Skip Navigation

This Article
Right arrow FREE Full Text (PDF) Freely available
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Right arrow Disclaimer
Google Scholar
Right arrow Articles by Strömberg, U.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Strömberg, U.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

American Journal of Epidemiology Vol. 144, No. 4: 421-424
Copyright © 1996 by The Johns Hopkins University School of Hygiene and Public Health

other

Collapsing Ordered Outcome Categories: A Note of Concern

Ulf Strömberg

From the Department of Occupational and Environmental Medicine, University Hospital, Lund University S-221 85 Lund, Sweden

Reprinrt requests to Dr. Ulf Strömberg at this address

When analyzing and interpreting data from an epidemiologic study where ordinal (ordered categorical) outcomes have been measured in different exposure groups, an effect parameter of interest is the common odds ratio implied by the proportional odds model. This model can sometimes be applied to a collapsed outcome variable, instead of the measured variable, without reducing efficiency considerably. However, in a given data set, changing the outcome categories can affect the effect estimate as well as the inference being drawn from the data, even if the true effect itself has not changed. In particular, one should be careful in dichotomizing the measured outcome variable. Am J Epidemiol 1996; 144: 421–4.

data interpretation, statistical; epidemiologic methods; statistics


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 Neuro OncolHome page
F. G. Barker II, W. T. Curry Jr., and B. S. Carter
Surgery for primary supratentorial brain tumors in the United States, 1988 to 2000: The effect of provider caseload and centralization of care
Neuro-oncol, January 1, 2005; 7(1): 49 - 63.
[Abstract] [PDF]

Home page
 J. Clin. Endocrinol. Metab.Home page
F. G. Barker II, A. Klibanski, and B. Swearingen
Transsphenoidal Surgery for Pituitary Tumors in the United States, 1996-2000: Mortality, Morbidity, and the Effects of Hospital and Surgeon Volume
J. Clin. Endocrinol. Metab., October 1, 2003; 88(10): 4709 - 4719.
[Abstract] [Full Text] [PDF]

Home page
 Am. J. Neuroradiol.Home page
B. L. Hoh, J. D. Rabinov, J. C. Pryor, B. S. Carter, and F. G. Barker II
In-Hospital Morbidity and Mortality after Endovascular Treatment of Unruptured Intracranial Aneurysms in the United States, 1996-2000: Effect of Hospital and Physician Volume
AJNR Am. J. Neuroradiol., August 1, 2003; 24(7): 1409 - 1420.
[Abstract] [Full Text] [PDF]


Disclaimer:
Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.