## Education Expenditure Data

### Description

Education Expenditure Data, from Chatterjee and Price (1977,
p.108). This data set, representing the education expenditure
variables in the 50 US states, providing an interesting example of
heteroscedacity.

### Usage

data(education, package="robustbase")

### Format

A data frame with 50 observations on the following 6 variables.

`State`

State

`Region`

Region (1=Northeastern, 2=North central, 3=Southern, 4=Western)

`X1`

Number of residents per thousand residing in urban areas in 1970

`X2`

Per capita personal income in 1973

`X3`

Number of residents per thousand under 18 years of age in 1974

`Y`

Per capita expenditure on public education in a
state, projected for 1975

### Source

P. J. Rousseeuw and A. M. Leroy (1987)
*Robust Regression and Outlier Detection*;
Wiley, p.110, table 16.

### Examples

data(education)
education.x <- data.matrix(education[, 3:5])
summary(lm.education <- lm(Y ~ Region + X1+X2+X3, data=education))
## See example(lmrob.M.S) # for how robust regression is used