Author cocitation analysis and Pearson's r

In their article “Requirements for a cocitation similarity measure, with special reference to Pearson's correlation coefficient,” Ahlgren, Jarneving, and Rousseau fault traditional author cocitation analysis (ACA) for using Pearson's r as a measure of similarity between authors because it fails two tests of stability of measurement. The instabilities arise when r s are recalculated after a first coherent group of authors has been augmented by a...