Longley's Economic Regression Data
A macroeconomic data set which provides a well-known example for a
highly collinear regression.
A data frame with 7 economical variables, observed yearly from 1947 to
GNP implicit price deflator (1954=100)
Gross National Product.
number of unemployed.
number of people in the armed forces.
≥ 14 years of age.
the year (time).
number of people employed.
lm(Employed ~ .) is known to be highly
J. W. Longley (1967)
An appraisal of least-squares programs from the point of view of the
Journal of the American Statistical Association 62,
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
The New S Language.
Wadsworth & Brooks/Cole.
## 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))