

   TThhee EEffffeecctt ooff VViittaammiinn CC oonn TTooootthh GGrroowwtthh iinn GGuuiinneeaa PPiiggss

        data(pigs)

   FFoorrmmaatt::

        A data frame with 60 observations on 3 variables.

         [,1]      len       numeric      Tooth length
         [,2]      supp      factor       Supplement (VC or OJ).
         [,3]      dose      numeric      Dose in milligrams.

   DDeessccrriippttiioonn::

        The response is the average length of odontoblasts
        (teeth) in each of 10 guinea pigs.  Three dose levels
        0.5, 1, and 2 mg of juice and acid in the juice were
        used.

        This makes no sense - check the original source.

   SSoouurrccee::

        C. I. Bliss (1952).  The Statistics of Bioassay, Aca-
        demic Press.

   RReeffeerreenncceess::

        McNeil, D. R. (1977).  Interactive Data Analysis.  New
        York: Wiley.

