Statnote 22: Measuring 'agreement'

Anthony Hilton, Richard A. Armstrong

Research output: Contribution to specialist publication or newspaperArticle


If a quantity has been measured by two different methods, the degree of agreement between them should not be tested using Pearson’s correlation coefficient ‘r’. Instead the differences between the two methods should be compared with their mean difference using a Bland and Altman plot. Such a plot illustrates the level of agreement between two methods and enables the degree of bias of one method over the other to be calculated and applied if necessary as a correction factor.
Original languageEnglish
Number of pages2
Specialist publicationMicrobiologist
Publication statusPublished - Sept 2010


  • quantity
  • measuring
  • methods
  • degree of agreement
  • Bland and Altman plot
  • correction factor


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