Estimation of coefficients of individual agreement (CIAs) for quantitative and binary data using SAS and R.


Journal Article

The coefficients of individual agreement (CIAs), which are based on the ratio of the intra- and inter-observer disagreement, provide a general approach for evaluating agreement between two fixed methods of measurements or human observers. In this paper, programs in both SAS and R are presented for estimation of the CIAs between two observers with quantitative or binary measurements. A detailed illustration of the computations, macro variable definitions, input and output for the SAS and R programs are also included in the text. The programs provide estimations of CIAs, their standard errors as well as confidence intervals, for the cases with or without a reference method. Data from a carotid stenosis screening study is used as an example of quantitative measurements. Data from a study involving the evaluation of mammograms by ten radiologists is used to illustrate a binary data example.

Full Text

Duke Authors

Cited Authors

  • Pan, Y; Gao, J; Haber, M; Barnhart, HX

Published Date

  • May 2010

Published In

Volume / Issue

  • 98 / 2

Start / End Page

  • 214 - 219

PubMed ID

  • 20079947

Pubmed Central ID

  • 20079947

Electronic International Standard Serial Number (EISSN)

  • 1872-7565

Digital Object Identifier (DOI)

  • 10.1016/j.cmpb.2009.12.002


  • eng

Conference Location

  • Ireland