cass2 {twostage} | R Documentation |
This is a pilot dataset from the Coronary Artery Surgery Study (CASS) register (Reilly, 1996). It consists of a random sample of 10 observations from each of the strata defined by different levels of mortality, sex and weight category. The "first-stage" data from which this pilot sample was chosen had 8096 observations. There are ten variables in the pilot dataset (see FORMAT).
The dataset has 118 observations with 10 variables arranged in the
following columns:
Column 1 (Mortality)
The operative mortality of the patients
(0 = Alive, 1 = Dead)
Column 2 (sex)
(0 = Male, 1 = Female)
Column 3 (Categorical Weight)
1 = weight less than 60 kg
2 = weight between 60-70 kg
3 = weight 70 kg or more
Column 4 (weight)
The actual weight (in Kg) of the patients at the time of bypass surgery
Column 5 (age)
Age of patients at the time of bypass surgery
Column 6 (Unstable angina)
The angina status of the patients at the time of bypass surgery
(0 = Stable, 1 = Unstable)
Column 7 (Congestive Heart Failure Score (CHF) score)
Column 8 (Left ventricular end diastolic blood pressure (LVEDBP))
Column 9 (Urgency of Surgery)
(0 = Not urgent, 1 = Urgent)
Column 10 (the auxiliary variables, Z)
Different values describe the different levels of sex and weight
category
1 = Male; weight less than 60 kg
2 = Male; weight between 60-70 kg
3 = Male; weight 70 kg or more
4 = Female; weight less than 60 kg
5 = Female; weight between 60-70 kg
6 = Female; weight 70 kg or more
Vliestra, et.al. (1980)
Reilly,M. 1996. Optimal sampling strategies for two-stage studies. Amer. J. Epidemiol. 143:92-100
Vliestra,R.E.,Frye R.L., Kromnal R.A.,et.al.(1980). Risk factors and angiographic coronary artery disease: a report from the Coronary Artery Surgery Study (CASS). Circulation 62:254-61
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