What Is an Intracluster Correlation Coefficient? Crucial Concepts for Primary Care Researchers

Previous presentations: This work was presented by Dr. Shersten Kil-lip on December 6, 2002, at the Primary Care Research Methods and Statistics Conference in San Antonio, Tex, and on March 22, 2003, at the 2003 Convocation of Practices (hosted by the AAFP National Network for Family Practice and Primary Care Research and the Federation of Practice-Based Research Networks) in Arlington, Va. Both presentations were under the title “What Is an Intracluster Correlation Coefficient? Crucial Concepts for Novice PBRN Researchers.”