PT - JOURNAL ARTICLE AU - Liao, Jason J. Z. AU - Lewis, Jerry W. TI - A Note on Concordance Correlation Coefficient DP - 2000 Jan 01 TA - PDA Journal of Pharmaceutical Science and Technology PG - 23--26 VI - 54 IP - 1 4099 - http://journal.pda.org/content/54/1/23.short 4100 - http://journal.pda.org/content/54/1/23.full SO - PDA J Pharm Sci Technol2000 Jan 01; 54 AB - In this note, we first review some recent developments about measures of agreement, which are often required in medicine and other sciences, with focus on differences between these methods. In the last part, we mention five important concerns when using a newly developed concordance correlation coefficient. Our conclusion is that we need to be especially careful when using existing correlation methods and a new correlation method needs to be developed in the future.