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From |
Ricardo Ovaldia <ovaldia@yahoo.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: comparing rates |

Date |
Mon, 8 Sep 2003 09:17:36 -0700 (PDT) |

Dear all, I have received only one reply to my post (please see my original post below), so either of two things is possible: (1) there is not a good answer or (2) my question was no clear. So let me ask a slightly different question. Can I simply take the number of referrals at one practice and divide by the number of patients seen at that practice (referral rate for practice 1) and compare it to the rate of the other practice without taking in account that some physicians within practice may refer more than others? Or, should I compute the referral rate for each physician, and then combine these rates within practice by weighting them some how? If so how can I do this in Stata? what kind of weights should I use? Thank you, Ricardo. --- Ricardo Ovaldia <ovaldia@yahoo.com> wrote: > Dear all, > > 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 > other. > I though that I could use 膨logit- to group by > doctor痴 ID: > > . clogit referred practice, group(doctorid) > > This did not work because the 朴ractice- variable > does > not vary within doctor ID, so it is dropped from the > model (omitted due to no within-group variance). > > Any suggestions will be greatly appreciated. > > Thank you, > Ricardo. > > > ===== > Ricardo Ovaldia, MS > Statistician > Oklahoma City, OK > > __________________________________ > Do you Yahoo!? > Yahoo! SiteBuilder - Free, easy-to-use web site > design software > http://sitebuilder.yahoo.com > * > * For searches and help try: > * > http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**RE: st: comparing rates***From:*"German Rodriguez" <grodri@princeton.edu>

**Re: st: comparing rates***From:*Chris Rohlfs <car@uchicago.edu>

**References**:**st: Conditional logistic needed?***From:*Ricardo Ovaldia <ovaldia@yahoo.com>

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