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st: Help please re Ocratio


From   "Jon Heron (ALSPAC)" <Jon.Heron@bristol.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: Help please re Ocratio
Date   Tue, 30 Oct 2007 09:26:15 +0000

 Hi,

 I would like to fit a continuation ratio model to a 6-level outcome
 using ocratio. I would then like to assess the constancy of model
 parameters by fitting a series of logistic models


 A quick lit search is showing variability in which comparisons are being
 made with a CR model.

  e.g. for 3-level outcome - 1/2/3

  Armstrong and Sloan (1989)
    1 versus 2 & 3
    2 versus 3

  Manor, Matthews and Power (2000)
    1 versus 2
    1 & 2 versus 3

  Greenland (1994)
    2 & 3 versus 1,2 & 3
    3 versus 2 & 3

 I imagine these are all permitted alternatives, but i would like to know
 which particular comparisons are made using ocratio so I can fit the
 appropriate logistic models.

 Any help gratefully received


 cheers


 Jon
--------------------------------------------------
Dr Jon Heron
Statistics Team Leader
ALSPAC, Dept of Social Medicine
24 Tyndall Avenue
Bristol BS8 1TQ
Tel: 0117 3311616
Fax: 0117 3311704

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