

   SSuurrvviivvaall TTiimmeess aanndd WWhhiittee BBlloooodd CCoouunnttss ffoorr LLeeuukkaaeemmiiaa PPaattiieennttss

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

        wbc: White blood cell count.

         ag: Factor describing the patients group according to
             the test described above.  Levels are `present'
             and `absent'.

       time: Survival time in weeks after diagnosis.

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

        The `leuk' data frame has 33 rows and 3 columns.

        Survival times are given for 33 patients who died from
        acute myelogenous leukaemia.  Also measured was the
        patient's white blood cell count at the time of diagno-
        sis.  The patients were also factored into 2 groups
        according to the presence or absence of a morphologic
        characteristic of white blood cells.  Patients termed
        AG positive were identified by the presence of Auer
        rods and/or  significant granulation  of the leukaemic
        cells in the bone marrow at the time of diagnosis.

   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

        Feigl, P. and Zelen, M. (1965) Estimation of exponen-
        tial survival probabilities with concomitant informa-
        tion. Biometrics, 21, 826-838.

   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.

