Re: Logistic regression and center effect

On Nov 6, 1:14 am, M. A. Specka <ernst.kuzo...@das-spiel-hat-90-
minuten.de> wrote:
On Mon, 05 Nov 2007 11:24:41 -0800, Ray Koopman <koop...@xxxxxx>
wrote:

Dummy-code the centers: Choose one center arbitrarily as a baseline
center or reference center. Then generate eight dichotomous indicator
variables, one for each of the other centers. Patients from the
reference center will get eight 0's; patients from other centers will
get seven 0's and a single 1. Use the indicators as predictors in the
regression. (Note: the fact that you're doing logistic regression
plays no role in all this.)

That sounds great, thank you very much for your reply.

By the way, when doing a search on this topic, I now found
a recommendation for "conditioned logistc regression" (which
wasn't explained in detail). Is the suggested procedure identical
to that, or does it at least produce identical results?

Regards

Michael

I think they mean "conditional logistic regression".
It gives different results. For one discussion, see
www.cceb.upenn.edu/pages/localio/EPI521/2006/v2part4.pdf

.

Relevant Pages

  • Re: Logistic regression and center effect
    ... center or reference center. ... Then generate eight dichotomous indicator ... reference center will get eight 0's; patients from other centers will ... the fact that you're doing logistic regression ...
    (sci.stat.consult)
  • Re: Logistic regression and center effect
    ... center or reference center. ... Then generate eight dichotomous indicator ... reference center will get eight 0's; patients from other centers will ... correponding group with the reference group. ...
    (sci.stat.consult)
  • Re: Logistic regression and center effect
    ... patients per center, the total N is about 1000. ... Normally, multiple logistic regression ... center or reference center. ... Then generate eight dichotomous indicator ...
    (sci.stat.consult)
  • Logistic regression and rare events
    ... G King and L Zeng, "Logistic regression in rare events data," ... In this paper it is stated (without reference) that: ... Other references dealing with the influence on rare events in logistic ...
    (sci.stat.consult)
  • Re: Logistic regression and center effect
    ... You can read about conditional logistic regression in SAS Online DOC ... The solution with dummy coding centers is perfect, ... center or reference center. ... correponding group with the reference group. ...
    (sci.stat.consult)