Interesting article: Correlation coefficients in medical research: from product moment correlation to the odds ratio. H. C. Kraemer. Stat Methods Med Res 2006: 15(6); 525-45. [Medline] [PDF] Description: There are several measures of agreement (such as the phi coefficient, the point biserial correlation, and the tetrachoric correlation) that are used to show relationships when one or both variables are binary. This paper shows the interrelationships and the interpretation of these correlations and relates them to other measures not traditionally thought of as measures of correlation, such as the odds ratio. The description of this article was written on 2007-07-27, 2008-01-12. Category: Interesting articles, Category: Measuring agreement