

   TTrraaiinniinngg ddaattaasseett ffoorr ccllaassssiiffiiccaattiioonn

        data(cltrain)

   FFoorrmmaatt::

        Data Frame. Three variables x1, x2 and y. The latter
        indicates class membership.

   DDeessccrriippttiioonn::

        200 observations from a 2 population model. Under popu-
        lation 0, {1,i} has a standard normal distribution, and
        {2,i} = (2-x_{1,i}^2+z_i)/3, where i is also standard
        normal.  Under population 1, {2,i} =
        -(2-x_{1,i}^2+z_i)/3.  The optimal classification
        regions form a checkerboard pattern, with horizontal
        boundary at 2=0, vertical boundaries at 1 = m
        t{2}.

        This is the same model as the cltrain dataset.

