pub fn longley() -> Result<DataFrame, PolarsError>Expand description
§Longley’s Economic Regression Data
§Description:
A macroeconomic data set which provides a well-known example for a highly collinear regression.
§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 >= 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.
§References:
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
§Examples:
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)