------------------------------------------------------------------------------------------------- log: C:\MyDocs\MPH\Text\SecondEdition\WebDoFiles\11.11.Isoproterenol.log log type: text opened on: 3 Jan 2008, 17:52:28 . * 11.11.Isoproterenol.log . * . * Perform a GEE analysis of the effect of race and dose of isoproterenol . * on blood flow using the data of Lang et al. (1995). . * . use C:\WDDtext\11.2.Long.Isoproterenol.dta ,clear . drop if dose==0 | id==8 (28 observations deleted) . generate white = race==1 . * . * Analyze data using classification variables with interaction . * . xi: xtgee delta_fbf i.dose*white, i(id) robust i.dose _Idose_10-400 (naturally coded; _Idose_10 omitted) i.dose*white _IdosXwhi_# (coded as above) Iteration 1: tolerance = 2.066e-13 GEE population-averaged model Number of obs = 126 Group variable: id Number of groups = 21 Link: identity Obs per group: min = 6 Family: Gaussian avg = 6.0 Correlation: exchangeable max = 6 Wald chi2(11) = 506.86 Scale parameter: 23.50629 Prob > chi2 = 0.0000 (Std. Err. adjusted for clustering on id) ------------------------------------------------------------------------------ | Semi-robust delta_fbf | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- _Idose_20 | .6333333 .2706638 2.34 0.019 .1028421 1.163825 _Idose_60 | 2.724445 .6585882 4.14 0.000 1.433635 4.015254 _Idose_150 | 3.656667 .7054437 5.18 0.000 2.274022 5.039311 _Idose_300 | 6.478889 1.360126 4.76 0.000 3.813091 9.144687 _Idose_400 | 5.19 1.830717 2.83 0.005 1.601861 8.77814 white | .3375 .363115 0.93 0.353 -.3741922 1.049192 _IdosXwhi_20 | 2.408333 .5090358 4.73 0.000 1.410642 3.406025 _IdosXwhi_60 | 8.450556 1.823352 4.63 0.000 4.876852 12.02426 _IdosXwh~150 | 10.17667 2.20775 4.61 0.000 5.849557 14.50378 _IdosXwh~300 | 10.30444 2.305474 4.47 0.000 5.785798 14.82309 _IdosXwh~400 | 15.22667 2.748106 5.54 0.000 9.840479 20.61285 _cons | .3966667 .2001388 1.98 0.047 .0044017 .7889316 ------------------------------------------------------------------------------ . lincom _cons + white ( 1) white + _cons = 0 ------------------------------------------------------------------------------ delta_fbf | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- (1) | .7341667 .30298 2.42 0.015 .1403367 1.327997 ------------------------------------------------------------------------------ . lincom _cons+ _Idose_20 ( 1) _Idose_20 + _cons = 0 ------------------------------------------------------------------------------ delta_fbf | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- (1) | 1.03 .3024088 3.41 0.001 .4372896 1.62271 ------------------------------------------------------------------------------ . lincom _cons+ _Idose_20 + white +_IdosXwhi_20 ( 1) _Idose_20 + white + _IdosXwhi_20 + _cons = 0 ------------------------------------------------------------------------------ delta_fbf | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- (1) | 3.775833 .5898076 6.40 0.000 2.619832 4.931835 ------------------------------------------------------------------------------ . lincom white +_IdosXwhi_20 ( 1) white + _IdosXwhi_20 = 0 ------------------------------------------------------------------------------ delta_fbf | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- (1) | 2.745833 .6628153 4.14 0.000 1.446739 4.044927 ------------------------------------------------------------------------------ . lincom _cons+ _Idose_60 ( 1) _Idose_60 + _cons = 0 ------------------------------------------------------------------------------ delta_fbf | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- (1) | 3.121111 .5861829 5.32 0.000 1.972214 4.270009 ------------------------------------------------------------------------------ . lincom _cons+ _Idose_60 + white +_IdosXwhi_60 ( 1) _Idose_60 + white + _IdosXwhi_60 + _cons = 0 ------------------------------------------------------------------------------ delta_fbf | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- (1) | 11.90917 1.883903 6.32 0.000 8.216785 15.60155 ------------------------------------------------------------------------------ . lincom white +_IdosXwhi_60 ( 1) white + _IdosXwhi_60 = 0 ------------------------------------------------------------------------------ delta_fbf | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- (1) | 8.788056 1.972993 4.45 0.000 4.921061 12.65505 ------------------------------------------------------------------------------ . lincom _cons+ _Idose_150 ( 1) _Idose_150 + _cons = 0 ------------------------------------------------------------------------------ delta_fbf | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- (1) | 4.053333 .6289189 6.44 0.000 2.820675 5.285992 ------------------------------------------------------------------------------ . lincom _cons+ _Idose_150 + white +_IdosXwhi_150 ( 1) _Idose_150 + white + _IdosXwhi_150 + _cons = 0 ------------------------------------------------------------------------------ delta_fbf | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- (1) | 14.5675 2.271546 6.41 0.000 10.11535 19.01965 ------------------------------------------------------------------------------ . lincom white +_IdosXwhi_150 ( 1) white + _IdosXwhi_150 = 0 ------------------------------------------------------------------------------ delta_fbf | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- (1) | 10.51417 2.357003 4.46 0.000 5.894526 15.13381 ------------------------------------------------------------------------------ . lincom _cons+ _Idose_300 ( 1) _Idose_300 + _cons = 0 ------------------------------------------------------------------------------ delta_fbf | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- (1) | 6.875556 1.257341 5.47 0.000 4.411213 9.339899 ------------------------------------------------------------------------------ . lincom _cons+ _Idose_300 + white +_IdosXwhi_300 ( 1) _Idose_300 + white + _IdosXwhi_300 + _cons = 0 ------------------------------------------------------------------------------ delta_fbf | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- (1) | 17.5175 2.090561 8.38 0.000 13.42007 21.61493 ------------------------------------------------------------------------------ . lincom white +_IdosXwhi_300 ( 1) white + _IdosXwhi_300 = 0 ------------------------------------------------------------------------------ delta_fbf | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- (1) | 10.64194 2.43954 4.36 0.000 5.860535 15.42335 ------------------------------------------------------------------------------ . lincom _cons+ _Idose_400 ( 1) _Idose_400 + _cons = 0 ------------------------------------------------------------------------------ delta_fbf | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- (1) | 5.586667 1.742395 3.21 0.001 2.171636 9.001698 ------------------------------------------------------------------------------ . lincom _cons+ _Idose_400 + white +_IdosXwhi_400 ( 1) _Idose_400 + white + _IdosXwhi_400 + _cons = 0 ------------------------------------------------------------------------------ delta_fbf | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- (1) | 21.15083 2.233954 9.47 0.000 16.77236 25.5293 ------------------------------------------------------------------------------ . lincom white +_IdosXwhi_400 ( 1) white + _IdosXwhi_400 = 0 ------------------------------------------------------------------------------ delta_fbf | Coef. Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- (1) | 15.56417 2.833106 5.49 0.000 10.01138 21.11695 ------------------------------------------------------------------------------ . test _IdosXwhi_20 _IdosXwhi_60 _IdosXwhi_150 _IdosXwhi_300 _IdosXwhi_400 ( 1) _IdosXwhi_20 = 0 ( 2) _IdosXwhi_60 = 0 ( 3) _IdosXwhi_150 = 0 ( 4) _IdosXwhi_300 = 0 ( 5) _IdosXwhi_400 = 0 chi2( 5) = 40.41 Prob > chi2 = 0.0000 . log close log: C:\MyDocs\MPH\Text\SecondEdition\WebDoFiles\11.11.Isoproterenol.log log type: text closed on: 3 Jan 2008, 17:52:31 -----------------------------------------------------------------------------------------------