data_cad function

Coronary artery disease data

Coronary artery disease data

A cross classified table with observational data from a Danish heart clinic. The response variable is CAD (coronary artery disease, some times called heart attack). data

Format

A data frame with 236 observations on the following 14 variables.

  • Sex: Sex; a factor with levels Female Male

  • AngPec: Angina pectoris (chest pain attacks); a factor with levels Atypical None Typical

  • AMI: Acute myocardic infarct; a factor with levels Definite NotCertain

  • QWave: A reading from an electrocardiogram; a factor with levels No Yes; Yes means pathological and is a sign of previous myocardial infarction.

  • QWavecode: a factor with levels Nonusable

     `Usable`. An assesment of whether QWave is reliable.

  • STcode: a factor with levels Nonusable Usable. An assesment of whether STchange is reliable.

  • STchange: A reading from an electrocardiogram; a factor with levels No Yes. An STchange indicates a blockage of the coronary artery.

  • SuffHeartF: Sufficient heart frequency; a factor with levels No, Yes

  • Hypertrophi: a factor with levels No, Yes. Hypertrophy refers to an increased size of the heart muscle due to exercise.

  • Hyperchol: a factor with levels No Yes. Hypercholesterolemia, also called high cholesterol, is the presence of high levels of cholesterol in the blood.

  • Smoker: Is the patient a smoker; a factor with levels No, Yes.

  • Inherit: Hereditary predispositions for CAD; a factor with levels No, Yes.

  • Heartfail: Previous heart failures; a factor with levels No Yes

  • CAD: Coronary Artery Disease; a factor with levels No Yes

data(cad1)

Details

Notice that data are collected at a heart clinic, so data do not represent the population, but are conditional on patients having ended up at the clinic.

  • cad1: Complete dataset, 236 cases.
  • cad2: Incomplete dataset, 67 cases. Information on (some of) the variables 'Hyperchol', 'Smoker' and 'Inherit' is missing.

Examples

data(cad1)
## maybe str(cad1) ; plot(cad1) ...

References

Hansen, J. F. (1980). The clinical diagnoisis of ichaeme heart disease du to coronary artery disease. Danish Medical Bulletin

Højsgaard, Søren and Thiesson, Bo (1995). BIFROST - Block recursive models Induced From Relevant knowledge, Observations and Statistical Techniques. Computational Statistics and Data Analysis, vol. 19, p. 155-175

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