TY  - RPRT
TI  - Power analyses for correlations from clustered study designs.
AU  - X M Tu
AU  - J Kowalski
AU  - P Crits-Christoph
AU  - R Gallop
PY  - 2006
DO  - 10.1002/sim.2273
UR  - https://pubmed.ncbi.nlm.nih.gov/16025545/
ID  - 16025545
ER  -