heart {robustbase} | R Documentation

## Heart Catherization Data

### Description

This data set was analyzed by Weisberg (1980) and Chambers et al. (1983). A catheter is passed into a major vein or artery at the femoral region and moved into the heart. The proper length of the introduced catheter has to be guessed by the physician. The aim of the data set is to describe the relation between the catheter length and the patient's height (X1) and weight (X2).

This data sets is used to demonstrate the effects caused by collinearity. The correlation between height and weight is so high that either variable almost completely determines the other.

### Usage

    data(heart)

### Format

A data frame with 12 observations on the following 3 variables.

`height`

  Patient's height in inches

`weight`

  Patient's weights in pounds

`clength`

  Y: Catheter Length (in centimeters)

### Note

There are other `heart` datasets in other R packages, notably survival, hence considering using `package = "robustbase"`, see examples.

### Source

Weisberg (1980)

Chambers et al. (1983)

P. J. Rousseeuw and A. M. Leroy (1987) Robust Regression and Outlier Detection; Wiley, p.103, table 13.

### Examples

    data(heart, package="robustbase")
    heart.x <- data.matrix(heart[, 1:2]) # the X-variables
    plot(heart.x)
    covMcd(heart.x)
    summary( lm.heart <-     lm(clength ~ . , data = heart))
    summary(lts.heart <- ltsReg(clength ~ . , data = heart))

[Package robustbase version 0.93-4 Index]