[R] concordance correlation coefficient using R

Bruno Falissard falissard_b at wanadoo.fr
Sun Dec 7 17:05:18 CET 2008

You can look at the fonction icc in the package psy.
Best regards,

Bruno Falissard
"Paris Sud Innovation Group in Adolescent Mental Health"
Maison de Solenn
97 Boulevard de Port Royal
75679 Paris cedex 14, France
tel : (+33) 6 81 82 70 76
fax : (+33) 1 58 41 28 43
web site : http://perso.wanadoo.fr/bruno.falissard/

-----Message d'origine-----
De : r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] De
la part de paul murima
Envoyé : dimanche 7 décembre 2008 16:23
À : r-help at r-project.org; r-help at stat.math.ethz.ch
Objet : [R] concordance correlation coefficient using R

I have data which i would want to assess the degree of  agreement
between two assays, e.g., to evaluate reproducibility or for
inter-rater reliability. I have used the  Pearson product-moment
correlation coefficient. It looks good ranginging between 0.90 to
0.998. Though this looks good. I am told the Concordance correlation
coefficient will give a better picture of how reproducible the assay
Does any one know how to run such a test using R? If so can you kindly
provide the code, and bit of explanations to spruce it up?

Thank you


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