R: Fit an addive excess risk model to interval censored data.

fit.add {Epi} | R Documentation

## Fit an addive excess risk model to interval censored data.

### Description

Utility function.

The model fitted assumes a piecewise constant intensity for the baseline, and that the covariates act additively on the rate scale.

### Usage

      fit.add( y, rates.frame, cov.frame, start )

### Arguments

`y` | Binary vector of outcomes
`rates.frame` | Dataframe expanded from the original data by `expand.data`, cooresponding to covariates for the rate parameters.
`cov.frame` | do., but covariates corresponding to the `formula` argument of `Icens`
`start` | Starting values for the rate parameters. If not supplied, then starting values are generated.

### Value

A list with one component:

`rates` | A glm object from a binomial model with log-link function.

### Author(s)

Martyn Plummer, martyn.plummer@r-project.org

### References

B Carstensen: Regression models for interval censored survival data: application to HIV infection in Danish homosexual men. Statistics in Medicine, 15(20):2177-2189, 1996.

CP Farrington: Interval censored survival data: a generalized linear modelling approach. Statistics in Medicine, 15(3):283-292, 1996.

### See Also

`Icens` `fit.mult`

### Examples

      data( HIV.dk )

[Package Epi version 2.47 Index]