skulls                 package:ade4                 R Documentation

_M_o_r_p_h_o_m_e_t_r_i_c _E_v_o_l_u_t_i_o_n

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

     This data set gives four anthropometric measures of 30 egyptean 
     skulls belonging to five different historical periods.

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

     data(skulls)

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

     The 'skulls' data frame has 150 rows and 4 columns. The
     measurements are made on 5 groups and 30 Egyptian skulls. The
     groups are defined as follows :
      1 - the early predynastic period (circa 4000 BC)
      2 - the late predynastic period (circa 3300 BC)
      3 - the 12th and 13th dynasties (circa 1850 BC)
      4 - the Ptolemiac period (circa 200 BC)
      5 - the Roman period (circa 150 BC)

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

     Thompson, A. and Randall-Maciver, R. (1905) _Ancient races of the
     Thebaid_, Oxford University Press.

_R_e_f_e_r_e_n_c_e_s:

     Manly, B.F. (1994) _Multivariate Statistical Methods. A primer_, 
     Second edition. Chapman & Hall, London. 1-215.
      The example is treated pp. 6, 13, 51, 64, 72, 107, 112 and 117.

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

     data(skulls)
     pca1 <- dudi.pca(skulls, scan = FALSE)
     fac <- gl(5, 30)
     levels(fac) <- c("-4000", "-3300", "-1850", "-200", "+150")
     dis.skulls <- discrimin(pca1, fac, scan = FALSE)
     plot(dis.skulls, 1, 1)

