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.


Copyright
---------

This is public domain.