

   UUrriinnee AAnnaallyyssiiss DDaattaa

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

          r: Indicator of the presence of calcium oxalate crys-
             tals.

    gravity: The specific gravity of the urine.

         ph: The pH reading of the urine.

       osmo: The osmolarity of the urine. Osmolarity is propor-
             tional to the concentration of molecules in solu-
             tion.

       cond: The conductivity of the urine.  Conductivity is
             proportional to the concentration of charged ions
             in solution.

       urea: The urea concentration in millimoles per litre.

       calc: The calcium concentration in millimoles per litre.

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

        The `urine' data frame has 79 rows and 7 columns.

        79 urine specimens were analyzed in an effort to deter-
        mine if certain physical characteristics of the urine
        might be related to the formation of calcium oxalate
        crystals.

   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

        Andrews, D.F. and Herzberg, A.M. (1985) Data: A Collec-
        tion of Problems from Many Fields for the Student and
        Research Worker. Springer-Verlag.

   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.

