# longley

##### Longley's Economic Regression Data

A macroeconomic data set which provides a well-known example for a highly collinear regression.

- Keywords
- datasets

##### Usage

`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 Product.

`Unemployed`

number of unemployed.

`Armed.Forces`

number of people in the armed forces.

`Population`

‘noninstitutionalized’ population \(\ge\) 14 years of age.

`Year`

the year (time).

`Employed`

number of people employed.

The regression `lm(Employed ~ .)`

is known to be highly
collinear.

##### References

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
*The New S Language*.
Wadsworth & Brooks/Cole.

##### Examples

`library(datasets)`

```
# NOT RUN {
require(stats); require(graphics)
## give the data set in the form it is used in S-PLUS:
longley.x <- data.matrix(longley[, 1:6])
longley.y <- longley[, "Employed"]
pairs(longley, main = "longley data")
summary(fm1 <- lm(Employed ~ ., data = longley))
opar <- par(mfrow = c(2, 2), oma = c(0, 0, 1.1, 0),
mar = c(4.1, 4.1, 2.1, 1.1))
plot(fm1)
par(opar)
# }
```

*Documentation reproduced from package datasets, version 3.6.1, License: Part of R 3.6.1*

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