## Longley's Regression Data

## Usage

    data(longley)

## Format

A data.frame with 7 economical variables, observed yearly from 1947 to 1962 (n=16).

GNP.deflator: | GNP implicit price deflator (1954=100)
GNP : | Gross National Producr.
Unemployed : | number of unemployed
Armed.Forces: | number of .. in the armed forces
Population : | `noninstitutionalized' population
| >= 14 years of age.
Year : | the year (time).
Employed : | number of people employed.

The regression lm(Employed ~ .) is known to be highly collinear.

## Source

J. W. Longley (1967). An appraisal of least-squares programs from the point of view of the user. Journal of the American Statistical Association 62, 819-841.

## Examples

    # give the data set in the form it is used in S-plus:
    data(longley)
    longley.x <- data.matrix(longley[,1:6])
    longley.y <- longley[,"Employed"]

[Package Contents]