TY  - RPRT
TI  - Improved hypothesis testing for coefficients in generalized estimating equations with small samples of clusters.
AU  - Daniel F McCaffrey
AU  - Robert M Bell
PY  - 2006
DO  - 10.1002/sim.2502
UR  - https://pubmed.ncbi.nlm.nih.gov/16456895/
ID  - 16456895
ER  -