

   BBeehhaavviioorraall aanndd PPlluummaaggee CChhaarraacctteerriissttiiccss ooff HHyybbrriidd DDuucckkss

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

    plumage: The index of physical appearance based on the
             plumage of individual ducks.

   behaviour: The index of behavioural characteristics of the
             ducks.

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

        The `ducks' data frame has 11 rows and 2 columns.

        Each row of the data frame represents a male duck who
        is a second generation cross of mallard and pintail
        ducks.  For 11 such ducks a behavioural and plumage
        index were calculated.  These were measured on scales
        devised for this experiment which was to examine
        whether there was any link between which species the
        ducks resembled physically and which they resembled in
        behaviour.  The scale for the physical appearance
        ranged from 0 (identical in appearance to a mallard) to
        20 (identical to a pintail).  The behavioural traits of
        the ducks were on a scale from 0 to 15 with lower num-
        bers indicating closer to mallard-like in behaviour.

   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

        Larsen, R.J. and Marx, M.L. (1986) An Introduction to
        Mathematical Statistics and its Applications (Second
        Edition). Prentice-Hall.

   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.

        Sharpe, R.S., and Johnsgard, P.A. (1966) Inheritance of
        behavioral characters in F2 mallard  x  pintail (Anas
        Platyrhynchos L.  x  Anas Acuta L.)  hybrids.
        Behaviour, 27, 259-272.

