------------------------------------------------------------------------------------------------- log: C:\MyDocs\MPH\Text\SecondEdition\WebDoFiles\5.9.EsophagealCa.log log type: text opened on: 30 Dec 2007, 20:55:23 . * 5.9.EsophagealCa.log . * . * Calculate age-adjusted odds ratio from the Ille-et-Vilaine study . * of esophageal cancer and alcohol using logistic regression. . * . use C:\WDDtext\5.5.EsophagealCa.dta, clear . * . * First, define indicator variables for age strata 2 through 6 . * . generate age2 = 0 . replace age2 = 1 if age == 2 (32 real changes made) . generate age3 = 0 . replace age3 = 1 if age == 3 (32 real changes made) . generate age4 = 0 . replace age4 = 1 if age == 4 (32 real changes made) . generate age5 = 0 . replace age5 = 1 if age == 5 (32 real changes made) . generate age6 = 0 . replace age6 = 1 if age == 6 (32 real changes made) . logistic cancer age2 age3 age4 age5 age6 heavy [freq=patients] Logistic regression Number of obs = 975 LR chi2(6) = 200.57 Prob > chi2 = 0.0000 Log likelihood = -394.46094 Pseudo R2 = 0.2027 ------------------------------------------------------------------------------ cancer | Odds Ratio Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- age2 | 4.675303 4.983382 1.45 0.148 .5787862 37.76602 age3 | 24.50217 25.06914 3.13 0.002 3.298423 182.0131 age4 | 40.99664 41.75634 3.65 0.000 5.56895 301.8028 age5 | 52.81958 54.03823 3.88 0.000 7.111389 392.3155 age6 | 52.57232 55.99081 3.72 0.000 6.519386 423.9432 heavy | 5.311584 1.007086 8.81 0.000 3.662981 7.702174 ------------------------------------------------------------------------------ . log close log: C:\MyDocs\MPH\Text\SecondEdition\WebDoFiles\5.9.EsophagealCa.log log type: text closed on: 30 Dec 2007, 20:55:23 -----------------------------------------------------------------------------------------------