

   ToothGrowth {base}                           R Documentation

   TThhee EEffffeecctt ooff VViittaammiinn CC oonn TTooootthh GGrroowwtthh iinn GGuuiinneeaa PPiiggss

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

        The response is the length of odontoblasts (teeth) in
        each of 10 guinea pigs at each of three dose levels of
        Vitamin C (0.5, 1, and 2 mg) with each of two delivery
        methods (orange juice or ascorbic acid).

   UUssaaggee::

        data(ToothGrowth)

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

        A data frame with 60 observations on 3 variables.

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

   SSoouurrccee::

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

   RReeffeerreenncceess::

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

   EExxaammpplleess::

        data(ToothGrowth)
        coplot(len ~ dose | supp, data = ToothGrowth, panel = panel.smooth,
               xlab = "ToothGrowth data: given is supplement type")

