azcabgptca

Description

Random subset of the 1991 Arizona Medicare data for patients hospitalized subsequent to undergoing a CABG (DRGs 106, 107) or PTCA (DRG 112) cardiovascular procedure.

Usage

data(azcabgptca)

Format

A data frame with 1959 observations on the following 6 variables.

died

systolic blood pressure of subject

procedure

1=CABG; 0=PTCA

gender

1=male; 0=female

age

age of subject

los

hospital length of stay

type

1=emerg/urgent; 0=elective

Details

azcabgptca is saved as a data frame.

Source

Hilbe, Negative Binomial Regression, 2nd ed, Cambridge Univ Press

References

Hilbe, Joseph M (2014), Modeling Count Data, Cambridge University Press

Examples

data(azcabgptca); attach(azcabgptca)
table(los); table(procedure, type); table(los, procedure)
summary(los)
summary(c91a <- glm(los ~ procedure+ type, family=poisson, data=azcabgptca))
modelfit(c91a)
summary(c91b <- glm(los ~ procedure+ type, family=quasipoisson, data=azcabgptca))
modelfit(c91b)
library(sandwich)
sqrt(diag(vcovHC(c91a, type="HC0")))