claridge                package:boot                R Documentation

Genetic Links to Left-handedness

Description:

     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 characteristic 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
     values of this measurement are known to be linked to the defective
     gene and it was hypothesized that  larger values 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 various 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.

Usage:

     claridge

Format:

     This data frame contains the following columns:


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

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

Source:

     The data were kindly made available by Dr. Gordon S. Claridge from
     the Department of Experimental Psychology, University of Oxford.

References:

     Davison, A.C. and Hinkley, D.V. (1997)  _Bootstrap Methods and
     Their Application_. Cambridge University Press.

