Utility function.
The model fitted assumes a piecewise constant intensity for the baseline, and that the covariates act additively on the rate scale.
1 2 
y 
Binary vector of outcomes 
rates.frame 
Dataframe expanded from the original data by

cov.frame 
do., but covariates corresponding to the

start 
Starting values for the rate parameters. If not supplied, then starting values are generated. 
A list with one component:
rates 
A glm object from a binomial model with loglink function. 
Martyn Plummer, plummer@iarc.fr
B Carstensen: Regression models for interval censored survival data: application to HIV infection in Danish homosexual men. Statistics in Medicine, 15(20):21772189, 1996.
CP Farrington: Interval censored survival data: a generalized linear modelling approach. Statistics in Medicine, 15(3):283292, 1996.
1 2  data( HIV.dk )

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