part of is about is_specified_input_of data visualization dichotomous variable r2 measure of linkage desequilibrium 2 Alejandra Gonzalez-Beltran Orlaith Burke Philippe Rocca-Serra R squared measure of LD http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2580747/ r2 is a correlation coefficient which is computed over the frequency of 2 dichotomous variable and is used as a measure of Linkage Disequilibrium and as input data item to the creation of an LD plot r2 measure of LD correlation coefficient LD plot ready for release