 -12.46 0.000 -.0862995 -.0628349 ------------------------------------------------------------------------------ _______________________________________________________________________________ -> year = 1990 Source | SS df MS Number of obs = 8722 -------------+------------------------------ F( 5, 8716) = 193.85 Model | 82.6746301 5 16.534926 Prob > F = 0.0000 Residual | 743.437729 8716 .085295747 R-squared = 0.1001 -------------+------------------------------ Adj R-squared = 0.0996 Total | 826.11236 8721 .094726793 Root MSE = .29205 ------------------------------------------------------------------------------ c | Coef. Std. Err. t P>|t| [95% Conf. Interval] -------------+---------------------------------------------------------------- sex | -.0013918 .0062913 -0.22 0.825 -.0137241 .0109406 fschyr | .0175341 .0010291 17.04 0.000 .0155169 .0195514 mschyr | .012197 .001117 10.92 0.000 .0100074 .0143866 taipei | .049019 .011091 4.42 0.000 .0272781 .07076 tpc | .0033376 .0099565 0.34 0.737 -.0161796 .0228548 _cons | -.0929255 .0082544 -11.26 0.000 -.1091061 -.0767449 ------------------------------------------------------------------------------ _______________________________________________________________________________ -> year = 2000 Source | SS df MS Number of obs = 7488 -------------+------------------------------ F( 5, 7482) = 177.46 Model | 146.167663 5 29.2335327 Prob > F = 0.0000 Residual | 1232.49847 7482 .164728478 R-squared = 0.1060 -------------+------------------------------ Adj R-squared = 0.1054 Total | 1378.66613 7487 .184141329 Root MSE = .40587 ------------------------------------------------------------------------------ c | Coef. Std. Err. t P>|t| [95% Conf. Interval] -------------+---------------------------------------------------------------- sex | -.030565 .0094241 -3.24 0.001 -.0490388 -.0120912 fschyr | .0249092 .0017825 13.97 0.000 .0214151 .0284033 mschyr | .0169294 .0018778 9.02 0.000 .0132485 .0206104 taipei | .05047 .0168502 3.00 0.003 .0174389 .0835011 tpc | .0055722 .0150669 0.37 0.712 -.0239632 .0351076 _cons | -.0992581 .0143634 -6.91 0.000 -.1274145 -.0711017 ------------------------------------------------------------------------------ . log close log: ps4.log log type: text closed on: 6 Dec 2002, 09:47:29 ---------------------------------------------------------------------------------------