

   CCeemmeenntt CCoommppoossiittiioonn DDaattaa

   AArrgguummeennttss::

         x1: The percentage by weight of tricalcium aluminate
             in the sample.

         x2: The percentage by weight of tricalcium silictate
             in the sample.

         x3: The percentage by weight of tricalcium alumino
             ferrite in the sample.

         x4: The percentage by weight of dicalcium silictate in
             the sample.

          y: The heat (in calories per gramme of cement)
             evolved while the sample was setting.

   SSUUMMMMAARRYY::

        The `cement' data frame has 13 rows and 5 columns.

        13 samples of Portland cement were set. For each sam-
        ple, the percentages of the four main chemical ingredi-
        ents was accurately measured.  While the cement was
        setting the amount of heat evolved was also measured.

   DDAATTAA DDEESSCCRRIIPPTTIIOONN::

        This data frame contains the following columns:

   SSOOUURRCCEE::

        The data were obtained from

        Woods, H., Steinour, H.H. and Starke, H.R. (1932)
        Effect of composition of Portland cement on heat
        evolved during hardening.  Industrial Engineering and
        Chemistry, 24, 1207-1214.

   OOTTHHEERR RREEFFEERREENNCCEESS::

        Davison, A.C. and Hinkley, D.V. (1997) Bootstrap Meth-
        ods and Their Application. Cambridge University Press.

        Venables, W.N. and Ripley, B.D. (1994) Modern Applied
        Statistics with S-Plus. Springer-Verlag.

