This data set is a cross-tabulation of data on 16949 individuals who experienced a heart attack (ASSENT-2 Investigators, 1999).
There are 4 categorical factors each at 3 levels, together with the number of patients and the number of deaths for each
observed combination of the factors. This data set is useful for illustrating the convergence properties of glm and glm2.
data(heart)A data frame with 74 observations on the following 6 variables.
Deathsnumber of deaths
Patientsnumber of patients
AgeGroupcategorization of the age of the patients
Severityseverity of the heart attack
Delaycategorization of the time from heart attack to treatment
Regiongeographical region in which the patients were treated
The variable AgeGroup groups the age of the patients as follows: 1 = <65 years, 2 = 65-75 years, 3 = >75 years.
The variable Delay groups the time from heart attack onset to treatment as follows: 1 = <2 hours, 2 = 2-4 hours, 3 = >4 hours.
The variable Severity denotes the severity of the heart attack using the Killip class: 1 = least severe (class I), 2 = middle severity (class II), 3 = most severe (class III or IV). The variable Region provides the geographical region in which the patients were treated: 1 = Western countries, 2 = Latin America, 3 = Eastern Europe. This data set is useful for illustrating the convergence properties of glm and glm2; see examples in the help documentation for glm2.
ASSENT-2 Investigators. (1999) Single-bolus tenecteplase compared with front-loaded alteplase in acute myocardial infraction: The ASSENT-2 double-blind randomized trial. Lancet 354, 716-722.