| longley | R Documentation |
A macroeconomic data set which provides a well-known example for a highly collinear regression.
longley
A data frame with 7 economical variables, observed yearly from 1947 to 1962 (n=16).
GNP.deflatorGNP implicit price deflator (1954=100)
GNPGross National Product.
Unemployednumber of unemployed.
Armed.Forcesnumber of people in the armed forces.
Population‘noninstitutionalized’ population ≥ 14 years of age.
Yearthe year (time).
Employednumber of people employed.
The regression lm(Employed ~ .) is known to be highly
collinear.
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.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
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)
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