Optimized probability sampling of study sites to improve generalizability in a multisite intervention trial.
Kraschnewski JL, Keyserling TC, Bangdiwala SI, Gizlice Z, Garcia BA, Johnston LF, Gustafson A, Petrovic L, Glasgow RE, Samuel-Hodge CD. Optimized probability sampling of study sites to improve generalizability in a multisite intervention trial. Prev Chronic Dis. 2010 Jan; 7(1):A10.