Retinopathy

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Description

The retinopathy data contains information on persons with retinopathy.

Usage

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Format

A data frame with 613 observations on the following 5 variables.

RET

RET=1: no retinopathy, RET=2 nonproliferative retinopathy, RET=3 advanced retinopathy or blind

SM

SM=1: smoker, SM=0: non-smoker

DIAB

diabetes duration in years

GH

glycosylated hemoglobin measured in percent

BP

diastolic blood pressure in mmHg

References

Bender and Grouven (1998), Using binary logistic regression models for ordinal data with non-proportional odds, J. Clin. Epidemiol., 51, 809–816.

Examples

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 ## Not run: 
## look for
vignette("ordinal-retinopathy1")
vignette("ordinal-retinopathy2")
 
## End(Not run)