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st: comparing rates

From   Ricardo Ovaldia <>
Subject   st: comparing rates
Date   Fri, 5 Sep 2003 11:17:20 -0700 (PDT)

I am sorry about the double posting but I am not sure
how to do this. Any help will be greatly appreciated.

 We are interested in comparing the referral rates
 for two physician practices.   The fist group has 20
 physicians and the second group has 22 physicians.
 Each physician saw a variable number of similar
 patients some saw as few as 4 and others as many as
 43. The physician either referred the patient to a
 specialist or did not. 
 If I compute the referral rate for each physician
 group and compare them, I concerned because the
 observations are not independent. I suspect that
 some doctors are more likely to refer patients than

 I though that I could use –clogit- to group by
 doctor’s ID:
 . clogit referred practice, group(doctorid)
 This did not work because the –practice- variable
 not vary within doctor ID, so it is dropped from the
 model (omitted due to no within-group variance).
 Thank you,

Ricardo Ovaldia, MS
Oklahoma City, OK

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