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       log:  C:\MyDocs\MPH\Text\SecondEdition\WebDoFiles\4.22.EsophagealCa.log
  log type:  text
 opened on:  30 Dec 2007, 20:53:42

. *  4.22.EsophagealCa.log
. *
. *  Logistic regression analysis of 2x2 case-control data from
. *  the Ille-et-Vilaine study of esophageal cancer and alcohol.  
. *
. use C:\WDDtext\4.21.EsophagealCa.dta,clear

. cc cancer alcohol [freq=patients], woolf

                 | alcohol                |             Proportion
                 |   Exposed   Unexposed  |      Total     Exposed
-----------------+------------------------+------------------------
           Cases |        96         104  |        200       0.4800
        Controls |       109         666  |        775       0.1406
-----------------+------------------------+------------------------
           Total |       205         770  |        975       0.2103
                 |                        |
                 |      Point estimate    |    [95% Conf. Interval]
                 |------------------------+------------------------
      Odds ratio |         5.640085       |    4.000589    7.951467 (Woolf)
 Attr. frac. ex. |         .8226977       |    .7500368    .8742371 (Woolf)
 Attr. frac. pop |         .3948949       |
                 +-------------------------------------------------
                               chi2(1) =   110.26  Pr>chi2 = 0.0000

. logistic alcohol cancer [freq=patients]

Logistic regression                               Number of obs   =        975
                                                  LR chi2(1)      =      96.43
                                                  Prob > chi2     =     0.0000
Log likelihood =  -453.2224                       Pseudo R2       =     0.0962

------------------------------------------------------------------------------
     alcohol | Odds Ratio   Std. Err.      z    P>|z|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
      cancer |   5.640085   .9883491     9.87   0.000     4.000589    7.951467
------------------------------------------------------------------------------

. log close
       log:  C:\MyDocs\MPH\Text\SecondEdition\WebDoFiles\4.22.EsophagealCa.log
  log type:  text
 closed on:  30 Dec 2007, 20:53:42
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