A follow-up investigation to that given by Clark and Perry (1989, Biometrics 45, 309-316) is presented, giving details for maximum likelihood estimation for the dispersion parameter from a negative ...

Bruzzi et al. (1985, American Journal of Epidemiology 122, 904-914) provided a general logisticmodel-based estimator of the attributable fraction for case-control data, and Benichou and Gail (1990, ...