

   LLoonngglleeyy''ss RReeggrreessssiioonn DDaattaa

        data(longley)

   FFoorrmmaatt::

        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 Producr.
          Unemployed:       number of unemployed
          Armed.Forces:     number of .. 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.

   SSoouurrccee::

        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.

   EExxaammpplleess::

        # give the data set in the form it is used in S-plus:
        data(longley)
        longley.x <- data.matrix(longley[, 1:6])
        longley.y <- longley[, "Employed"]

