Computer methods and programs in biomedicine
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Comput Methods Programs Biomed · Mar 2013
Estimation of the concordance correlation coefficient for repeated measures using SAS and R.
The concordance correlation coefficient is one of the most common approaches used to assess agreement among different observers or instruments when the outcome of interest is a continuous variable. A SAS macro and R package are provided here to estimate the concordance correlation coefficient (CCC) where the design of the data involves repeated measurements by subject and observer. ⋯ In the case of the VC approach, the linear mixed model output and variance components estimates are also provided. The performance of each function is shown by means of some examples with real data sets.