Home Subscription Services
 
   

 
World Journal of Orthodontics
WJO Home Page
About the Editor
Editorial Board
Reprints / Articles
Permissions
Advertising
MEDLINE Search
 
 
 
 
 
FacebookTwitter
Quintessence Publishing: Journals: ORTHODONTICS
ORTHODONTICS
The Art and Practice of Dentofacial Enhancement

Formerly World Journal of Orthodontics

Edited by
Rafi Romano, DMD, MSc (Editor-in-Chief)

ISSN 2160-2999 (print) / ISSN 2160-3006 (online)

Visit the ORTHODONTICS: The Art and Practice of Dentofacial Enhancement Facebook page

Publication:
Yearbook 2012
Volume 13 , Issue 1

Back
Share Abstract:

Alternative methods for evaluating the equivalence of measurement systems

David W. Chambers, EdM, MBA, PhD


Aim: Reports are common in the orthodontic and dental radiographic literature comparing measurement systems. Typically, such comparisons are made using differences in mean scores across methods, correlation coefficients, or Bland-Altman plots. These methods are subject to known limitations, including an inability to detect bias. Methods: A hypothetical dataset was created to contain a small, common random variance and two types of bias to compare three alternative measurement systems against a common standard. One comparison included only random error and no bias. Two types of bias were investigated: systemic overestimation on the part of one measurement system and the more complex case of overestimation in one part of the range and underestimation in the other. Results: Each of the commonly used methods for comparing alternative measurement systems was inadequate for detecting one or the other type of bias. The traditional regression analysis, by contrast, provided a useful characterization of the alternative measurement systems, including quantification of the nature of bias. Conclusion: Regression analysis can reveal biases masked in the common comparison of means, correlation coefficients, and Bland-Altman plots for evaluating alternative measurement systems and thereby improve confidence in clinical applicability of research. ORTHODONTICS (CHIC) 2012;13:192199.

Key words: bias, Bland-Altman plots, correlation coefficients, measurement systems, methods of comparison

Full Text PDF File | Order Article

 

 
Get Adobe Reader
Adobe Acrobat Reader is required to view PDF files.
This is a free program available from the Adobe web site.
Follow the download directions on the Adobe web site
to get your copy of Adobe Acrobat Reader.
  © 2014 Quintessence Publishing Co Inc
 

Home | Subscription Services | Books | Journals | Multimedia | Events | Blog
Terms of Use | Privacy Policy | About Us | Contact Us | Advertising | Help | Sitemap | Catalog