

   GGeenneettiicc LLiinnkkss ttoo LLeefftt--hhaannddeeddnneessss

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

       dnan: The genetic measurement on each woman's DNA.

       hand: The measure of left-handedness on an integer scale
             from 1 to 8.

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

        The `claridge' data frame has 37 rows and 2 columns.

        The data are from an experiment which was designed to
        look for a relationship between a certain genetic char-
        acteristic and handedness.  The 37 subjects were women
        who had a son with mental retardation due to inheriting
        a defective X-chromosome.  For each such mother a
        genetic measurement of their DNA was made.  Larger val-
        ues of this measurement are known to be linked to the
        defective gene and it was hypothesized that larger val-
        ues might also be linked to a progressive shift away
        from right-handednesss.  Each woman also filled in a
        questionnaire regarding which hand they used for vari-
        ous tasks.  From these questionnaires a measure of hand
        preference was found for each mother.  The scale of
        this measure goes from 1, indicating someone who always
        favours their right hand, to 8, indicating someone who
        always favours their left hand. Between these two
        extremes are people who favour one hand for some tasks
        and the other for other tasks.

   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 kindly made available by Dr. Gordon S.
        Claridge from the Department of Experimental Psychol-
        ogy, University of Oxford.

   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.

