# Longley dataset¶

## Description¶

The Longley dataset contains various US macroeconomic variables that are known to be highly collinear. It has been used to appraise the accuracy of least squares routines.

## Notes¶

Number of Observations - 16

Number of Variables - 6

Variable name definitions::

TOTEMP - Total Employment
GNPDEFL - GNP deflator
GNP - GNP
UNEMP - Number of unemployed
ARMED - Size of armed forces
POP - Population
YEAR - Year (1947 - 1962)


## Source¶

The classic 1967 Longley Data

http://www.itl.nist.gov/div898/strd/lls/data/Longley.shtml

Longley, J.W. (1967) "An Appraisal of Least Squares Programs for the
Electronic Comptuer from the Point of View of the User."  Journal of
the American Statistical Association.  62.319, 819-41.