

   SSuurrvviivvaall ffrroomm MMaalliiggnnaanntt MMeellaannoommaa

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

       time: Survival time in days since the operation, possi-
             bly censored.

     status: The patients status at the end of the study. 1
             indicates that they had died from melanoma, 2
             indicates that they were still alive and 3 indi-
             cates that they had died from causes unrelated to
             their melanoma.

        sex: The patients sex; 1=male, 2=female.

        age: Age in years at the time of the operation.

       year: Year of operation.

   thickness: Tumour thickness in mm.

      ulcer: Indicator of ulceration; 1=present, 0=absent.

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

        The `melanoma' data frame has 205 rows and 7 columns.

        The data consist of measurements made on patients with
        malignant melanoma.  Each patient had their tumour
        removed by surgery at the Department of Plastic
        Surgery, University Hospital of Odense, Denmark during
        the period 1962 to 1977.  The surgery consisted of com-
        plete removal of the tumour together with about 2.5cm
        of the surrounding skin.  Among the measurements taken
        were the thickness of the tumour and whether it was
        ulcerated or not.  These are thought to be important
        prognostic variables in that patients with a thick
        and/or ulcerated tumour have an increased chance of
        death from melanoma.  Patients were followed until the
        end of 1977.

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

        This data frame contains the following columns:

   NNOOTTEE::

        This dataset is not related to the dataset in the
        `trellis' library with the same name.

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

        The data were obtained from

        Andersen, P.K., Borgan, O., Gill, R.D. and Keiding, N.
        (1993) Statistical Models Based on Counting Processes.
        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.

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

