fretsheads                package:SIN                R Documentation

_F_r_e_t_s' _H_e_a_d_s

_D_e_s_c_r_i_p_t_i_o_n:

     Head measurements on the first an the second adult son in a sample
     of 25 families. The 4 variables are:

        *  head length (first son),

        *  head breadth (first son),

        *  head length (second son),

        *  head breadth (second son).

_U_s_a_g_e:

     data(fretsheads)

_F_o_r_m_a_t:

     A list providing a summary of the data. The list contains:

       'fretsheads$means'   :  the mean vector,
       'fretsheads$stddev'  :  the vector of standard deviations,
       'fretsheads$corr'    :  the correlation matrix, and
       'fretsheads$n'       :  the sample size.

_S_o_u_r_c_e:

     Mardia, K.V., Kent, J.T. & Bibby, J.M.  (1979) _Multivariate
     analysis_. London: Academic Press. (See p.121). 

      Whittaker, J. (1990) _Graphical models in applied multivariate
     statistics_. Chichester: Wiley. (See p.265).

_E_x_a_m_p_l_e_s:

     data(fretsheads)
     fretsheads$means
     fretsheads$stddev
     fretsheads$corr
     fretsheads$n

