However, I think it should be pointed out that this is the exception rather than the rule. It should not be seen as a justification for categorizing contiuous data in general, nut only in certain circumstances.
Dr. Paul R. Swank,
Professor
Children's Learning Institute
University of Texas Health Science Center-Houston
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of Martin Holt
Sent: Wednesday, June 15, 2011 11:07 AM
To: [hidden email]
Subject: PDF File of CMAJ paper "categorisation not a bad thing"
Hi, A couple of days ago I posted a comment that a case could be made for first performing categorisation before doing just the continuous analysis (as is always said to be required), as the data might have an unusual shape (eg BMI is parabolic). I've been asked to supply a copy of the CMAJ paper that makes this case. So I've scanned it in as a PDF document, and if anyone else wants a copy please contact me offlist on [hidden email] and I'll duly send one. Best Wishes, Martin Holt |
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