**************************************************************************
*                                                                        *
* athens.do                                                              *
*                                                                        *
* PURPOSE:  analysis of Tzonou et al. (1998) data investigating          *
*           CHD and iron consumption                                     *
*                                                                        *
* DATE:  April 6 2004                                                   *
*                                                                        *
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***
*** read the data and format
***
  
infile female age iron case count using http://courses.washington.edu/b513/datasets/athens.dat

label define fnames 0 "male" 1 "female"
label values female fnames

label define anames 1 "<= 49" 2 "50-59" 3 "60-69" 4 ">= 70"
label values age anames

label define inames 1 "<= 250mg/month" 2 "251-300 mg/month" 3 "301-350 mg/month" 4 "351-400 mg/month" 5 "> 400 mg/month"
label values iron inames

label define ynames 0 "control" 1 "case"
label values case ynames


***
*** create a single record per subject
***
  
drop if count==0
expand count 
drop count

***
*** create new iron variable
*** 

generate newiron = 0
replace newiron = 1 if iron >= 4