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st: comparing rates
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
. 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).
Ricardo Ovaldia, MS
Oklahoma City, OK
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