Dunson, David B. PhD*; Baird, Donna D. PhD†; Colombo, Bernardo PhD‡
From *the Biostatistics Branch and †Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina; and ‡Department of Statistics, University of Padua, Padua, Italy.
Received May 26, 2003. Received in revised form September 3, 2003. Accepted September 11, 2003.
The authors thank Guido Masarotto, Rene Ecochard, Petra Frank-Herrman, Christian Gnoth, and the other principal investigators of the European Study of Daily Fecundability for providing the data and for helpful discussions.
Address reprint requests to: David B. Dunson, PhD, Biostatistics Branch, MD A3-03, National Institute of Environmental Health Sciences, PO Box 12233, Research Triangle Park, NC 27709; e-mail: [email protected].
