Dose response calculation for binomial regression models
PD( model, intercept = 1, slope = 2, prob = NULL, x, level = 0.5, ci.level = 0.95, vcov, family, EB = NULL )
model  Model object or vector of parameter estimates 

intercept  Index of intercept parameters 
slope  Index of intercept parameters 
prob  Index of mixture parameters (only relevant for

x  Optional weights length(x)=length(intercept)+length(slope)+length(prob) 
level  Probability at which level to calculate dose 
ci.level  Level of confidence limits 
vcov  Optional estimate of variance matrix of parameter estimates 
family  Optional distributional family argument 
EB  Optional ratio of treatment effect and adverse effects used to find optimal dose (regretfunction argument) 
Klaus K. Holst