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      name:  <unnamed>
       log:  C:\MyDocs\MPH\LectureNotes\ClassDoLogData\Poisson\8.2.Framingham.log
  log type:  text
 opened on:  29 Apr 2010, 17:19:57

. *  8.2.Framingham.log                
. *
. *  Estimate the crude (unadjusted) relative risk of 
. *  coronary heart disease in men compared to women using 
. *  person-year data from the Framingham Heart Study (Levy 1999).
. *
. iri 823 650 42259 61451

                 |   Exposed   Unexposed  |      Total
-----------------+------------------------+------------
           Cases |       823         650  |       1473
     Person-time |     42259       61451  |     103710
-----------------+------------------------+------------
                 |                        |
  Incidence rate |  .0194751    .0105775  |   .0142031
                 |                        |
                 |      Point estimate    |    [95% Conf. Interval]
                 |------------------------+------------------------
 Inc. rate diff. |         .0088976       |    .0073383     .010457 
 Inc. rate ratio |          1.84118       |    1.659204    2.043774 (exact)
 Attr. frac. ex. |           .45687       |    .3973015     .510709 (exact)
 Attr. frac. pop |         .2552641       |
                 +-------------------------------------------------
                     (midp)   Pr(k>=823) =                   0.0000 (exact)
                     (midp) 2*Pr(k>=823) =                   0.0000 (exact)

. *
. *  The equivalent ir command is illustrated below.  
. *  
. use 8.2.Framingham.dta, clear

. list

     +-----------------------+
     |  male   chd   per_yrs |
     |-----------------------|
  1. | Women   650     61451 |
  2. |   Men   823     42259 |
     +-----------------------+

. ir chd male per_yrs

                 | Male                   |
                 |   Exposed   Unexposed  |      Total
-----------------+------------------------+------------
    CHD patients |       823         650  |       1473
 P-yrs follow-up |     42259       61451  |     103710
-----------------+------------------------+------------
                 |                        |
  Incidence rate |  .0194751    .0105775  |   .0142031
                 |                        |
                 |      Point estimate    |    [95% Conf. Interval]
                 |------------------------+------------------------
 Inc. rate diff. |         .0088976       |    .0073383     .010457 
 Inc. rate ratio |          1.84118       |    1.659204    2.043774 (exact)
 Attr. frac. ex. |           .45687       |    .3973015     .510709 (exact)
 Attr. frac. pop |         .2552641       |
                 +-------------------------------------------------
                     (midp)   Pr(k>=823) =                   0.0000 (exact)
                     (midp) 2*Pr(k>=823) =                   0.0000 (exact)

. log close
      name:  <unnamed>
       log:  C:\MyDocs\MPH\LectureNotes\ClassDoLogData\Poisson\8.2.Framingham.log
  log type:  text
 closed on:  29 Apr 2010, 17:19:57
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