Glacial             package:compositions             R Documentation

_C_o_m_p_o_s_i_t_i_o_n_s _a_n_d _t_o_t_a_l _p_e_b_b_l_e _c_o_u_n_t_s _o_f _9_2 _g_l_a_c_i_a_l _t_i_l_l_s

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

     In a pebble analysis of glacial tills, the total number of pebbles
     in each of 92 samples was counted and the pebbles were sorted into
     four categories red sandstone,  gray sandstone, crystalline and
     miscellaneous. The percentages of these four categories and the
     total pebble counts are recorded.

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

     data(Glacial)

_D_e_t_a_i_l_s:

     Percentages by weight in 92 samples of pebbles of glacial tills
     sorted  into four categories, red sandstone,  gray sandstone,
     crystalline and miscellaneous. The percentages of these four
     categories and the total pebbles counts are recorded. The
     glaciologist is interested in describing the pattern of
     variability of his data and whether the compositions are in any
     way related to abundance. All rows sum to 100, except for some
     rounding errors.

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

     Aitchison: CODA microcomputer statistical package, 1986, the file
     name GLACIAL.DAT, here included under the GNU Public Library
     Licence Version 2 or newer.

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

     Aitchison: The Statistical Analysis of Compositional Data, 1986,
     Data 18, pp21.

