[R] concordance correlation coefficient using R

[Bruno Falissard]

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




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Bruno Falissard
INSERM U669, PSIGIAM
"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/
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-----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


Hi.
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
is.
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

Paul

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