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st: Calculating Prevalence


From   Raphael Fraser <raphael.fraser@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Calculating Prevalence
Date   Wed, 31 Aug 2005 14:11:48 -0500

Dear All,

I have 50 data sets (d1, d2, ..., d50) like the one given below but
much larger. I would like to calculate the prevalence of protein for
each data set by genotype (AA and SS). Then put the results together
in a single file. Can this be done?


DATA SET 1(d1)
id		age	genotype   protein
31		11	AA	       1
40		11	SS	       0
71		11	AA	       1
74		11	AA	       0
88		11	AA	       0
98		11	AA	       0
110	       11      SS	      1

The first two observation in the RESULTS file should look some thing like this:

 age   genotype  prevalence
  11         AA          0.4
  11         SS          0.5 


Thanks in advance

Raphael

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