Simpson's Paradox
Definition of Simpson Paradox
References
Cates, C. J. (2002). Simpson's paradox and calculation of number needed to treat from meta-analysis. BMC Med Res Methodol, 2, 1.
Kunisaki, K. (2005). Simpson's paradox. Crit Care Med, 33(7), 1673-1674; author reply 1674.
Tu, Y. K., Gunnell, D., & Gilthorpe, M. S. (2008). Simpson's Paradox, Lord's Paradox, and Suppression Effects are the same phenomenon - the reversal paradox. Emerg Themes Epidemiol, 5, 2.
-- MaryB - 30 Mar 2009