BJR
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Services
Right arrow Related articles in BJR
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 Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Halligan, S
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Halligan, S

Reproducibility, repeatability, correlation and measurement error

S Halligan

Intestinal Imaging Centre, St. Mark's Hospital, London, UK



View larger version (10K):

[in a new window]
  		Figure 1. Scatter graph of four datasets of repeated measurements. The first measurement is 10, 20, 30, 40, 50 in all cases. In dataset A ({blacksquare}) the second measurement equals the first, in dataset B ({blacktriangleup}) the second measurement is exactly twice the first, in dataset C ({blacktriangledown}) the second measurement is exactly one-tenth the first and in dataset D ({blacklozenge}) the second measurement is exactly ten-times the first. In all cases, Pearson's correlation coefficient (r) is 1.

 




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
BJR DMFR IMAGING  ALL BIR JOURNALS 
Copyright © 2002 by the British Institute of Radiology.